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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Synthetic approaches to proposed biosynthetic intermediates of the polyether ionophore monensin

Russell, S. T. January 1987 (has links)
No description available.
2

L'utilisation du prémélange Rumensin� chez les vaches laitières : les facteurs influençant son effet sur la production et la composition du lait

Dubuc, Jocelyn January 2007 (has links)
Mémoire numérisé par la Direction des bibliothèques de l'Université de Montréal.
3

Desempenho de bovinos confinados suplementados com diferentes ionóforos / Performance of beef cattle in feedlot supplemented with different ionophores

Oliveira, Marcos Garcia de 07 December 2004 (has links)
O presente trabalho teve como objetivo a avaliação do desempenho de 36 bovinos castrados Nelore confinados durante 100 dias de experimentação. Os tratamentos foram: controle (sem ionóforo), 44 mg de lasalocida/kg de (MS) matéria seca de concentrado e 44 mg de monensina/kg de MS de concentrado. Como fonte de volumoso, foi utilizado feno de Coast-Cross (Cynodon dactylon) na proporção de 30% da MS da dieta total. Não houve efeito da suplementação de monensina e lasalocida sobre as concentrações sangüíneas de glicose e uréia. Após 35 dias de experimento, foi observada redução da ingestão de matéria seca dos animais submetidos ao tratamento com monensina, sendo -6,3% e -5,9% em relação aos animais do grupo controle e aos do tratamento com lasalocida, respectivamente (P<0,05). No que se refere ao demais parâmetros de desempenho, não foram observadas diferenças significativas no ganho médio diário (havendo apenas tendência, onde P<0,1668), eficiência alimentar, rendimento de carcaça, área de olho de lombo e espessura de gordura subcutânea no decorrer do experimento / The present study was conducted to estimate performance of 36 castrated Nelore steers, in feedlot during 100 days of experiment. Treatments were: control (no ionophore), 44 mg of lasalocid/kg of concentrate in dry matter (DM) and 44 mg of monensin/kg of concentrate in DM. As forage, it was used Coast-Cross (Cynodon dactylon) hay, in 30% of total ration. There was not effect of monensin and lasalocid supplementation in blood glucose and urea concentrations. After 35 days of experiment, the dry matter intake decreased in monensin group, with -6,5% and -5,9%, for control and lasalocid groups (P<0,05). For other performance parameters, there were not significant diferences in daily gain (only tendence, with P<0,1668), feed efficiency, carcass dressing percentage, rib eye area and subcutaneous fat thickness through the experiment
4

Desempenho, avaliação ruminal e perfil metabólico sanguíneo de bovinos jovens confinados suplementados com monensina sódica ou anticorpos policlonais /

