Submitted by Izabel Franco (izabel-franco@ufscar.br) on 2016-09-12T18:27:51Z No. of bitstreams: 1 TeseAWAA.pdf: 1989758 bytes, checksum: 3b9bb42707bd9a2782fcc39bd906d77d (MD5) / Approved for entry into archive by Marina Freitas (marinapf@ufscar.br) on 2016-09-13T19:53:13Z (GMT) No. of bitstreams: 1 TeseAWAA.pdf: 1989758 bytes, checksum: 3b9bb42707bd9a2782fcc39bd906d77d (MD5) / Approved for entry into archive by Marina Freitas (marinapf@ufscar.br) on 2016-09-13T19:53:23Z (GMT) No. of bitstreams: 1 TeseAWAA.pdf: 1989758 bytes, checksum: 3b9bb42707bd9a2782fcc39bd906d77d (MD5) / Made available in DSpace on 2016-09-13T19:53:30Z (GMT). No. of bitstreams: 1 TeseAWAA.pdf: 1989758 bytes, checksum: 3b9bb42707bd9a2782fcc39bd906d77d (MD5) Previous issue date: 2015-08-13 / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / The humic substances (HS) are important to aquatic ecosystems. In this study we investigated the kinetics and molecular variations of dissolved fulvic acids (FA) and humic acids (HA) formed from aquatic macrophytes decomposition under aerobic and anaerobic conditions. The results supported the proposition and validation of kinetic models that treated the formation, transformation and mineralization of dissolved SH. Although mineralization and humification are concurrent events, the aerobic condition favored these two processes contributed primarily to HA formation. The detritus showed different mineralization and HS formation potentials. Larger amounts of HS were related to higher carbon content in the detritus and lower mineralization of dissolved organic carbon (DOC). The SH mass loss rates were lower than the refractory fraction of particulate detritus, showing the recalcitrance of dissolved HS. The DOC with higher C/N proportions presented higher coefficient rates. The HS presented similar characteristics regardless of detritus source. However, aerobic conditions favored variation of polysaccharides content in HS, indicating transformation of these compounds. Aerobic conditions favored dissolved HS mineralization and its assimilation by microorganisms. The AH presented higher reactive fraction than FA, and was an important precursor of FA. The FA presented refractory characteristics and formed less HA, indicating that the liginocellulosic compounds of the detritus are the main precursors of HA. / As substâncias húmicas (SH) são de grande importância para os ecossistemas aquáticos. Nesse estudo investigaram-se a cinética e a variação molecular de ácidos fúlvicos (AF) e húmicos (AH) dissolvidos formados da degradação de macrófitas aquáticas, em condições aeróbias e anaeróbias. Os resultados subsidiaram a proposição e validação de modelos cinéticos que trataram da formação, transformação e mineralização das SH dissolvidas. Embora a mineralização e a humificação sejam eventos concorrentes, a condição aeróbia favoreceu esses dois processos e contribuiu, principalmente, com a formação dos AH. Os detritos apresentaram diferentes potencias de mineralização e formação de SH dissolvidas. As maiores quantidades de SH foram relacionadas com o maior teor de carbono no detrito e menor degradação do carbono orgânico dissolvido (COD). Os coeficientes de perda de massa das SH foram inferiores aos da fração refratária particulada dos detritos, evidenciando a recalcitrância das SH dissolvidas. O COD apresentou coeficientes de mineralização maiores nos meios com relações C/N maiores. As SH apresentaram características semelhantes independentemente da origem do detrito. Entretanto, houve variações maiores de polissacarídeos em condição aeróbia, indicando que houve maior transformação desses compostos nessa condição. Os ambientes aeróbios favoreceram a degradação das SH dissolvidas e a incorporação pelos microrganismos. O AH apresentou maior fração reativa que o AF e, por conseguinte, foi indicado como potencial precursor de AF. Os AF apresentaram características mais refratárias e formaram menos AH, indicando que os compostos lignocelulósicos dos detritos foram os principais precursores dos AH.

