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Registro Completo
Biblioteca(s):  Embrapa Caprinos e Ovinos.
Data corrente:  12/02/1996
Data da última atualização:  13/06/2023
Autoria:  BURFENING, P. J.; KRESS, D. D.
Título:  Direct and maternal effects on bird and weaning weight in sheep.
Ano de publicação:  1993
Fonte/Imprenta:  Small Ruminant Research, v. 10, n. 2, p. 153-163, Mar. 1993.
DOI:  https://doi.org/10.1016/0921-4488(93)90058-P
Idioma:  Inglês
Conteúdo:  Abstract: Weights at birth (BW) and weaning (120W) of Rambouillet, Targhee and Columbia lambs adjusted for sex, age of dam, year and type of birth and rearing, were used to study genetic relationships between direct and maternal effects. Data were analyzed to estimate variances among and within paternal and maternal half-sibs, variances among full-sibs and cousins and the covariances offspring-dam and offspring-sire. Heritability estimates for BW and 120W were 0.33 and 0.34 (paternal half-sib), 0.38 and 0.20 (regression offspring-dam), and 0.17 and 0.08 (regression offspring-sire), respectively. Observed variances and covariances were equated to their theoretical expectations for additive and dominance direct and maternal effects using five different statistical models. Each model was applied to a data set grouping animals with specific relationships. For BW heritability estimates of direct effects ranged between 0.20 and 0.34, for maternal effects they ranged between 0.30 and 0.65 depending on the model applied. Corresponding estimates for 120W ranged between 0.13 and 0.21, and between 0.02 and 0.47. Estimated genetic correlations between additive direct and additive maternal effects for BW ranged between ?0.18 and ?0.74 and for 120W ranged between 0.55 and ?0.88 depending on the model applied. These results indicate that additive direct and additive maternal effects for BW and 120W were important, and that generally a negative genetic correlation between additive direct an... Mostrar Tudo
Palavras-Chave:  Comportamento materno; Desmame; Etologia; Maternal effects.
Thesagro:  Ovino.
Thesaurus Nal:  Birth weight; Reproduction; Sheep; Weaning.
Categoria do assunto:  L Ciência Animal e Produtos de Origem Animal
Marc:  Mostrar Marc Completo
Registro original:  Embrapa Caprinos e Ovinos (CNPC)
Biblioteca ID Origem Tipo/Formato Classificação Cutter Registro Volume Status URL
CNPC9592 - 1ADDAP - PP
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