Genetic parameters and environment effects related to calving intervals in a Jersey herd

Authors

  • Rinaldo Polastre
  • Alcides de Amorim Ramos

DOI:

https://doi.org/10.1590/S1678-3921.pab1983.v18.15156

Keywords:

reproductive efficiency, selection and breeding, dairy cattle, genetic improvement

Abstract

A total of 1799 calving intervals from 366 Jersey cows sired by 28 bulls, from 1953 to 1977 were analysed. The analysis of variance, through the least square method showed a significant effect of the year of parturition (P<0.01) and sire (P<0.05). However, month and order of parturition were not significant. The least square mean of calving intervals was 429.3 ± 3.8 days. The heritability and repeatability estimates were 0.05 ± 0.03 and 0.17 ± 0.02, respectively.

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How to Cite

Polastre, R., & Ramos, A. de A. (2014). Genetic parameters and environment effects related to calving intervals in a Jersey herd. Pesquisa Agropecuaria Brasileira, 18(1), 73–77. https://doi.org/10.1590/S1678-3921.pab1983.v18.15156

Issue

v.18, n.1, jan. 1983

Section

ANIMAL SCIENCE