O lixiviado de aterro sanitário é uma água residuária com elevada concentração de DQO, DBO, amônia, traços de metais pesados e substâncias orgânicas dificilmente biodegradáveis, tais como substâncias húmicas e celulósicas (lignina). Dada essas características, torna-se necessário que ele seja recolhido e devidamente tratado para evitar danos ao meio ambiente e à saúde humana. Uma prática que tem sido adotada por alguns municípios brasileiros é o direcionamento do lixiviado para tratamento consorciado em estações de tratamento de esgoto (ETE). No entanto, são poucos os estudos que avaliam a eficácia desse procedimento. Um dos questionamentos sobre o tratamento biológico diz respeito à remoção do material orgânico dificilmente biodegradável, representado principalmente pelas substâncias húmicas e, dentro dessa classe, destaca-se a fração de ácidos húmicos no lixiviado. Nesse contexto, o presente trabalho teve como objetivo verificar a tratabilidade das soluções contendo lactose, lactose com ácidos húmicos, lactose com 2% em volume de lixiviado de aterro sanitário bruto e lactose com 2% em volume de lixiviado pré-tratado por \"air stripping\", quando submetidas ao tratamento biológico em reatores de lodos ativados em escala de bancada. Assim, buscou-se verificar se essa tecnologia de tratamento é capaz de estabilizar, ainda que parcialmente, compostos orgânicos de difícil biodegradação presentes no lixiviado. A quantificação das substâncias de difícil biodegradação antes e após o tratamento foi realizada pelo método tentativo do \"Equivalente em Ácidos Húmicos\" que se encontra em fase de estudo. Os resultados demonstraram que houve uma remoção parcial dessas substâncias. As análises de espectroscopia na região do infravermelho indicaram que não ocorreu a adsorção dos ácidos húmicos no lodo, o que pode ser uma evidencia de que a redução da concentração dessas substâncias é de fato devida ao seu consumo e não pela precipitação no lodo. Além disso, a adição de 2% em volume do lixiviado não ocasionou redução da população de microrganismos no sistema. / Leachate from sanitary landfills is a type of effluent with high concentrations of COD, BOD, ammonia, heavy metal traces and hardly biodegradable organic compounds such as humic and cellulosic substances (lignin). Thus this effluent needs to be collected and treated in order to prevent damages to the environment and to human health. A common practice in Brazilian cities is to destine the leachate to a sewage treatment plant (STP). However, there are few studies that assess the efficiency of this procedure. One of the questions regarding the biological treatment concerns its efficiency in removing hardly biodegradable organic compounds, represented in the most part by the humic substances, given the high levels of humic acid in the leachate. Within this context, the present study had the objective to verify the treatability of solutions containing lactose, lactose with humic acids, lactose with 2% (in volume) of untreated sanitary landfill leachate, and lactose with 2% of leachate pre-treated by air stripping, submitted to biological treatment in laboratory-scale activated sludge reactors. Thus this paper assessed if such treatment technology can stabilize, even if only partially, the hardly biodegradable organic compounds found in leachate. The quantification of these substances prior to and after treatment was made by using a tentative method called Humic Acids Equivalent, which is still in the phase of studies. The results show that there was a partial removal of these substances. The spectroscopy analyses on the infrared region indicated that there was no adsorption of humic acids onto the sludge, which evidences that the decrease in the levels of these substances was due to their consumption and not precipitation onto the sludge. Also, the addition of 2% of leachate did not reduce the population of microorganisms in the system.

The Diploma thesis deals with humic acids and their ability to adsorb metal ions on their surface. Humic acids are aromatic polycyclic compounds which contain carboxylic and fenolic functional groups on their sidechains. Thanks to these functional groups humic acids can form complexes with metal ions of different stability and assist the partial immobilization of pollutants in the nature. In this thesis, the sorption of Pb2+ and Zn2+ ions on humic acids was studied by relatively new electroanalytic method called galvanostatic stripping chronopotentiometry. Experimental data were described by Freundlich and Langmuir isotherms. The results show that the amount of examined metal ions increases with their increasing concentration. Furthermore it was determined that Pb2+ ions are adsorbed better on humic acids than Zn2+ ions. Both metals are adsorbed better from solution containing only one metal ion than in presence of four metals at the same time (Cd, Cu, Zn and Pb) where the sorption of these metals is not influenced by the presence of other metals.

