Data/hora: 03/06/2024 04:52:11

Biblioteca(s): | Embrapa Caprinos e Ovinos.
Data corrente: | 12/01/2012
Data da última atualização: | 22/01/2016
Autoria: | LOBO, R. N. B.; FERNANDES JÚNIOR, G. A.; LOBO, A. M. B. O.
Afiliação: | RAIMUNDO NONATO BRAGA LOBO, CNPC; Gerardo Alves Fernandes Júnior, UNESP, Jaboticabal, SP.; ANA MARIA BEZERRA OLIVEIRA LOBO, CNPC.
Título: | Genetic (co)variance components for ratio of lamb weight to ewe metabolic weight as an indicator of ewe efficiency.
Ano de publicação: | 2012
Fonte/Imprenta: | Livestock Science, Amsterdam, v. 143, p. 214-219, 2012.
Idioma: | Inglês
Conteúdo: | Data from a multibreed commercial flock located at Mid-West of Brazil, supported by Programa de Melhoramento Genético de Caprinos e Ovinos de Corte (GENECOC),were used to estimate genetic parameters of traits related to ewe productivity by Average Information Restricted Maximum Likelihood method applied to an animal model. The analyzed traits were litter weight at birth (LWB) and atweaning (LWW), eweweight atweaning (EW)and ewe production efficiency, estimated by WEE=LWW/EW0.75. The heritabilities were 0.26±0.05, 0.32±0.06, 0.37±0.03 and 0.10±0.02 for LWB, LWW, EWand WEE, respectively. Significant effects for direct heterosis were observed for LWWand EW. Recombination losseswere important for EWandWEE. Genetic correlations of LWBwith LWW, EWandWEEwere 0.68, 0.37 and 0.15, respectively; of LWWwith EW and WEE were 0.30 and 0.34, respectively; and between EW and WEE was ?0.25. Even though it is a low heritability trait, WEE can be indicated as a selection criteria for improving the ewe productivity without increasing the mature weight of animals due to its genetic correlations with LWWand other traits.
Palavras-Chave: | Animal model; Brasil; Correlação genética; Herdabilidade; Modelo animal; Multibreed flock; Non-additive effects.
Thesagro: | Cordeiro; Melhoramento genético animal; Ovino; Peso ao nascer.
Thesaurus Nal: | Birth weight; Genetic correlation; Heritability; Sheep.
Categoria do assunto: | --
Registro original: | Embrapa Caprinos e Ovinos (CNPC)
Exemplares: | CNPC - (25055-1) - UPC - AP - PP - SP 07011 -  - SP 07011 - DIS