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Exploratory analysis of differences in sperm morphology in Nelore and Gir (Bos indicus) bulls |
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| Authors: | Aline Costa de Lucio Antonio Sérgio Ferraudo Leticia Zoccolaro de Oliveira Adriana Santana do Carmo Benner Geraldo Alves Kele Amaral Alves Solange Almeida Luis Alfredo Deragon William Pereira Luisa Cunha Carneiro Vera Fernanda Martins Hossepian de Lima |
| Affiliation: | 1. Departamento de Reprodu??o Animal, Faculdade de Ciências Agrárias e Veterinárias, UNESP, Via de Acesso Prof. Paulo Donato Castellane, s/n, Jaboticabal, S?o Paulo, 14884-900, Brazil 3. Núcleo de Estudos e Pesquisas em Biologia Reprodutiva Animal, Escola de Veterinária e Zootecnia, Universidade Federal de Goiás, Goiania, Goiás, 74001-970, Brazil 2. Alta Genetics do Brasil, Uberaba, Minas Gerais, 38020-970, Brazil |
| Abstract: | The aim of this study was to evaluate the effects of breed and season on semen quality parameters of zebu bulls. Data (1,632 registers) of semen production from Gir (n?=?4) and Nelore (n?=?15) bulls were collected between October 2005 and November 2009. The ejaculates were collected twice a week during various seasons (summer, fall, winter, and spring) and evaluated for the following semen parameters: ejaculate volume, sperm concentration, sperm motility, forward progressive motility (FPM), and sperm morphology. Factor analysis was used to determine the relationship among variables. The effect of breed (Gir and Nelore) and season and their cross effect on each parameter and extracted factor were tested using ANOVA. A negative correlation (P?P? |
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