Iranian Journal of animal Science

Iranian Journal of animal Science

Estimation of genetic and phenotypic parameters for first three lactation profitability in Iranian Holstein cows

Document Type : Research Paper

Authors
Sara Hassanvand-Javanmard 1
Ali Sadeghi-Sefidmazgi 2
Mohammad Dadpasand 3
1 Former M.Sc. Student, Department of Animal Science, Faculty of Agriculture, Isfahan University of Technology, Iran
2 Assistant Professor, Department of Animal Science, Faculty of Agriculture, Isfahan University of Technology, Iran
3 Associated Professor, Department of Animal Science, College of Agriculture, Shiraz University, Iran
10.22059/ijas.2017.132186.653353
Abstract
Genetic and phenotypic parameters for the first three lactations profitability and sum of first three lactations as lifetime profitability in Iranian Holstein cows were estimated, using data of 86,065 cows in 423 herds, from 2000 to 2011 collected by the Animal Breeding Centre of Iran (ABCI). Economic data were collected from three large dairy farms in Isfahan province. Estimates were performed by using bivariate animal model through the VCE.6.2 software. Estimated heritabilities were moderate and ranged from 0.14 (for third lactation profitability) to 0.32 (for lifetime profitability). Estimated genetic correlations were close to one and ranged from 0.88 between first and third lactation profitability to 0.99 between second lactation profitability and lifetime profitability. Phenotypic correlations were high and in the range of 0.38 between first and third lactation profitability to 0.82 between second lactation profitability and lifetime. Genetic and phenotypic correlations between first lactation and lifetime profitability were 0.96 and 0.76, respectively. These high values of correlations and heritabilities obtained for the first lactation profitability (0.31) showed that the profitability of the first lactation might be a good predictor of lifetime profitability. Therefore, by direct selection on first lactation profitability, genetic-economic merit could be improved.
Keywords
Dairy cattle
genetic parameters
Profit
total economic merit
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Iranian Journal of animal Science
Volume 47, Issue 4 - Serial Number 4
Winter 2017
Pages 531-538

  • Receive Date 22 September 2015
  • Revise Date 31 July 2016
  • Accept Date 28 February 2017