Submitted by Claudia Rocha (claudia.rocha@udesc.br) on 2018-02-16T11:33:10Z No. of bitstreams: 1 PGCA15MA188.pdf: 805761 bytes, checksum: 3028d3d90a220034a61965b15f69dd00 (MD5) / Made available in DSpace on 2018-02-16T11:33:10Z (GMT). No. of bitstreams: 1 PGCA15MA188.pdf: 805761 bytes, checksum: 3028d3d90a220034a61965b15f69dd00 (MD5) Previous issue date: 2015-11-27 / Capes / The aim was to compare Holstein and crossbreds Holstein x Jersey cows regarding to milk yield and composition, physical characteristics of the milk and metabolic profile in the first eight weeks of lactation. The cows were housed individually in a tiestall , with free access to water and ration. The animal diets were formulated to meet 100% of nutritional requirements, and was provided as a total mixed ration (TMR). Milk yield was measured daily. Once a week, milk samples from each cow were collected to realize the composition and somatic cell count(SCC) analysis and on the same day, a milk sample was collected to realize physicochemical analysis. Once a week, body weight and body condition score (BCS) of each animal was measured The metabolic profile analysis; like serum betahidroxibutirato (BHB), cholesterol, aspartate aminotransferase (AST), gamma-glutamyl transferase (GGT), creatine kinase (CK), total protein, albumin, globulin, calcium, phosphorus and magnesium were made from commercials kits. The variables ionic calcium and glucose were performed using the automatic analyzer of pH and blood gases, I-STAT. The data were analyzed with the MIXED procedure of statistical package SAS as repeated measures. The Holstein cows have more milk yield. The higher milk yield was accompanied by higher production of milk corrected for energy and protein (ECM), with a tendency of higher milk yield corrected to 4% fat in Holstein cows. The crossbreed cows showed greater fat, with no difference to the protein content, and the crossbred Holstein x Jersey cows have more solids content in the milk. Holstein cows showed higher protein yield, with no difference between genetic groups for fat yield. There was no difference between the experimental groups for the physical characteristics of milk. There was also no difference between the experimental groups for the variables, milk yield per 100 kg body weight and production of protein per 100 kg body weight, however the 12 13 crossbred cows have higher fat yield by 100 kg of body weight. The Holstein cows were heavier, and there was no difference between the experimental groups for BCS and BHB. There was a tendency of crossbred cows to had less glucose. Serum cholesterol did not differ between the genetic groups. Differences in total protein, albumin, globulin, AST, CK, GGT, total calcium and mAGNEium among genetic groups were not observed. For ionic calcium was observed difference between the genetic group, being higher in crossbred cows. There were differences for phosphorus serum concentration, being higher in Holstein cows / O objetivo foi comparar vacas da raça Holandesa em relação as mestiças Holandês x Jersey quanto a produção e composição do leite, características físicas do leite e perfil metabólico nas oito primeiras semanas de lactação. As vacas foram alojadas de forma individual em instalação do tipo tiestall, com acesso a água e alimento. As dietas dos animais foram formuladas para atender 100% das exigências nutricionais, sendo fornecida dieta totalmente misturada (TMR) no cocho. A produção de leite foi medida diariamente. Semanalmente foram coletadas amostras de leite de cada vaca para realização das análises de composição. Uma amostra de leite de cada ordenha foi coletada para a realização das análises físico-químicas. Semanalmente foi realizada a pesagem dos animais bem como avaliação do escore de condição corporal (ECC). As análises de perfil metabólico; concentração sérica de betahidroxibutirato (BHB), colesterol, aspartato aminotransferase (AST), gama-glutamil-transferase (GGT), creatina quinase (CK), proteína total, albumina, globulina, cálcio total, fósforo e magnésio, foram realizadas a partir de kits