This thesis deals with bond strength of metal ions in humic gels. Several samples of humic acids were studied to consider influence of samples isolation process and their consequent characteristics on bond strength of metal ions in their complexes. Some functional groups was blocked by methylation at some samples. Amount of active functional groups in individual samples was determined by standard titration methods. Metal ions bound in humic complexes were divided into several fractions by extraction with different reagents (distilled water, 1M MgCl2, 1M HCl and 0,025M NH4EDTA). Two extraction methods were used: sequential and fractional. During the fractional extraction leaching of metal ions always proceeds in single agents from original komplex, whereas during the sequential extraction leaching proceeds gradually in all extraction agents in order according to rising afinity of agents, i.e. bond strength of metal ions in samples. Amount of metal ions in leaches after extractions was analysed by UV-VIS spektrometry.

Presented diploma thesis focuses on the study of diffusion of cupric ions in humic acid hydrogels. A total of eight different hydrogels were prepared by dissolving the humic acids with sodium hydroxide and sodium triphosphate. For the purpose of precipitation and cross linking, hydrochloric acid and chlorides of magnesium, calcium and iron were used during a modified preparation of gels. Different gel-forming interactions were achieved by modifying the preparation of hydrogel systems. The aim of the thesis was to assess the effect of gel preparation procedure on the transport properties of the gels. Therefore, diffusion coeficients were determined for all samples. Two different methods - constant-source diffusion and instantaneous planar source diffusion - were used to assign the diffusion coefficients. Methods differ in source concentrations of cupric ions and are suitable for assessing the impact of the concentration on the diffusion coefficient. Both these methods were based on monitoring temporal evolution of diffusion profiles of cupric ions and on assigning the overall diffusion flow. Copper ions were elected as diffusing medium because of their high affinity and strong binding to humic acids. Measurements show that gels prepared using polyphosphate allow slightly faster diffusion of cupric ions and that the constant-source method provides higher diffusion coefficients in comparison to instantaneous planar source method.

The main aim of this thesis is the utilization of simple diffusion techniques for the study on transport properties of copper ions in the systems containing humic acids with respect to the other parameters, which can affect the process (the structure of diffusion environment, the interactions between transported specie and diffusion matrices, selective blocking of binding sites of humic acids). The first part of experimental works was focused on characterization of studied materials (humic acids, humic sol and humic hydrogel). The main part of the thesis was dealing with the optimization of simple diffusion techniques, which were suitable for the study on transport of copper ions in matrices containing humic acids, taking into account the mutual interactions between studied components in the system. The obtained diffusion characteristics were compared to the data determined using sorption experiments. Consequently, the minor goal of the experimental works of this thesis was also the assessment of the influence of basic physico-chemical parameters of studied materials on transport phenomenon.

Presented diploma thesis focuses on the study of diffusion of cupric ions in humic acid gels. A total of fifth different standards of humic acids and one sample humic acid prepared from same source as in bachelor's thesis, on which this thesis continues, were used for preparation solutions of humic acids. Thereafter, these solutions were used for preparation of agarose hydrogels, which were necessary in following diffusion experiments. The objective of the work was to compare transport properties of humic standards between themselves and then compare standards with humic acid prepared from same source as in bachelor's thesis. Measure, which was used to determine the transport properties, was comparison of effective diffusion coefficients. Method of instantaneous planar source diffusion was used to compare them. This method was based monitoring temporal evolution of diffusion profiles of cupric ions in humic hydrogels. Copper ions were selected as diffusing medium because of their high affinity and strong bonds to humic acids.