Millen, Danilo Domingues, 1981- January 2008 (has links)
Orientador: Mário De Beni Arrigoni / Banca: Rafael da Costa Cervieri / Banca: Flávio Augusto Portela Santos / Resumo: Esse estudo, conduzido no confinamento experimental da UNESP - Botucatu, foi realizado para testar anticorpos contra as bactérias ruminais S. bovis e F. necrophorum e várias cepas de bactérias proteolíticas sobre o desempenho e incidências de paraqueratose ruminal (IPR) e abscesso hepático em bovinos jovens com diferentes graus de sangue Zebu. O delineamento experimental foi inteiramente casualizado em arranjo fatorial 3X2 em parcelas subdivididas com três repetições (4 animais/baia), aonde três grupos genéticos (24 Tri-Cross (TC) - ½ Brangus, ¼ Angus, ¼ Nelore; 24 Canchim (CC) - ⅝ Charolais, ⅜ Nelore e 24 Nelores (NE)) e dois aditivos alimentares (anticorpos policlonais - 10 ml/cabeça/dia (AP) e monensina sódica - 30 mg/kg de dieta (MN)) foram as variáveis estudadas em três períodos de coleta de dados, correspondentes as três dietas com níveis crescentes de concentrado (73, 82 e 85%). Não houve interação (P>0,05) entre os grupos genéticos e os aditivos alimentares estudados. Animais suplementados com AP apresentaram similares (P>0,05) ganho de peso diário (GPD), ingestão de matéria seca em quilos (IMSKG), conversão alimentar (CA) e custo para ganhar um quilo de peso vivo que aqueles suplementados com MN. A ingestão de matéria seca em porcentagem do peso vivo (IMSPV) foi maior (P<0,05) para animais suplementados com AP que aqueles suplementados com MN. As IMSPV e IMSKG foram maiores na dieta de 73% de concentrado (P<0,05) para animais suplementados com AP e não diferiram entre os aditivos alimentares para as outras duas dietas (P>0,05). Conforme as dietas propostas, GPD e IMSPV diminuíram (P<0,05) e CA e IMSKG aumentaram, linearmente, durante o estudo (P<0,05). Animais suplementados com AP apresentarem menor (P=0,09) IPR que àqueles suplementados com MN. TC e CC apresentaram maiores (P<0,05) IMS e GDP e melhor (P<0,05) CA que NE. Rumens de NE mostraram, significativamente (P<0,05), maiores IPR que TC e CC. / Abstract: This study, conducted at the São Paulo State University feedlot, Botucatu Campus, Brazil, was designed to test antibodies against S. bovis, F. necrophorum, and several strains of proteolytic bacteria (RMT) on performance and parakeratosis and liver abscesses incidences of Bos indicus-based types (BIBT). The experiment was designed as a split plot 3X2 factorial scheme, replicated thrice (4 bulls/pen), in which 24 8-mo-old bulls (297 kg) of each of three BIBT: 3-way cross (½ Brangus, ¼ Angus, ¼ Nellore; TC), Canchim (⅝ Charolais, ⅜ Nellore; CC), or Nellore (NE) were fed one of two diets containing either monensin (MO) at 30 mg/kg of diet or RMT at 10 mL/head/d and evaluated in increasing levels of concentrate (73, 82 and 85%). There were no interactions (P>0.05) between breed type and feed additives. Bulls fed RMT had similar (P>0.05) average daily gain (ADG), dry matter intake in kilos (DMIKG), cost to gain one kilo of body weight and feed conversion (FC) as those fed MO. When analyzed as percentage of BW, bulls fed RMT consumed (P<0.05) more feed than those fed MO. DMIKG and DMIBW were higher in 73% concentrate but did not differ in the others two diets evaluated. According to diets offered, ADG and DMIBW were reduced (P<0.05) and DMIKG and FC (P<0.05) were increased as the level of concentrate in the diet got higher. Bulls fed RMT to have lesser (P=0.09) rumen parakeratosis scores than those fed MO. TC and CC had greater (P<0.05) DMI and ADG, and better (P<0.05) FC than NE. Rumens from NE bulls had greater (P<0.05) parakeratosis scores than CC and TC. Just one liver abscess was found in this study what led to conclude as no abscesses incidence. Feeding RMT enhanced intake of Bos indicus-based bulls fed 73% concentrate diet while maintaining rumen health, and permitting performance similar to that of bulls fed monensin. RMT could be an eventual substitute if monensin was really prohibited. / Mestre
5

Desempenho de bovinos confinados suplementados com diferentes ionóforos / Performance of beef cattle in feedlot supplemented with different ionophores

