Relação da incidência de mastite, morfometria da glândula mamária e produção de leite em ovelhas da raça Santa Inês de alta e baixa liberação de cortisol

• Autor(a) principal: Emediato, Rodrigo Martins de Souza [UNESP]
• Data de Publicação: 2015
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/132234; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/13-10-2015/000852078.pdf
• topic: Ovelha; Glandulas mamarias; Hormonios; Leite - Produção; Dairy products

The aim of this study at evaluating whether cortisol release level of Santa Ines ewes influences their performance and incidence of mastitis. It were used forty nine Santa Inês ewes, which were submitted to an application of exogenous ACTH (1ml/10 kg BW) for later be divided into 2 groups according to the level of plasma cortisol concentration at the peak of its release curve: AC (high cortisol) and BC (low cortisol). It were analyzed ewes and lambs performance for weight gain at lambing and weaning, as well as CMT, CCS, milk production, protein and fat. Data were analyzed using analysis of variance and Tukey test at 5% significance level. The AC group had higher mean plasma cortisol (225.45 ± 52.08 vs 114.65 ± 36.11 ng/ml) than the BC group, but there was no effect level of cortisol release on the variables considered. Effect was observed for period (before and after weaning) for milk production (924.27 vs 232.19 ml) and crude protein (4.16 vs 5.79%), respectively. For CMT and CCS, no differences were found. It was concluded that the level of cortisol release does not affect the performance or the incidence of mastitis of Santa Ines ewes.