comerciais. As variáveis cálcio iônico e glicose foram realizadas utilizando-se analisador automático de pH e gases sanguíneos I-STAT. Os dados foram submetidos à análise de variância pelo procedimento MIXED do pacote estatístico SAS, como medidas repetidas no tempo. As vacas da raça Holandesa produziram mais leite. A maior produção de leite em vacas Holandesas foi acompanhada pela maior produção de leite corrigido para energia (ECM), com tendência de maior produção de leite corrigido para 4% de gordura.. As mestiças apresentaram maior teor de gordura, sem diferença para o teor de proteína, sendo que as vacas mestiças Holandês x Jersey superaram as vacas Holandesas no teor de sólidos no leite. Vacas Holandesas foram superiores para produção de proteína, não havendo diferença entre grupamentos genéticos para produção de gordura . Não houve diferença entre os grupamentos genéticos para as características físicas do leite. Também não houve diferença para as 8 9 variáveis, produção de leite por 100 kg de peso vivo e produção de proteína por 100 kg de peso vivo, entretanto as vacas mestiças foram superiores em produção de gordura por 100 kg de peso vivo . As vacas Holandesas foram mais pesadas , sendo que para ECC e BHB não houve diferença entre os grupamentos genéticos. Houve uma tendência das vacas mestiças possuírem menos glicose . A concentração sérica de colesterol não diferiu entre os grupamentos genéticos . Também não foram observadas diferenças para proteína total, albumina, globulina, AST, CK, GGT, cálcio total e magnésio entre os grupamentos genéticos. O cálcio iônico foi superior nas vacas mestiças em relação às Holandesas e a concentração sérica de fósforo foi superior em vacas Holandesas quando comparadas com mestiças

The diploma thesis is focused on reproduction and milk yield of a herd of Czech Fleckvieh and Red Holstein cattle on Velká Chyška farm. Milk yield together with the reproduction makes a basement of every breeding and its analysing is very useful for the breeder. The aim of the thesis was to split the herd according to the lactation into four groups (1, 2, 3, 4 and more lactations) and according to the percentage of blood of Czech Fleckvieh and Red Holstein cattle into three groups (C1- C 75-100 %, C2- C 51-74 % and R- R 51-100 %). To observe the indicators of milk yield and especially to observe yield in standardized lactation, index of persistence of the lactation line and whole-life yield of these cows. Next, to focus on the reproductive indicators: the insemination interval, the service period and the interval itself. Gathered information was recorded into tables and then statistically evaluated. Also, all groups were mutually compared. Needed information was gathered from GEA Dairy plan program and the milk cow cards. Milk cows, which started the lactation in period from 10. 10. 2014 to 30. 2. 2015, were included into the analyzed group. Generally, 155 pieces of livestock participated here. The milk yield indicators were evaluated as excellent. The groups of cows C1 and C2 cows with dominant percentage of blood of Czech Fleckvieh breed, showed significantly better-than-average results when compared with the yield check. The group with dominant percentage of blood of Red Holstein breed (R) exceeded the results from the yield check of the Czech republic as well, but not as in such extent as in case of C1 and C2 groups. In comparison of the groups together, no statistically important results were found. Statistically, only influence of lactation order to the yield in standardized lactation and also influence of lactation order to the index of persistence of lactation line was proved. Reproductive indicators were different in comparison from the yield; they were on very low levels. The service period and the period itself were evaluated as unsatisfactory in all groups and a problem with reproductive management was proved. In comparison of the groups together, no statistically important differences were found as well. Based on the found results and their analysis, conclusions for the breeding practice came about.

