725
Genetic relationship amongst reproductive traits in Nellore cattle

Monday, August 18, 2014
Posters (The Westin Bayshore)
Aline R Guarini , Universidade Estadual Paulista, Jaboticabal, Brazil
Haroldo H. R. Neves , GenSys Associated Consultants, Porto Alegre, Brazil
Flavio S Schenkel , Centre for Genetic Improvement of Livestock, University of Guelph, Guelph, ON, Canada
Roberto Carvalheiro , Universidade Estadual Paulista “Júlio de Mesquita Filho”- UNESP, Faculdade de Ciências Agrárias e Veterinárias, Jaboticabal, Brazil
Patricia Tholon , Embrapa Pecuária Sudeste, São Carlos, Brazil
João A Oliveira , Universidade Estadual Paulista, Jaboticabal, Brazil
Sandra A Queiroz , Universidade Estadual Paulista, Jaboticabal, Brazil
Abstract Text: This study aimed at estimating genetic parameters for reproductive traits (RT); and also the genetic relationship amongst scrotal circumference (SC), number of calving at 53 months (NC53), heifers rebreeding (HR) and stayability. The (co)variances and genetic parameters were estimated using Bayesian inference. NC53, HR and stayability were analyzed assuming a threshold model while SC a linear model. The heritability estimated for NC53 was 0.22 and it was correlated with stayability (0.99), meaning selection for NC53 would improve productive longevity of cows. Correlations estimated between HR and stayability and between HR and NC53 allow an improvement on HR rates if selection were applied to traits related to longevity. Genetic correlations amongst SC and female RT were positive but weak, suggesting the need to use RT directly measured in females in order to obtain improvements in sexual precocity and longevity.

Keywords:

Bayesian inference

reproductive efficiency

threshold model

See more of: Posters: Beef Cattle Breeding (Group 2)
See more of: Species Breeding: Beef cattle
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