Utilização de antioxidantes associados ou não a emulsificante na criopreservação do sêmen bovino

• Ano de defesa: 2003
• Autor(a) principal: Borges, Juliana Corrêa
• Orientador(a): Guimarães, José Domingos
• Banca de defesa: Costa, Eduardo Paulino da , Torres, Ciro Alexandre Alves , Carvalho, Giovanni Ribeiro de , Ruas, José Reinaldo Mendes
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Medicina Veterinária
• Departamento: Biotecnologia, diagnóstico e controle de doenças; Epidemiologia e controle de qualidade de prod. de
• País: BR
• Palavras-chave em Português: Bovino; Sêmen; Criopreservação
• Palavras-chave em Inglês: Bovine; Semen; Cryopreservation
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::MEDICINA VETERINARIA::REPRODUCAO ANIMAL
• Link de acesso: http://locus.ufv.br/handle/123456789/5198

The objective of this study was to evaluate the efficacy of different associations of natural antioxidants in freezing the bovine semen. Eighteen ejaculates from three bulls were used to test the following associations: T1 TRIS egg yolk extender (control group); T2 control + equex; T3 control + Vitamin E + equex; T4 control + Vitamin C; T5 control + Vitamin E + equex and Vitamin C. The ejaculate was equally distributed in five treatments with a final concentration of 1000 x 106 sperm cells/ml and they were envased in 0.5 mL straws. The straws were cooled for five hours and then frozen in liquid N2. The thawing of the samples was made by immersion of the straws in a 370 C water-bath for 30 seconds. Motility, vigor, pathology, longevity and integrity of sperm cells were evaluated by hiposmotic and termoresistance test pre and pos-freezing. There was no difference (P > 0.05) in motility among treatments neither pre nor pos-freezing. In the pos-thawed semen T5 showed the best vigor (3.51; P < 0.05). There was significant (P < 0.05) difference between medium values obtained in T 2, T3, T4, T5 (29.67; 36.55; 31.83; 35.78; respectively) and the value obtained in T1 (control; 25.17). Treatments 2, 3, 4, 5 showed higher values for functional and structural integrity of sperm plasma membrane than showed treatment 1, as observed in the fluorescent test. It may be concluded that the use of antioxidants in bovine semen extender for cryopreservation protects sperm plasma membrane, although it did not increase the sperm motility.