The aim of the work was to elaborate a literary review of the characteristics, reproductive properties of Holstein cattle and influences affecting the reproduction of cattle. Another objective of the work was to evaluate the selected influences on their reproduction in a group of selected dairy cows from the monitored cattle herd. The data were processed and sorted by genotype, level of milk performance, parity, length of dry period, length of insemination interval, difficulty of calving, age of the first calving and synchronization of estrous (Ovsynch). In evaluating the effect of the genotype on reproductive parameters, there were no statistically significant differences between purebred Holstein cows (H100) and crosses (H50-88C). In addition, the effect of milk yield on lactation on reproductive performance was evaluated. The results showed that with increasing performance, the values of reproduction indicators (insemination index, insemination interval and period service) have increased. The statistically lowest insemination index (1.70) and insemination interval (96 days) were detected in cows with a yield up to 8,000 kg. The service period (122 days) was conclusively the lowest in a cow group with a yield of 8,001 to 10,000 kg lactating milk. In contrast, the highest conclusive values of the insemination index, interval and period service were detected in a group of dairy cows with a yield above 12,001 kg of milk. It is further evident from the results that the values of the pregnancy rate after the first insemination increased with the increasing level of milk performance. The lowest value (27.14%) was detected in the group with the highest milk yield (over 12,001 kg of milk). There were no significant differences between the different groups of dairy cows in the evaluation of the influence of parity on the reproduction indicators. Furthermore, the influence of length of dry period was evaluated. The average dry period in the monitored herd was 69 days. The pregnancy rate after the first insemination was better for the group with a dry period over 61 days (40.38%). On the other hand, periods of service and days open values were lower in dairy cows with a dry period less than 60 days (119 and 394 days respectively). The length of uterine involution was also monitored by the length of insemination interval. Most cows in the monitored group of dairy cows (25.29%) were first inseminated 66th - 87th day after calving. No statistically significant differences were detected in the assessment of the age of the 1st calving and the severity of births on reproductive parameters. The use of controlled reproduction methods (Ovsynch) was also monitored and applied only in the case of reproductive disorders of dairy cows. In the monitored period, Ovsynch was used in only 10 dairy cows and the average service period was 140 days.

The aim of this thesis is to evaluate chosen influences on the extent of reproduction of randomly chosen milk cows that are bred in the same conditions. The chosen influences such as breed, age of the first calving, time of year of calving and level of yield were observed within breeds of Czech Fleckvieh and Holstein cattle. Evaluation was carried out in ZOD "Podhradí" Choustník company, specifically in Budislav farm. 191 cows were chosen for the basic sample. 95 of them were Holstein cattle and 96 were Czech mottled cattle. Chosen influences were evaluated according to data gained from the set of milk yield inspections. A statistically significant difference was observed between Czech ticks and Holstein cows in the length of service period per second and first lactation where Holstein cows have a second lactation period longer than 44 days (P <0.001). Evaluation of first calving age did not show any influence on the level of reproduction neither within Czech Fleckvieh nor within Holstein cattle. During the annual evaluation, it emerged that Holstein cows calved in spring and winter have significantly bigger insemination interval compared to cows that were calved during summer or autumn. This fact was also proven by correlation analysis. This analysis also confirmed the relation between annual period and insemination interval Rxy=0,21(P<0,05). The correlation analysis also proved the relation between annual period and service period as well as interim of Czech Fleckvieh cattle Rxy= 0,327 (P<0,01). Statistically significant influence was not proven within Holstein cattle. Correlation analysis only pointed out the relation between yield and service period Rxy=0,213 (P<0,05). Unlike Holstein cattle, gradual increase of service period figures and interim depending on yield was noticed. Breeding cows milking more that 7,5 thousand kg of milk per lactation had service period of 132 days (P<0,01) and interim 407 days (P<0,01). Economical losses caused by prolonged interim during monitored herd of cattle reached 400.490 CZK in year of 2016.

The objective of this study was to evaluate the effect of pasture and pasture vegetation composition on the milk yield and milk fat and protein content in the Czech Fleckvieh cattle kept in the less favorable areas (LFA) during the years 2007 ? 2009. These pasture characteristics were observed: pasture quality defined by the chemical composition of herbage groups, determination and rate of dominant grass types, clover types and herbs and the height of pasture vegetation. Next, the fatty acids spectrum in the milk was analyzed and the effect of forage and grain supplements on the milk fat composition was confirmed.

The evaluation of influence of parity on fatty acids content in milk fat of cows from selected farm and defining of difference between lactations were main topics of this thesis.