This master's thesis is focused on study of transport processes in hydrogels based on humic acids. For this purpose is used methods unsteady diffusion in cuvettes, which was studied the transport of organic dyes, specifically methylene blue and rhodamine 6G, in agarose hydrogel without the addition and with the addition of individual standards humic acids (Leonardite, Elliott Soil, Suwannee River II and Pahokee Peat). This method is based on spectrophotometric monitoring of concentration changes of dyes depending on space of the cuvette and on time. The aim of this thesis was to investigate the effects of interactions between diffusing dye and the particular type of gel to the resultant effective diffusion coefficient of dye. The experiments indicate that the presence of humic acid in the hydrogel greatly affects the transport of selected dyes.

This diploma thesis was focused on study of barrier and transport properties of selected polyelectrolytes in hydrogel matrices by using diffusion techniques. The study of these properties was performed in horizontal diffusion cells where is observed the change in diffusion probe concentration over time. Diffusion experiments were performed on an agarose hydrogel with the addition of alginate, hyaluronic acid, polystyrene sulfonate, humic acids and as a model probe rhodamine 6G was used. Important parts of this thesis are also the methods which characterize the substances and hydrogel matrices such as rheology and potentiometric titration. The main aim of this diploma thesis was to investigate the effect of interactions between passing model dye (rhodamine 6G) and the appropriate gel (agarose + polyelectrolyte) on the fundamental diffusion parameters (effective diffusion coefficient, lag time, etc.).

Einleitung: Bei Milchkühen häufen sich Erkrankungen in der Frühlaktation. Sie gehören zu den wichtigsten Ursachen frühzeitiger Merzung und damit der aktuell unbefriedigenden Nutzungsdauer. Ziele der Untersuchungen: Ziel dieser Arbeit war es, den Stoffwechsel von Milchkühen in der kritischen Übergangszeit vom Trockenstehen zur Laktation (Transitphase) durch drei verschiedene prophylaktische Maßnahmen zu stabilisieren: mittels Huminsäuren Belastungen aus dem Darm einschließlich Endotoxinen zu mindern, mit einem Ammoniumpropionat-Propylenglykol- Gemisch die Energieversorgung zu verbessern sowie mit Dexamethason-21-isonicotinat die Stoffwechselfunktion der Leber zu fördern sowie gleichzeitig Entzündungsprozesse infolge der Kalbung zu hemmen. Materialien und Methoden: Die Untersuchungen wurden in einem sächsischen Bestand an 312 Kühen der Rasse „Holstein Friesian“ randomisiert innerhalb eines Jahres durchgeführt. An jeweils 78 Kühe wurden 300 ml Ammoniumpropionat-Propylenglykol-Gemisch(C3) täglich vom 14. Tag ante partum (a.p.) bis zum 14. Tag post partum (p.p.) oral verabreicht; ebenfalls oral wurden 100 g Huminsäure-Fertigpräparat (HS-FP) bzw. 50 g Huminsäuren-Rohstoff (HS-RS) im selben Zeitraum appliziert, und Dexamethason-21-isonicotinat (DEXA21) wurde einmalig am 1. Tag p.p. intramuskulär in der Dosierung 0,02 mg/kg Körpermasse verabreicht. 78 unbehandelte Kühe dienten als Kontrollgruppe. Die Auswirkungen dieser Maßnahmen auf Gesundheit, Leistung und Stoffwechsel wurden durch klinische Untersuchungen, durch Blutkontrollen am 14. Tag a.p., am 3. und 28. Tag p.p. (Leukozyten, freie Fettsäuren [FFS], Bilirubin, ß-0H-Butyrat[BHB], Glucose, Cholesterol, Creatinkinase [CK], Aspartat-Amino-Transferase [ASAT], Glutamat-Dehydrogenase [GLDH], gamma-Glutaryl-Transferase [GGT], Protein, Albumin, Mg, Fe, Ca, anorganisches Phosphat [Pi], Na, K) sowie durch die Erfassung von Gesundheitsstatus, Milchleistung und Fruchtbarkeit zu bestimmten Zeitpunkten geprüft. Ergebnisse: Die verschiedenen prophylaktischen Maßnahmen hatten keinen signifikanten Einfluss auf Fruchtbarkeits- und Gesundheitsparameter. Bei den absoluten und fettkorrigierten Milchmengen konnten ebenfalls keine statistisch gesicherten Unterschiede zwischen den Versuchsgruppen und der Kontrollgruppe festgestellt werden. Der Milcheiweißgehalt von C3 28 d p.p. sowie der Milchfettgehalt von DEXA21 und C3 100 d p.p. waren signifikant erhöht. Die Ergebnisse der Blutuntersuchungen ergaben hauptsächlich am 3., aber auch am 28. Tag p.p. gesicherte Unterschiede bei wichtigen Stoffwechselparametern wie Glucose, Cholesterol, Bilirubin, Protein, Albumin, Ca, Fe und CK. Die einmalige Gabe von Dexamethason-21-isonicotinat am 1. Tag p.p. hatte den besten Einfluss auf den Leber- und Energiestoffwechsel. In dieser Gruppe waren am 3. Tag p.p. die Glucose-, Bilirubin-, Cholesterol-, Protein, Ca- und Fe-Konzentrationen sowohl gegenüber der KG wie auch gegenüber allen anderen Versuchsgruppen signifikant günstiger. Für die Albumin- und Na-Konzentrationen sowie die CK-Aktivität traf das gegenüber der Kontroll- sowie der C3-Gruppe