GM 04. Scrotal measurements, weight, and semen quality in Nellore bulls

Jose Aurelio Bergmann ^[1] ; Celia Raquel Quirino ^[2] ; V. R. Vale Filho, ^[1] ; V. J. Andrade ^[1] ; C. G. Fonseca ^[1]
1. [1] Universidade Federal de Minas Gerais
  
  Universidade Federal de Minas Gerais
  
  Brasil
2. [2] Universidad Estatal del Norte Fluminense
  
  Universidad Estatal del Norte Fluminense
  
  Brasil
Localización: Archivos Latinoamericanos de Producción Animal, ISSN 1022-1301, ISSN-e 1022-1301, Vol. 5, Nº. Extra 3, 1997 (Ejemplar dedicado a: Proceedings XV ALPA meeting 2)
Idioma: inglés
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Resumen
- Field data on 215 Nellore bulls (92sires and 123 sons), born from 1989 to 1993, were analyzed using DFREML methodology under uni and bivariate animal models to estimate heritabilities, phenotypic and genetic correlation between testis measurements, body weights and semen characteristics. Heritability estimates for scrotal circumference, left and right testis length and width were, respectively, 0.87, 0.89, 0.89, 0.90 and 8.85. Heritability estimates for motility, volume and vigor were, respectively, 0.12, 0.10 and 0.59. Genetic correlation between all testis measurements were high (from 0.61 to unit). Genetic correlation between scrotal circumference and semen motility, volume and vigor were, respectively, 1.00, 0.00 and 0.69.