This thesis deals with the evaluation of selected influences on the milk production and fertility of dairy cows in a herd of Holstein cattle. The cattle husbandry sector, in recent years, has been facing a worsening of the indicators of reproduction and longevity in dairy cows. It is primarily the requirement of constantly increasing the milk yield of dairy cows that has had an adverse impact on these indicators. The worsening of these indicators can result in a reduction of the cost-effectiveness of the production of milk and meat. The evaluation of influences on milk production and fertility in a herd of Holstein cattle was carried out at the AGRODAM Hořepník s.r.o. company. The selected influences included milk yield quantity, parity, age at first calving, calving interval, insemination index, and conception rate after first insemination. Two hundred and two Holstein dairy cows were included in the monitoring. Data on milk yield and reproduction were obtained from milk yield records and zootechnical records. The results showed that milk production of the monitored group of dairy cows was at a high level (10,025 kg of milk). The highest milk yield in kilograms of milk during first lactation was achieved by dairy cows that calved at the age of 27 to 29 months (9,335 kg of milk). According to the milk yield during the first lactation, the highest milk yield during three lactations was by dairy cows that had a milk yield exceeding 10,000 kg of milk during the first lactation (35,515 kg). When utilizing the DOUBLE OVSYNCH synchronization protocol, the average calving interval was 412 days, and a higher conception rate after first insemination (43%) was found as compared to the nationwide average in the Czech Republic (34.2%). The average number of culled dairy cows was 32%; from this the highest proportion of culled dairy cows was for other medical reasons (31%). Due to low milk yields, 25% of the dairy cows were culled.

Submitted by VANESSA REJANE NOGUEIRA GAVIOLLI null (vanessagaviolli@uol.com.br) on 2016-03-09T14:34:33Z No. of bitstreams: 1 TESE.FINAL.VANESSA.GAVIOLLI.pdf: 1138806 bytes, checksum: c22c11314b95c3ddb9e2b11121799f64 (MD5) / Approved for entry into archive by Juliano Benedito Ferreira (julianoferreira@reitoria.unesp.br) on 2016-03-10T16:21:21Z (GMT) No. of bitstreams: 1 gaviolli_vrn_dr_jabo.pdf: 1138806 bytes, checksum: c22c11314b95c3ddb9e2b11121799f64 (MD5) / Made available in DSpace on 2016-03-10T16:21:21Z (GMT). No. of bitstreams: 1 gaviolli_vrn_dr_jabo.pdf: 1138806 bytes, checksum: c22c11314b95c3ddb9e2b11121799f64 (MD5) Previous issue date: 2016-02-17 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / O objetivo deste estudo foi avaliar o efeito de dietas contendo diferentes fontes protéicas, sobre o consumo de nutrientes, produção e composição química do leite e parâmetros sanguíneos de vacas da raça Holandesa. O trabalho foi desenvolvido no setor de bovinocultura de leite da FCAV/UNESP, Campus de Jaboticabal. Foram avaliadas 05 vacas da raça Holandesa, pesando em média de 560 kg, alocadas conforme a ordem de parição, dias de lactação e nível de produção em quadrado latino 5 x 5. As vacas receberam rações que constituíram os seguintes tratamentos: T1 = silagem de milho (SM) + concentrado comercial 20,85% PB + mistura mineral (M); T2 = SM+ farelo de soja + milho (Mi) +M; T3= SM+ farelo de algodão + Mi + M; T4 = SM + farelo de amendoim + Mi + M e T5= SM + torta de sementes de seringueira + Mi + uréia + M. Avaliou-se o consumo de matéria seca (CMS), proteína (CPB), extrato etéreo (CEE), fibra em detergente neutro (CFDN), fibra em detergente ácido (CFDA) e matéria mineral (CMM) das diferentes dietas. Utilizou-se a SM como volumoso e concentrados contendo em média 21,85% de proteína bruta, e mistura mineral. Determinou-se a produção diária de leite e a produção corrigida a 3,5% de gordura. Foram obtidos os teores de gordura, proteína, lactose e calculados os teores de sólidos totais e de extrato seco desengordurado. Foram determinados os parâmetros sanguíneos além da eficiência de produção das vacas. O consumo de fibra em detergente ácido foi maior (P<0,01) para as vacas que receberam as dietas contendo a torta de sementes de seringueira. As médias (kg/vaca/dia) de consumo de CMS, CPB, CEE, CFDN, CFDA e CMM foram, respectivamente, de 18,06, 4,66, 2,02, 27,30, 12,53 e 2,37. Houve semelhança (P>0,05) nas médias de produção diária de leite, cujas médias (kg/dia/vaca) foram de 21,79; 22,87; 23,00; 21,43 e 21,43 nos tratamentos T1, T2, T3, T4 e T5, respectivamente. A composição química do leite das vacas submetidas aos diferentes tratamentos foi semelhante, assim como a eficiência de produção (P>0,05). Em relação aos parâmetros sanguíneos, os teores de glicose, AST e GGT não apresentaram diferença estatística (P>0,05) e permaneceram dentro dos parâmetros adequados para vacas leiteiras. A utilização de 15% de torta de sementes de seringueira é uma opção a mais como ingrediente para uso no concentrado para vacas leiteiras. / The objective of this study was to evaluate the effect of diets with different protein sources on nutrient intake, production and chemical composition of milk and blood parameters of Holstein cows. This study was conducted in dairy cattle sector of FCAV / UNESP, Jaboticabal. Were evaluated 05 Holstein cows, weighing on average 560 kg, allocated according to calving order, days of lactation and level of production in Latin Square 5 x 5. The cows received rations were the following treatments: T1 = silage maize (SM) + commercial concentrated 20.85% CP + mineral mixture (M); T2 = SM + soybean meal + maize (Mi) + M; T3 = SM + cottonseed meal + Mi + M; T4 = SM + peanut meal + Mi + M and T5 = SM + rubber seeds cake + Mi + urea + M. Evaluated the dry matter intake (DMI), protein (CP), ether extract (EE) , neutral detergent fiber (NDF), acid detergent fiber (ADF) and mineral matter (CMM) of the different diets. We used the SM as roughage and concentrates containing an average of 21.85% crude protein and mineral mixture. It was determined daily milk production and adjusted to 3.5% fat. the fat content was obtained, protein, lactose and calculated the total solids and nonfat dry extract. Blood parameters were determined besides cows production efficiency. fiber consumption acid detergent was higher (P <0.01) for cows fed diets containing the rubber seeds cake. Mean (kg / cow / day) CMS consumption, CPB, EEC, NDF, CADF and CMM were respectively 18.06, 4.66, 2.02, 27.30, 12.53 and 2, 37. There were similar (P> 0.05) in mean daily milk production, whose average (kg / cow / day) were 21.79; 22.87; 23,00; 21.43 and 21.43 in T1, T2, T3, T4 and T5, respectively. The chemical composition of milk from cows subjected to the different treatments was similar, as well as the production efficiency (P> 0.05). In relation to the blood parameters, the levels of glucose, AST and GGT showed no statistical difference (P> 0.05) and remained within the proper parameters for dairy cows. The use of 15% of rubber seeds cake is an additional option as an ingredient for use in concentrate for dairy cows.

