Efeito da linhagem citoplasmática sobre o peso ao nascer e o ganho médio diário na pré-desmama em bovinos da raça Caracu
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Data
2001-02-01
Autores
Pelicioni, Luciele Cristina [UNESP]
Queiroz, Sandra Aidar de [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira de Zootecnia
Resumo
O objetivo do presente estudo foi avaliar o efeito da linhagem citoplasmática sobre as características peso ao nascer (PN) e ganho médio diário pré-desmama (GMD) de, respectivamente, 4.212 e 3844 registros de bezerros de um rebanho da raça Caracu. A linhagem citoplasmática (LC) foi estudada traçando-se o pedigree dos animais até as fêmeas fundadoras do rebanho. Com o intuito de apresentar estimativas de (co)variâncias e parâmetros genéticos para as características PN e GMD, incluindo-se ou não os componentes de efeito materno e de linhagem citoplasmática, foram realizadas análises sob seis diferentes modelos pelo método de máxima verossimilhança restrita livre de derivada. A variância de linhagem citoplasmática nos dois modelos que incluíram esse efeito apresentou-se muito baixa, fornecendo estimativas praticamente nulas, 0,6172x10-5 e 0,1339x10-5; 0,62557x10-7 e 0,49502x10-7, para PN e GMD, respectivamente. O efeito de LC pode ser desconsiderado na modelagem das características PN e GMD de bovinos Caracu.
The objective of this research was to evaluate the effect of cytoplasmic lineage on birth weight (BW) and pre weaning average daily gain (ADG), respectively of 4,212 and 3,844 records of Caracu cattle breed. The cytoplasmic lineage of each cow was traced back to the first female ancestor in the maternal line of its pedigree. The estimates of (co) variances and genetic parameters for BW and ADG including or not the components of maternal and cytoplasmic lineage effects, performed by univariate analyses were evaluated according to six different models using the derivative-free restricted maximum likelihood method. The cytoplasmic lineage variance in the two models that included this effect was very low, 0.6172x10-5 and 0.1339x10-5, 0.62557x10-7 and 0.49502x10-7 for BW and ADG, respectively. The cytoplasmic lineage effect could be neglected in the models of BW and ADG of Caracu cattle.
The objective of this research was to evaluate the effect of cytoplasmic lineage on birth weight (BW) and pre weaning average daily gain (ADG), respectively of 4,212 and 3,844 records of Caracu cattle breed. The cytoplasmic lineage of each cow was traced back to the first female ancestor in the maternal line of its pedigree. The estimates of (co) variances and genetic parameters for BW and ADG including or not the components of maternal and cytoplasmic lineage effects, performed by univariate analyses were evaluated according to six different models using the derivative-free restricted maximum likelihood method. The cytoplasmic lineage variance in the two models that included this effect was very low, 0.6172x10-5 and 0.1339x10-5, 0.62557x10-7 and 0.49502x10-7 for BW and ADG, respectively. The cytoplasmic lineage effect could be neglected in the models of BW and ADG of Caracu cattle.
Descrição
Palavras-chave
cytoplasmic inheritance, dual purpose cattle, Heritability, maternal effect, bovino de dupla aptidão, efeito materno, herança citoplasmática, Herdabilidade
Como citar
Revista Brasileira de Zootecnia. Sociedade Brasileira de Zootecnia, v. 30, n. 1, p. 101-108, 2001.