zu. Der Einsatz der Wirkstoffe mit HS-RS, HS-FP sowie C3 führte ebenfalls zu positiven Effekten auf die Leistung und den Stoffwechsel gegenüber der Kontrollgruppe, jedoch ließen sich diese nur in wenigen Fällen statistisch sichern. Schlussfolgerungen: Die Applikation von Dexamethason-21-isonicotinat einen Tag p.p. stabilisiert signifikant den Stoffwechsel von Kühen nach dem Partus. Gleichartige Effekte auf Milch- und Fruchtbarkeitsleitung sowie die Morbidität konnten nicht gesichert nachgewiesen werden. Für Huminsäure-Rohstoff, Huminsäure-Fertigpräparat sowie Ammoniumpropionat-Propylenglykol-Gemisch waren solche Effekte tendenziell erkennbar, statistisch aber nicht zu sichern. Auch wenn besonders mit Dexamethason-21-isonicotinat der Stoffwechsel in Belastungssituationen kurzfristig stabilisiert werden kann, müssen generell Haltung und Fütterung analysiert sowie Mängel beseitigt werden.:Inhaltsverzeichnis Inhaltsverzeichnis .I Abkürzungsverzeichnis IV 1 Einleitung .......................................................................................... 1 2 Literaturübersicht ............................................................................. 3 2.1 Stoffwechsel der Milchkuh im geburtsnahen Zeitraum ....................... 3 2.2 Bovine Ketose .................................................................................... 5 2.3 Fettmobilisationssyndrom ................................................................... 7 2.4 Möglichkeiten der Stabilisierung des Stoffwechsels der Milchkuh im geburtsnahen Zeitraum ...................................................................... 9 2.4.1 Allgemeines zur Stoffwechselstabilisierung ........................................ 9 2.4.2 Energiereiche C3-Verbindungen ...................................................... 11 2.4.2.1 Propionat .......................................................................................... 12 2.4.2.2 Propylenglykol .................................................................................. 14 2.4.2.3 Ammoniumpropionat-Propylenglykol-Gemisch ................................ 15 2.4.3 Huminsäuren .................................................................................... 16 2.4.3.1 Einsatz, Vorkommen, Aufbau ........................................................... 16 2.4.3.2 Effekte .............................................................................................. 16 2.4.3.3 Wirkungsweise im Organismus ........................................................ 17 2.4.3.4 Anwendungen in der Veterinärmedizin ............................................. 18 2.4.3.5 Huminsäurenpräparate ..................................................................... 20 2.4.4 Glukokortikoide................................................................................. 21 2.4.4.1 Aufbau .............................................................................................. 21 2.4.4.2 Wirkungsweise ................................................................................. 21 2.4.4.3 Effekte .............................................................................................. 22 2.4.4.4 Dexamethason-21-isonicotinat ......................................................... 25 3 Tiere, Material und Methoden ........................................................ 27 3.1 Untersuchte Tiere, Betrieb, Fütterung .............................................. 27 3.2 Versuchsanordnung, Gruppeneinteilung .......................................... 28 3.3 Entnahme, Aufbereitung und Aufbewahrung der Blutproben ........... 30 3.4 Bestimmung der Blutparameter, Referenzbereiche ......................... 31 3.4.1 Bestimmung der Leistungs-, Gesundheits- und Fruchtbarkeitsparameter .................................................................. 33 3.5 Statistische Prüfung der ermittelten Daten ....................................... 35 4 Ergebnisse ...................................................................................... 36 4.1 Methodische Aspekte ....................................................................... 36 4.1.1 Wertung der Untersuchungsergebnisse kranker und selektierter Kühe ................................................................................................ 36 4.1.2 Akzeptanz der verabreichten Futterzusatzstoffe .............................. 37 4.2 Klinische Befunde ............................................................................. 38 4.3 Leistungsparameter .......................................................................... 41 4.3.1 Milchleistung .................................................................................... 41 4.3.2 Fruchtbarkeit .................................................................................... 44 4.4 Labordiagnostische Parameter......................................................... 