Genetic correlations between male scrotal circumference and female productive and reproductive traits in Nellore cattle

Revista Brasileira de Zootecnia

Rorato, Paulo Roberto Nogara²  Albuquerque, Lucia Galvão de¹  Boligon, Arione Augusti¹ 

[1] UNESP, Jaboticabal;UFSM, Santa Maria

关键词: age at first calving;    fertility;    genetic parameters;    heritability;    weight    Introdução Entre as características importantes a serem consideradas nos sistemas de produção de carne bovina;    destacam-se a eficiência reprodutiva e a taxa de crescimento;   

DOI  :  10.1590/S1516-35982007000300007

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

Genetic parameters for scrotal circumference at 12 (SC12) and at 18 months of age (SC18) of males, and yearling weight (W365), weight at first calving (WFC), age at first calving (AFC), days to first calving (DC) and length of first gestation (GL) of females were estimated using records from 9,932 females and 14,521 males from 28 Nellore herds, located in the South and Southeast regions of Brazil. Covariance components were estimated by REML, fitting bivariate animal models. Heritability estimates were high for SC12 (0.25 to 0.26), SC18 (0.35 to 0.37), W365 (0.35 and 0.38), WFC (0.40 and 0.41) and GL (0.19 and 0.20), but low for AFC (0.14 and 0.15) and DC (0.05 and 0.06). Genetic correlation estimates between SC12 and W365, WFC, AFC, DC and GL were 0.28, 0.30, -0.15, -0.04 and 0.10, respectively. In the same order, the respective genetic correlation estimates between SC18 and female traits were 0.29, 0.32, -0.21, -0.08 and 0.14. These results suggest that selection to improve female fertility efficiency based on SC18 would be more effective than by using SC12.

【 授权许可】

CC BY-NC