Título:	Bayesian estimates of genetic parameters for reproductive traits in Nellore cows raised on pasture in tropical regions.
Autoria:	MAGNABOSCO, C. de U. LOPES, F. B. ROSA, G. J. de M. SAINZ, R. D.
Afiliação:	CLAUDIO DE ULHOA MAGNABOSCO, CPAC FERNANDO BRITO LOPES, UNIVERSITY OF WISCONSIN GUILHERME JORDÃO DE MAGALHAES ROSA, UNIVERSITY OF WISCONSIN ROBERTO DANIEL SAINZ GONZALEZ, CPAC.
Ano de publicação:	2016
Referência:	Revista Colombiana de Ciencias Pecuarias, v. 29, p. 119-129, 2016.
Páginas:	p. 119-129
Conteúdo:	Background: Nellore cows are well adapted to tropical conditions, and they have good maternal ability as well as long and prolific reproductive life. Objective: to estimate (co)variances and genetic parameters for calving interval (CI), age at first calving (AFC), gestation length (GL), and days open (DO) in Nellore cows. Methods: covariance components and genetic parameters were estimated using multi-trait Bayesian procedures. Results: three traits had low but statistically significant heritabilities, averaging 0.05, 0.10, and 0.04 for CI, GL, and DO, respectively, whereas age at first calving had a higher heritability (0.36). The permanent environmental effects for CI, GL, and DO were also low, averaging 0.08, 0.07, and 0.15, respectively. The genetic correlations between AFC and CI, AFC and GL, AFC and DO, GL and CI, CI and DO, GL and DO were 0.20, 0.12, 0.11, 0.02, 0.92, and -0.21, respectively. Selection for shorter CI would contribute towards decreasing DO. However, selection for decreased GL could result in a greater number of DO. Despite the favorable genetic correlations, the direct selection responses for these traits would be low. Conclusion: reproductive traits are strongly influenced by environmental effects. Changes in management and environmental factors could rapidly improve reproductive performance of Polled Nellore herds. Genetic selection for these traits should produce a much slower but permanent response.
Thesagro:	Gado de corte Gado nelore Fertilidade Eficiência reprodutiva Melhoramento animal Gado zebu
NAL Thesaurus:	Beef cattle Reproductive efficiency Animal breeding Zebu
Palavras-chave:	Bovino de Corte
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CPAC)