Marcos Garcia de Oliveira 07 December 2004 (has links)
O presente trabalho teve como objetivo a avaliação do desempenho de 36 bovinos castrados Nelore confinados durante 100 dias de experimentação. Os tratamentos foram: controle (sem ionóforo), 44 mg de lasalocida/kg de (MS) matéria seca de concentrado e 44 mg de monensina/kg de MS de concentrado. Como fonte de volumoso, foi utilizado feno de Coast-Cross (Cynodon dactylon) na proporção de 30% da MS da dieta total. Não houve efeito da suplementação de monensina e lasalocida sobre as concentrações sangüíneas de glicose e uréia. Após 35 dias de experimento, foi observada redução da ingestão de matéria seca dos animais submetidos ao tratamento com monensina, sendo -6,3% e -5,9% em relação aos animais do grupo controle e aos do tratamento com lasalocida, respectivamente (P<0,05). No que se refere ao demais parâmetros de desempenho, não foram observadas diferenças significativas no ganho médio diário (havendo apenas tendência, onde P<0,1668), eficiência alimentar, rendimento de carcaça, área de olho de lombo e espessura de gordura subcutânea no decorrer do experimento / The present study was conducted to estimate performance of 36 castrated Nelore steers, in feedlot during 100 days of experiment. Treatments were: control (no ionophore), 44 mg of lasalocid/kg of concentrate in dry matter (DM) and 44 mg of monensin/kg of concentrate in DM. As forage, it was used Coast-Cross (Cynodon dactylon) hay, in 30% of total ration. There was not effect of monensin and lasalocid supplementation in blood glucose and urea concentrations. After 35 days of experiment, the dry matter intake decreased in monensin group, with -6,5% and -5,9%, for control and lasalocid groups (P<0,05). For other performance parameters, there were not significant diferences in daily gain (only tendence, with P<0,1668), feed efficiency, carcass dressing percentage, rib eye area and subcutaneous fat thickness through the experiment
6

Interactions of Dietary Magnesium, Monensin and Potassium in Dairy Cattle

Tebbe, Alexander Wade 07 December 2017 (has links)
No description available.
7

Facteurs de variation et réévaluation des valeurs de référence du profil métabolique chez les bovins laitiers du Québec

Cécyre, Dominique January 2001 (has links)
Mémoire numérisé par la Direction des bibliothèques de l'Université de Montréal.
8

Účinek vybraných antiparazitik na motolice Trichobilharzia regenti / Effect of selected antiparasitic drugs on Trichobilharzia regenti

Lípová, Pavlína January 2012 (has links)
Praziquantel is a drug of choice for the treatment of schistosomiasis caused by human species of the genus Schistosoma. The effect of the drug on avian schistosomes is not completely known. Monensin is a drug used for the treatment of coccidiosis, and its effect on avian schistosomes is unknown. In the thesis, we studied the effect of these drugs on avian schistosome Trichobilharzia regenti. Under in vitro conditions, both drugs were effective after 6 hours of incubation. Praziquantel causes an extensive vacuolization of the whole body, while monensis treatment causes vacuolization of the anterior part of body. Higher concentration of praziquantel causes depolymerization of myofilaments and separation of surface membranes. Monensin did not impair muscles, but caused separation of tegumental layer from the basal membrane. Schistosomula in ducks were not killed by the drugs under in vivo conditions, but the worms were damaged by the drugs. Praziquantel caused vacuolization of the tegument and separation of membranes from the surface. Only vacuolization of the tegument occurred in schistosomula from ducks treated with monensin . No damage to the muscles was observed in the case of both drugs. Histological evaluation of the nerve tissue showed that thero no difference between treated and control duck....
9

Effect of unsaturated fat and monensin on methane and VFA production in vitro

Newby, Steven L January 2010 (has links)
Typescript, etc. / Digitized by Kansas Correctional Industries
10

Facilitated Transport of Antibiotics by Biochar Under Rainfall Simulations

Andrea Jayne Funk (7481834) 17 October 2019 (has links)
From an agronomic perspective, the spreading of manure (sometimes containing antibiotics) onto agricultural fields is beneficial to the soil as a renewable source of fertilizer by increasing organic matter and providing nutrient inputs for crops. However, the use of antibiotics can be excessive, resulting in manures containing residual antibiotics contaminating soils and waterways. Thus, there is a need to improve existing or develop new management practices to minimize the losses of antibiotics from manure entering waterways and groundwater. Biochar is a carbon-rich material produced from the oxygen-free pyrolysis of biomass. Generally, biochars have high surface area and sorb organic compounds and trace metals; thus, it is reasonable to hypothesize that biochars sorb antibiotics. The main goal of this research was to investigate if incorporated biochar to soil facilitates the transport of antibiotics under simulated rainstorm events. The specific objectives were to investigate the losses of surface-applied antibiotics to soils with different (1) application rates of biochar and rainfall intensities, and (2) if the losses were antibiotic type-dependent. <br>

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