Population structure of Brazilian Gyr dairy cattle

Revista Brasileira de Zootecnia

Torres, Robledo de Almeida²  Carneiro, Paulo Luiz Souza⁴  Verneque, Rui da Silva³  Teodoro, Roberto Luiz³  Lopes, Paulo Sávio²  Reis Filho, João Cruz¹ 

[1] Ministério da Agricultura, Pecuária e Abastecimento, Brasília;Universidade Federal de Viçosa (UFV), Viçosa;Embrapa Gado de Leite, Juiz de Fora;Universidade Estadual do Sudoeste da Bahia (UESB), Jequié

关键词: effective size;    generation interval;    inbreeding;    progeny test RESUMO O objetivo neste trabalho foi avaliar a estrutura genética da raça Gir selecionada para produção de leite;   

DOI  :  10.1590/S1516-35982010001200012

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

The objective of the present study was to evaluate the genetic structure of Gyr cattle selected for milk production. Files of pedigree and production were composed of 27,610 animals. The ENDOG program was used for the calculation of individual inbreeding coefficient (F) and coefficient of average relatedness (AR), effective number of animals(Ne), effective number of founders (fe) and ancestors (fa), and generation interval (GI). Individual inbreeding coefficients and average relatedness in the population were 2.82% and 2.10%, respectively. It was observed a reduction in the effective number of animals, especially after publication of the results of the first progeny test. The estimated effective number of founders was 146 and 75 for the ancestrals. Out of those, only 28 ancestors accounted for the origin of 50% of the population genes. The average generation interval was 8.41 years and it was longer for males than for females. For maintaining genetic variability in future generations, it should be invested mating strategies that reduce inbreeding and which do not use massively only some high breeding value sires.

【 授权许可】

CC BY-NC