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Genetic analysis of reproductive traits in brahman cattle
- Source :
- Archivos de Zootecnia v.61 n.236 2012, SciELO España. Revistas Científicas Españolas de Ciencias de la Salud, instname, Scopus, Repositório Institucional da UNESP, Universidade Estadual Paulista (UNESP), instacron:UNESP, Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual), Universidade de São Paulo (USP), instacron:USP
- Publication Year :
- 2012
- Publisher :
- Universidad de Córdoba, 2012.
-
Abstract
- Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-27T11:27:21Z No. of bitstreams: 0 Made available in DSpace on 2014-05-27T11:27:21Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-12-01 Aiming to establish selection criteria for the Brahman cattle in Brazil, the objective of this paper was to estimate genetic and environmental parameters for birth weight (BW), gestation length (GL) and scrotal circumference at 365 (SC365), 455 (SC455) and 550 (SC 550) days of age, and relative efficiency of indirect versus direct selection for these traits. Data were obtained from 15 851 animals belonging to 16 herds in six states, enrolled in a genetic breeding program. (Co)variance and heritability coefficients and genetic and environmental correlations between traits were estimated by restricted maximum likelihood (REML) under a multi trait animal model. The model included as fixed effects the contemporary group and the age of cow at calving as a covariate (linear and quadratic), and as random the direct genetic, the permanent environmental and residual effects. For BW and GL it was also considered the maternal genetic effect as random. Estimates of direct heritabilities were 0.36, 0.29, 0.55, 0.43 and 0.40 for BW, GL, SC365, SC455 and SC550, respectively. Genetic correlations between BW and GL, GL and SC365, GL and SC455, GL and SC550, SC365 and SC455, SC365 and SC550 and SC455 and SC550, were respectively 0.06, 0.13, 0.20, 0.13, 0.96, 0.98 and 0.99. The heritabilities estimates for all traits indicated these show enough additive genetic variability to respond favorably to selection. For sexual precocity, the best option would be SC365, due to the high value of heritability and to indirect selection at this age being more efficient than direct selection for PE455. Associação dos Criadores de Brahman do Brasil, Uberaba, MG Universidade Estadual Paulista (UNESP) Faculdade de Ciências Agrárias e Veterinárias (FCAV), Jaboticabal, SP Associação Nacional de Criadores e Pesquisadores, Ribeirão Preto, SP Universidade Estadual Paulista (UNESP) Faculdade de Ciências Agrárias e Veterinárias (FCAV), Jaboticabal, SP
- Subjects :
- CARACTERÍSTICAS SEXUAIS ANIMAL
Breeding program
Restricted maximum likelihood
Brahman
Parâmetros genéticos
Gestation period
General Medicine
Heritability
Biology
Genetic parameters
Scrotal circumference
Peso ao nascer
Período de gestação
Animal science
Relative efficiency of selection
Birth weight
Genetic variation
Gestation length
Animalia
Animal Science and Zoology
Bos
Genetic variability
Perímetro escrotal
Eficiência relativa de seleção
Selection (genetic algorithm)
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Archivos de Zootecnia v.61 n.236 2012, SciELO España. Revistas Científicas Españolas de Ciencias de la Salud, instname, Scopus, Repositório Institucional da UNESP, Universidade Estadual Paulista (UNESP), instacron:UNESP, Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual), Universidade de São Paulo (USP), instacron:USP
- Accession number :
- edsair.doi.dedup.....9f59f8c22eea9fa776c16cc3a9843b18