45 4.4.1 Energie-Fett-Leberstoffwechsel ....................................................... 45 4.4.1.1 Glucose ............................................................................................ 45 4.4.1.2 Cholesterol ....................................................................................... 47 4.4.1.3 Bilirubin ............................................................................................ 48 4.4.1.4 Beta-Hydroxy-Butyrat ....................................................................... 49 4.4.1.5 Freie Fettsäuren ............................................................................... 50 4.4.1.6 Aspartat-Amino-Transferase ............................................................ 51 4.4.1.7 Gamma-Glutamyl-Transferase ......................................................... 52 4.4.1.8 Glutamat-Dehydrogenase ................................................................ 53 4.4.2 Eiweißstoffwechsel ........................................................................... 54 4.4.2.1 Gesamtprotein .................................................................................. 54 4.4.2.2 Albumin ............................................................................................ 55 4.4.3 Mineralstoff- und Spurenelementstoffwechsel .................................. 56 4.4.3.1 Natrium ............................................................................................. 56 4.4.3.2 Kalium .............................................................................................. 57 4.4.3.3 Calcium ............................................................................................ 58 4.4.3.4 anorganisches Phosphat .................................................................. 59 4.4.3.5 Magnesium ....................................................................................... 60 4.4.3.6 Eisen ................................................................................................ 61 4.4.4 Muskelstoffwechsel .......................................................................... 62 4.4.4.1 Kreatinkinase ................................................................................... 62 4.4.5 Leukozyten ....................................................................................... 63 5 Diskussion ...................................................................................... 64 5.1 Klinische Parameter ......................................................................... 64 5.1.1 Morbidität ......................................................................................... 64 5.1.2 Milchleistung .................................................................................... 67 5.1.3 Fruchtbarkeit .................................................................................... 70 5.2 Klinisch-chemische Parameter, Stoffwechsel ................................... 71 5.2.1 Wirkung von Huminsäuren auf den Stoffwechsel ............................. 71 5.2.2 Wirkung einer energiereichen C3-Verbindung auf den Stoffwechsel 71 5.2.3 Wirkung von Dexamethason-21-isonicotinat auf den Stoffwechsel .. 74 6 Zusammenfassung ......................................................................... 83 7 Summary ......................................................................................... 85 8 Literaturverzeichnis ....................................................................... 87 / Problem: In dairy cattle diseases are common in early lactation. They are among the main causes of early culling and the current unsatisfactory productive life. Objective: The aim of this work was to stabilize metabolism of dairy cows in the critical transition period from standing dry to lactation by three different prophylactic applications: using humic acids to minimize strain from the gut including endotoxins, using ammonium propionate mixed with propylene glycol to improve energy supply and dexamethasone-21-isonicotinate to promote metabolic function of the liver and at the same time to inhibit inflammatory processes following parturition. Experimental design: The studies were performed in a Saxon dairy farm on 312 cows of the „Holstein Friesian\" breed, randomly performed within one year. 78 cows were administered orally 300 ml ammonium propionate mixed with propylene glycol (C3) daily from 14 days before parturition (a.p.) to 14 days after parturition (p.p.), another 78 cows 100 g of a humic acid drug (HS-FP) or 50 g of humic acid raw material (HS-RS) were administered orally in the same period and dexamethasone-21-isonicotinate (DEXA21) was applied intramuscularly to another 78 cows on the first day p.p. in a dose of 0.02 mg/kg body weight. 