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Previous issue date: 2012 === Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) === Objetivou-se avaliar a aplica??o suplementar de quatro doses de ocitocina ex?gena (0, 5, 10, 15 UI) na remo??o do leite residual e os par?metros de produ??o da ordenha, produ??o de leite residual, produ??o total, porcentagem em rela??o ? ordenha total, composi??o e incid?ncia de mastite atrav?s da contagem de c?lulas som?ticas (CCS). O experimento foi conduzido em uma propriedade particular, tipicamente leiteira, localizada no munic?pio de Francisco S?, regi?o Norte de Minas Gerais, durante os meses de fevereiro a junho de 2012. Foram utilizados 20 vacas mesti?as Holand?s-Guzer?, mantidas a pasto com suplementa??o proteica, clinicamente sadias, com grau sangu?neo variando entre animais 3/4 e 7/8, mult?paras, com ordem de parto entre segunda a quinta lacta??o, com 60 dias p?s-parto e produ??o m?dia entre 7 e 13 kg de leite. O delineamento utilizado para as vari?veis de produ??o e composi??o foram inteiramente casualizado (DIC), com repeti??o no tempo (nove semanas). Foi feita a regress?o na an?lise de varia??o. Para verificar a depend?ncia entre a preval?ncia de mastite e as doses suplementares de ocitocina foram realizadas an?lises estat?sticas com teste de Qui-quadrado, sendo os valores dos resultados considerados significativos quando P < 0,01. O volume de leite oriundo da ordenha plena apresentou vari?ncia (P<0,01) e comportamento quadr?tico em rela??o ?s doses suplementares, apresentando nas doses de ocitocina superiores a 5 UI. A produ??o de leite residual apresentou comportamento semelhante, sendo a dose de 10 UI a que melhor promoveu a remo??o do leite residual e consequente produ??o. A produ??o total de leite tamb?m foi influenciada (P<0,01) pela administra??o de ocitocina ex?gena, com maior produ??o acima da dose de 5UI, decrescendo abruptamente com as doses de 10 e 15 UI. A porcentagem de leite residual apresentou mesmo signific?ncia e distribui??o dos dados quadraticamente, com remo??o de 12,3 % de leite residual com a maior dose 15 UI. Na composi??o do leite residual, observou-se signific?ncia (P<0,05) somente quanto ? gordura, n?o apresentando vari?ncia significativa quanto ? lactose e prote?na. A gordura, comportando quadraticamente, obteve maior teor no leite residual quando administrado 9,5 UI, bem pr?ximo a dose tratamento proposto de 10 UI. Quanto ? celularidade do leite (CCS) atrav?s do teste CMT, observou-se rela??o inversa ao aumento das doses suplementares de ocitocina. Em rela??o aos tratamentos 0; 5; 10 e 15UI, a dose de 15 UI resultou em leite com baixa celularidade e melhor qualidade. Maior foi o n?mero de tetos que continham at? 200.000 c?lulas/mL de leite, dentro das normas de produ??o e qualidade determinadas pela Normativa 62. Evidenciou-se o efeito heterog?neo e dose?dependente da ocitocina ex?gena quanto a seus efeitos na produ??o, composi??o e qualidade do leite. === Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Zootecnia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2012. === ABSTRACT
The objective was to evaluate the application of additional four doses of exogenous oxytocin (0, 5, 10, 15 UI) in removing the residual milk and the production parameters of the milking, residual milk production, production total percentage relative milking total composition and incidence of mastitis through somatic cell counts (CCS). The experiment was conducted in a particular dairy property located in the Francisco S? town, North of Minas Gerais, from February to June 2012. It was used 20 crossbred Holstein-Guzera (3/4 and 7/8), kept at pasture with protein supplementation, clinically healthy, multiparous with lactation from second to fifth, at 60 days postpartum and producing an average of between 7 and 13 kg of milk. The design variables for production and composition were completely randomized with repetition time (nine weeks). Regression was performed on variance analysis. To check the dependence between the prevalence of mastitis and supplemental doses of oxytocin statistical analyzes were performed with chi-square test, and the values of the results considered significant (P <0.01). The volume of milk coming from the milking full showed variance (P <0.01) and quadratic behavior regarding additional doses, drop with doses above 5 IU oxytocin. Milk production residual showed similar behavior, with the dose of 10 IU that best promoted the removal of residual milk. The total milk production was also influenced (P <0.01) by exogenous administration of oxytocin, with higher production above the dose 5UI abruptly decreasing with doses of 10 and 15 IU. The residual milk percentage had the same significance and data distribution quadratically, with 12.3% removal residual milk with the highest dose 15 IU. Residual milk composition was observed significance (P <0.05) only fat, showing o the no significant variance lactose and protein. The residual milk fat content was greater than behaving quadratically when administered 9.5 UI, next to the proposed treatment dose of 10 IU. Milk cellularity (CCS) across the CMT test, observed an inverse relationship to increased supplemental doses of oxytocin. Regarding treatments 0, 5, 10 and 15 IU, the dose of 15 IU resulted a low cellularity and the best milk quality. Greater the number of teats containing up to 200,000 cells / ml milk, within production and quality standards determined by Normative 62. Demonstrating heterogeneous effect and dose-dependent of exogenous oxytocin about the milk production, composition and quality.
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