Title:	Inbreeding depression in zebu cattle traits.
Authors:	PEREIRA, R. J. SANTANA JUNIOR, M. L. AYRES, D. R. BIGNARDI, A. B. MENEZES, G. R. de O. SILVA, L. O. C. da MACHADO, C. H. C. JOSAHKIAN, L. A. ALBUQUERQUE, L. G.
Affiliation:	GMAT/UFMT; GMAT/UFMT; GMAT/UFMT; GMAT/UFMT; GILBERTO ROMEIRO DE OLIVEIRA MENEZE, CNPGC; LUIZ OTAVIO CAMPOS DA SILVA, CNPGC; Associalão Brasileira dos criadores de Zebu, Uberlândia; Associação Brasileira dos Criadores de Zebu, Uberlândia; FCAV/USP.
Date Issued:	2016
Citation:	Journal of Animal Breeding and Genetics, v. 133, p. 523-533, 2016.
Description:	The productivity of herds may be negatively affected by inbreeding depression, and it is important to know how intense is this effect on the livestock performance. We performed a comprehensive analysis involving five Zebu breeds reared in Brazil to estimate inbreeding depression in productive and reproductive traits. Inbreeding depression was estimated for 13 traits by including the individual inbreeding rate as a linear covariate in the standard genetic evaluation models. For all breeds and for almost all traits (no effect was observed on gestation length), the performance of the animals was compromised by an increase in inbreeding. The average inbreeding depression was B0.222% and B0.859% per 1% of inbreeding for linear regression coefficients scaled on the percentage of mean (bm) and standard deviation (br), respectively. The means for bm (and B) were B0.269% (B1.202%) for weight/growth traits and B0.174% (B0.546%) for reproductive traits. Hence, inbreeding depression is more pronounced in weight/growth traits than in reproductive traits. These findings highlight the need for the management of inbreeding in the respective breeding programmes of the breeds studied here.
Thesagro:	Gado de corte Gado leiteiro Reprodução
NAL Thesaurus:	Beef cattle Dairy cattle Reproduction
Keywords:	Calving performance Growth
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CNPGC)