Submitted by Claudia Rocha (claudia.rocha@udesc.br) on 2018-03-15T13:27:54Z No. of bitstreams: 1 PGCA16MA208.pdf: 759581 bytes, checksum: 66fd12477aaa280fa6f6beece50c33c0 (MD5) / Made available in DSpace on 2018-03-15T13:27:54Z (GMT). No. of bitstreams: 1 PGCA16MA208.pdf: 759581 bytes, checksum: 66fd12477aaa280fa6f6beece50c33c0 (MD5) Previous issue date: 2016-07-29 / Feeding systems based on mixed diets comprising grazed pasture and conserved forages are useful during times of low pasture accumulation rate and/or to increase stocking rate and milk production per area. This work aimed to evaluate DM intake and milk production of dairy cows strip-grazing a mixed perennial pasture (Festuca arundinacea, Trifolium repens) without supplementation (control, C) or supplemented with corn silage (CS) or partial mixed ration (PMR). Twelve Holstein cows and F1 (Holstein × Jersey), in the middle third of lactation (133 ± 43 days in milk), were divided into six lots and distributed in a Latin square 3 × 3 replicated twice, with three periods of 15 days, with the last six days for measurements. The treatment C had access to pasture for 21 h/day, with a herbage allowance (PA) of 35 kg DM/day at ground level. Supplemented treatments had access to pasture for 7 h/day (from 0830 to 1530 h), with a PA of 25 kg DM/day. The herbage intake was measured by difference between pre and post-grazing pasture mass. The total DM intake (+ 7.3 kg DM), milk production (+ 4.7 kg/day) increased in cows that received PMR compared to unsupplemented cows, but these variables were similar between treatment C and CS. The DM herbage intake (+ 2.8 kg DM/day) and the proportion of time spent grazing (+ 25%) were higher in animals with CS supplementation compared to animals receiving PMR supplementation. It is concluded that, to dairy cows grazing mixed perennial species, CS supplementation is a tool to increase milk production per area without reductions on a milk production per cow basis, whereas PMR supplementation is a tool to improve total DM intake and milk production per cow and per area / Sistemas baseados em dietas mistas que compreendem pastagem e forragens conservadas são úteis durante os períodos do ano onde se tem uma taxa de acúmulo do pasto baixa e / ou para aumentar a taxa de lotação e produção de leite por área. Este trabalho teve como objetivo avaliar o consumo de MS e a produção de leite de vacas leiteiras em pasto perene de inverno composto por um consórcio de festuca e trevo-branco Festuca arundinacea, Trifolium repens), submetidas a três tratamentos, um controle sem suplementação (SS) ou suplementadas com silagem de milho (SM) ou ração misturada parcial (PMR). Doze vacas da raça Holandesa e F1 (Holandês × Jersey), no terço médio da lactação (133 ± 43 dias em lactação), foram divididos em seis lotes e distribuídos em um quadrado latino 3 × 3 replicado duas vezes, com três períodos de 15 dias, com os últimos cinco dias para as medições. Os animais do tratamento SS tiveram acesso a pastagens durante 22 h / dia, com uma oferta de forragem de 35 kg de MS / dia no nível do solo. Os tratamentos suplementados tiveram acesso ao pasto durante 7 horas /dia (08:30-15:30 h), com um oferta de 25 kg / dia de MS. O consumo de forragem foi medida pela diferença entre a massa pasto pré e pós-pastejo. O consumo de MS total (+ 7,3 kg de MS), e a produção de leite (+ 4,7 kg / dia) aumentaram nas vacas que receberam PMR em comparação com vacas não suplementadas, mas estas variáveis foram semelhantes entre os tratamentos SS e SM. O consumo de MS de forragem (+ 2,8 kg de MS / dia) e a proporção de tempo gasto pastoreio (+ 25%) foram maiores nos animais de SM em comparação com animais de RPM. Conclui-se que, para vacas leiteiras em pasto perene de inverno, a suplementação com silagem de milho é uma ferramenta para aumentar a produção de leite por área sem reduções em uma produção de leite por vaca, enquanto que a suplementação PMR é uma ferramenta para melhorar o consumo de MS total e produção de leite por vaca e por área