78 untreated cows were used as control group. The impact of these administrations on health, performance and metabolism has been measured by clinical examinations and blood tests on 14. day a.p., on 3. and 28. day p.p. (Leukocytes, free fatty acids [ FFS ], bilirubin, beta-0H-butyrate [BHB] , glucose, cholesterol, creatine kinase [CK], aspartate aminotransferase [AST], glutamate dehydrogenase [GLDH], gamma glutaryl transferase [GGT], protein, albumin, Mg, Fe, Ca, inorganic phosphate [Pi] , Na, K) and was verified by detection of health status, milk yield and fertility. Results: The different prophylactic administrations had no significant effect on fertility and health parameters. The absolute and fat- corrected milk yields also showed no statistically reliable differences between experimental groups and control group. Milk protein content in C3 28 days p.p. and milk fat content in DEXA21 and C3 100 days p.p. were significantly increased. Blood control results showed mainly on 3. and 28. day p.p. important differences in metabolic parameters, such as glucose, cholesterol, bilirubin, protein, albumin, Ca, Fe and CK, which are statistically secured. A single dose of dexamethasone-21- isonicotinate on first day p.p. had the best effect on liver and energy metabolism. Three days p.p. glucose, bilirubin, cholesterol, protein, Ca and Fe concentrations performed significantly better in DEXA21 group compared both to control group and all other treatment groups. For albumin and Na concentrations and CK activity that was true with respect to control and C3 group. The use of a humic acid drug, humic acid raw material and ammonium propionate mixed with propylene glycol had positive impact on performance and metabolism compared with control group too, but could be statistically secured in only a few cases. Conclusions: The application of dexamethasone-21-isonicotinate at the first day p.p. significantly stabilizes metabolism in cows after parturition. Similar effects on milk yield and fertility as well as morbidity could not be observed. For humic acid drug, humic acid raw material and ammonium propionate mixed with propylene glycol such effects tended to be recognizable, but cannot be statistically secured. Metabolism can be stabilized in short term stress situations with dexamethasone-21-isonicotinate, general care and feeding must be analyzed and deficiencies have to be eliminated.:Inhaltsverzeichnis Inhaltsverzeichnis .I Abkürzungsverzeichnis IV 1 Einleitung .......................................................................................... 1 2 Literaturübersicht ............................................................................. 3 2.1 Stoffwechsel der Milchkuh im geburtsnahen Zeitraum ....................... 3 2.2 Bovine Ketose .................................................................................... 5 2.3 Fettmobilisationssyndrom ................................................................... 7 2.4 Möglichkeiten der Stabilisierung des Stoffwechsels der Milchkuh im geburtsnahen Zeitraum ...................................................................... 9 2.4.1 Allgemeines zur Stoffwechselstabilisierung ........................................ 9 2.4.2 Energiereiche C3-Verbindungen ...................................................... 11 2.4.2.1 Propionat .......................................................................................... 12 2.4.2.2 Propylenglykol .................................................................................. 14 2.4.2.3 Ammoniumpropionat-Propylenglykol-Gemisch ................................ 15 2.4.3 Huminsäuren .................................................................................... 16 2.4.3.1 Einsatz, Vorkommen, Aufbau ........................................................... 16 2.4.3.2 Effekte .............................................................................................. 16 2.4.3.3 Wirkungsweise im Organismus ........................................................ 17 2.4.3.4 Anwendungen in der Veterinärmedizin ............................................. 18 2.4.3.5 Huminsäurenpräparate ..................................................................... 20 2.4.4 Glukokortikoide................................................................................. 21 2.4.4.1 Aufbau .............................................................................................. 21 2.4.4.2 Wirkungsweise ................................................................................. 21 2.4.4.3 Effekte .............................................................................................. 22 2.4.4.4 Dexamethason-21-isonicotinat ......................................................... 25 3 Tiere, Material und Methoden ........................................................ 27 3.1 Untersuchte Tiere, Betrieb, Fütterung .............................................. 27 3.2 Versuchsanordnung, Gruppeneinteilung .......................................... 