Genetic and environmental factors which influence reproduction and milk production traits in goats in the Federal District, Brazil

Revista Brasileira de Zootecnia

McManus, Concepta²  Mariante, Arthur da Silva¹  Soares Filho, Guilherme³ 

[1] EMBRAPA, Brasília;Universidade de Brasília;Faculdade da Terra de Brasília

关键词: age at first kidding;    gestation period;    goats;    kidding interval and milk production;    lactation length   IntroduçãoA eficiência produtiva da pecuária leiteira é;    em parte;    determinada pela eficiência reprodutiva;   

DOI  :  10.1590/S1516-35982001000100020

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

- This study was carried out in the Federal District of Brazil on two goat farms, using data collected on 772 parturitions. The objective was to evaluate genetic and environmental factors, which influenced the reproduction and milk production of Saanen, Parda Alpine, Toggenburg goats and their crosses, between 1995 and 1997. The data were analysed using SAS (Statistical Analysis System, GLM procedures) and the heritabilities were estimated using MTDFREML with an Individual Animal Model. The studied traits were: age at first kidding (IPP), kidding interval (IP), gestation period (PG), total milk production (PLT) and lactation length (DL). The statistical model included fixed effects [farm, breed, month and year of kidding, type of parturition, sex of the kid (male, female)] and the covariate, dam weight at matting time. The Saanen breed had the lowest IPP and the highest PLT, while the Toggenburg breed had the highest IP. The heritabilities were low and dependent on the breed. The factors as farm, breed, month of kidding and sex of the kid affected the IP. The breed and the type of parturition affected the IPP. The breed only influenced the PLT. The results of this work evidenced that there is a high opportunity to improve the goat performances in Federal District, needing more rigor in herd control and management to reduce the IPP and IP and to increase the production levels.

【 授权许可】

CC BY-NC