Genetic and phenotypic correlations between weights and first lactation milk production in Guzera heifers

Authors

  • João Ademir de Oliveira Universidade Estadual Paulista, FCAV, Departamento de Ciências Exatas, Jaboticabal, SP
  • Luiz Antonio Framartino Bezerra Universidade de São Paulo, FMRP, Departamento de Genética, Ribeirão Preto, SP
  • João Francisco Pereira Bastos Universidade Estadual Paulista, FEIS, Departamento de Biologia Aplicada e Agropecuária, Ilha Solteira, SP

Keywords:

genetic correlations, phenotypic correlation, weight, milk production, bovines

Abstract

Genetic an phenotypic correlations between weight at 18 (W18) and 24 and months (W24) old and pospartum weight (PW) of Guzera heifers and their first lactation milk production (MP) were estimated to study the usefulness of weight in predicting future milk production. Correlations were estimated from paternal half-sister analyses involving 159 daughters of 23 sires, born in Teaching and Research Farm, Ilha Solteira, UNESP. Phenotypiç correlations between W18 and MP, W24 and MP, and PW and MP were respectively, 0.07; 0.16 and 0.22, being the last one significantly (P < 0.01) different from zero. Estimates of genetic correlations. in the same order, were: -0.08±0.39; 0.12±0.33 and 0.13±0.32, and were not significantly (P>0.0l) different from zero. The present results suggest that the weights seem to be of little value in predicting milk production, and that the two characters can be regarded as genetically independent in a selection programme.

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Published

2014-01-14

Issue

Section

GENETIC

How to Cite

Genetic and phenotypic correlations between weights and first lactation milk production in Guzera heifers. (2014). Bulletin of Animal Husbandry, 51(1), 7-11. http://bia.iz.sp.gov.br/index.php/bia/article/view/816

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