Submitted by Claudia Rocha (claudia.rocha@udesc.br) on 2018-03-15T17:08:18Z No. of bitstreams: 1 PGCA17MA214.pdf: 1462448 bytes, checksum: d0c357a0a70e666c70e6a3ccf065d2f6 (MD5) / Made available in DSpace on 2018-03-15T17:08:18Z (GMT). No. of bitstreams: 1 PGCA17MA214.pdf: 1462448 bytes, checksum: d0c357a0a70e666c70e6a3ccf065d2f6 (MD5) Previous issue date: 2017-03-23 / Capes / Energy is the most limiting nutrient to dairy cows at pasture, especially at tropical pastures. However when energy supplementation is offered, other nutrients may become limiting, as the protein under forms of Rumen Degradable Protein (RDP) or Rumen Undegradable Protein (RUP). The objective of this study was evaluate the effects of supplementation with energetic or energetic-proteic concentrate with protein sources of high or low rumen degradability to high producing Jersey cows grazing tropical grasses. Thirty Jersey cows (DIM 58.2 ± 44.4, milk yield 21.0± 4.4 kg and body weight 345.5 ± 32.1 kg at the beginning of the experiment) were assigned to one of three continuous treatments in a 12-wk trial (1 for adaptation and 11 experimental) from October to December, which consisted of three concentrate supplements: energetic, 14% of crude protein (CP), energy-protein 20% of CP with high RDP and a energy-protein 20% of CP with high RUP, offered at 7 kg/ cow/ day,, twice after milking. Concentrates were composed by ground corn, soybean hulls, solvent soybean meal or treated soybean meal (Soypass BR®), minerals and vitamins. The cows grazed a fertilized pasture with predominance of giant-missionary grass (Axonopus catharinensis), under intermittent stocking. Milk yield was taken daily, milk composition and body condition score (BCS), were taken weekly. Body weight was taken at begin and end of experiment. After experimental period, the cows received the same management and feed supply by 11 weeks for evaluation of carryover effects. The milk yield increased at 2 kg/cow/day, as the fat, protein and lactose yields were greater for cows receiving RUP supplementation. Live weight gain and dry matter intake also were increased by RUP supplementation. At post experimental period, the cows that had received RUP produced more milk and protein. Supplementation of RUP to cows at tropical pasture increased the milk, milk components yield and weight gain, with carryover effects along lactation. Supplementation with RDP did not increase milk or milk components yield when compared with energy supplementation / A energia é o nutriente mais limitante para vacas leiteiras em pastagens, especialmente em pastagens tropicais, no entanto quando é oferecida suplementação energética outros nutrientes podem se tornar limitantes como a proteína sob as formas de Proteína Degradável no Rúmen (PDR) ou Proteína Não Degradável no Rúmen (PNDR). O objetivo deste estudo foi avaliar os efeitos da suplementação concentrada energética ou energético-proteica com fontes de proteína de alta ou baixa degradabilidade ruminal para vacas Jersey de alta produção mantidas em pastagem tropical. Trinta vacas Jersey (DEL 58.2 ± 44.4, produção de leite 21.0± 4.4 kg e peso vivo 345.5 ± 32.1 kg no início do experimento) foram alocadas em um dos três tratamentos contínuos em um experimento de 12 semanas (1 para adaptação e 11 experimentais) de outubro a dezembro que consistiram de três suplementos concentrados: energético com 14% de Proteína Bruta (PB), energético-proteico com 20% de PB com alta PDR e energético-proteico com 20% de PB com alta PNDR, oferecidos na taxa de 7 kg/vaca/dia em duas vezes após as ordenhas. Os concentrados foram compostos por milho moído, casca de soja, farelo de soja ou farelo de soja tratado (Soypass BR®), minerais e vitaminas. As vacas foram mantidas em uma pastagem fertilizada com predominância de missioneira gigante (Axonopus catharinensis), sob lotação intermitente. A produção de leite foi medida diariamente, a composição do leite e o escore de condição corporal (ECC) foram avaliados semanalmente. O peso vivo foi mensurado no início e final do período experimental. Após o período experimental, as vacas receberam o mesmo manejo e alimentação por 11 semanas para avaliação de efeitos residuais dos tratamentos. A produção de leite aumentou em 2 kg/vaca/dia, e também as produções diárias de gordura, proteína e lactose foram maiores para as vacas recebendo suplementação com PNDR. O peso vivo e o consumo de matéria seca foram aumentados pela suplementação com PNDR. No período pós-experimental, as vacas que tinham recebido PNDR produziram mais leite e proteína. A suplementação com PNDR para vacas em pastagem tropical aumentou a produção de leite, de componentes do leite e o ganho de peso das vacas, com efeitos residuais ao longo da lactação. A suplementação com PDR não aumentou a produção de leite ou de componentes quando comparado com a suplementação energética