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Study of stayability in Nellore cows using a threshold model.

M H Van Melis1, J P Eler, H N Oliveira

  • 1Universidade Estadual Paulista, Jaboticabal, Brazil. vanmelis@usp.br

Journal of Animal Science
|March 21, 2007
PubMed
Summary

This study shows that stayability traits can improve fertility in Nellore cows. Selecting for stayability, particularly Stay5, offers a viable genetic criterion for enhancing female reproductive efficiency.

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Area of Science:

  • Animal Science
  • Reproductive Biology
  • Quantitative Genetics

Background:

  • Fertility is a critical trait in beef cattle production, directly impacting herd profitability.
  • Improving female fertility requires effective selection strategies and accurate genetic evaluations.
  • Stayability, defined as calving success over time, offers a potential indicator of reproductive longevity.

Purpose of the Study:

  • To assess the feasibility of using stayability traits for enhancing Nellore cow fertility.
  • To investigate the genetic relationships among stayability at different ages (Stay5, Stay6, Stay7).
  • To evaluate stayability as a selection criterion for genetic improvement.

Main Methods:

  • Analysis of stayability data using a maximum a posteriori probit threshold model.
  • Estimation of variance components via Gibbs sampling.
  • Calculation of estimated breeding values (EBVs) and genetic trends on the liability and probability scales.

Main Results:

  • Heritability estimates for Stay5, Stay6, and Stay7 were 0.25, 0.22, and 0.28, respectively.
  • Average annual genetic trends for stayability traits ranged from 0.34% to 0.51%.
  • Adequate genetic variability exists for stayability traits, supporting their use in selection.

Conclusions:

  • Selection based on stayability traits can effectively improve female fertility in Nellore cattle.
  • Stayability traits exhibit sufficient heritability and genetic variability for successful breeding programs.
  • Focusing selection on Stay5 may be more effective for improving overall female reproductive performance.