Effect of cytoplasmic lineage on birth weight and pre weaning average daily gain of Caracu cattle breed

Pelicioni, L.C.; Queiroz, S.A. de

Revista Brasileira de Zootecnia 30(1): 101-108

2001


ISSN/ISBN: 1516-3598
Accession: 003416049

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Abstract
Birthweight (BW) and pre-weaning average daily gain records of Caracu cattle (numbering to 4212 and 3844 records, respectively) were studied to evaluate the effect of cytoplasmic lineage on these parameters. The cytoplasmic lineage of each cow was traced back to the first female ancestor in the maternal line of its pedigree. The (co)variances and genetic parameters for BW and ADG, with or without 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 found to be very low, 0.6172 x 10-5 and 0.1339 x 10-5, for BW, and 0.62557 x 10-7 and 0.49502 x 10-7, for ADG. From the results, it is concluded that cytoplasmic lineage effect could be neglected in the models of BW and ADG of Caracu cattle.