28 3.3 Entnahme, Aufbereitung und Aufbewahrung der Blutproben ........... 30 3.4 Bestimmung der Blutparameter, Referenzbereiche ......................... 31 3.4.1 Bestimmung der Leistungs-, Gesundheits- und Fruchtbarkeitsparameter .................................................................. 33 3.5 Statistische Prüfung der ermittelten Daten ....................................... 35 4 Ergebnisse ...................................................................................... 36 4.1 Methodische Aspekte ....................................................................... 36 4.1.1 Wertung der Untersuchungsergebnisse kranker und selektierter Kühe ................................................................................................ 36 4.1.2 Akzeptanz der verabreichten Futterzusatzstoffe .............................. 37 4.2 Klinische Befunde ............................................................................. 38 4.3 Leistungsparameter .......................................................................... 41 4.3.1 Milchleistung .................................................................................... 41 4.3.2 Fruchtbarkeit .................................................................................... 44 4.4 Labordiagnostische Parameter......................................................... 45 4.4.1 Energie-Fett-Leberstoffwechsel ....................................................... 45 4.4.1.1 Glucose ............................................................................................ 45 4.4.1.2 Cholesterol ....................................................................................... 47 4.4.1.3 Bilirubin ............................................................................................ 48 4.4.1.4 Beta-Hydroxy-Butyrat ....................................................................... 49 4.4.1.5 Freie Fettsäuren ............................................................................... 50 4.4.1.6 Aspartat-Amino-Transferase ............................................................ 51 4.4.1.7 Gamma-Glutamyl-Transferase ......................................................... 52 4.4.1.8 Glutamat-Dehydrogenase ................................................................ 53 4.4.2 Eiweißstoffwechsel ........................................................................... 54 4.4.2.1 Gesamtprotein .................................................................................. 54 4.4.2.2 Albumin ............................................................................................ 55 4.4.3 Mineralstoff- und Spurenelementstoffwechsel .................................. 56 4.4.3.1 Natrium ............................................................................................. 56 4.4.3.2 Kalium .............................................................................................. 57 4.4.3.3 Calcium ............................................................................................ 58 4.4.3.4 anorganisches Phosphat .................................................................. 59 4.4.3.5 Magnesium ....................................................................................... 60 4.4.3.6 Eisen ................................................................................................ 61 4.4.4 Muskelstoffwechsel .......................................................................... 62 4.4.4.1 Kreatinkinase ................................................................................... 62 4.4.5 Leukozyten ....................................................................................... 63 5 Diskussion ...................................................................................... 64 5.1 Klinische Parameter ......................................................................... 64 5.1.1 Morbidität ......................................................................................... 64 5.1.2 Milchleistung .................................................................................... 67 5.1.3 Fruchtbarkeit .................................................................................... 70 5.2 Klinisch-chemische Parameter, Stoffwechsel ................................... 71 5.2.1 Wirkung von Huminsäuren auf den Stoffwechsel ............................. 71 5.2.2 Wirkung einer energiereichen C3-Verbindung auf den Stoffwechsel 71 5.2.3 Wirkung von Dexamethason-21-isonicotinat auf den Stoffwechsel .. 74 6 Zusammenfassung ......................................................................... 83 7 Summary ......................................................................................... 85 8 Literaturverzeichnis ....................................................................... 87