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vol.30 issue1Effect of cytoplasmic lineage on birth weight and pre weaning average daily gain of Caracu cattle breedBreed and selection for post-weaning weight effects on feedlot and carcass traits for the 15th progeny of Sertãozinho (SP-Brazil) Zebu and Caracu herds author indexsubject indexarticles search
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Revista Brasileira de Zootecnia

Print version ISSN 1516-3598On-line version ISSN 1806-9290


PELICIONI, Luciele Cristina  and  QUEIROZ, Sandra Aidar de. Effect of cytoplasmic lineage on milk yield of Caracu cattle breed. Rev. Bras. Zootec. [online]. 2001, vol.30, n.1, pp.109-114. ISSN 1516-3598.

The objective of this research was to evaluate the effect of cytoplasmic lineage on milk yield of 11,163 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 milk yield 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 estimate in the two models that included this random effect was very low, 0.0025 and 0.0022. Therefore, the inclusion of the random cytoplasmic lineage effect in the milk yield statistical model better explained the milk yield variation and also produced better estimates of genetic parameters for this trait.

Keywords : cytoplasmic inheritance; dairy cattle; heritability.

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