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Prospects for improving reproductive performance through genetic selection.

Kent A Weigel1

  • 1Department of Dairy Science, University of Wisconsin, 1675 Observatory Drive, Madison, WI 53706, USA. kweigel@wisc.edu <kweigel@wisc.edu>

Animal Reproduction Science
|September 12, 2006
PubMed
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Genetic selection can improve dairy cow fertility by focusing on body condition and daughter pregnancy rates, not just milk production. This approach helps cows stay healthy and fertile despite high yields.

Area of Science:

  • Animal Science
  • Reproductive Biology
  • Genetics

Background:

  • High milk production in dairy cows is linked to reduced fertility, characterized by shorter estrous cycles and fewer standing events.
  • Inadequate body condition, more than high milk yield, significantly impacts conception rates, embryonic loss, and anestrus in dairy cattle.

Purpose of the Study:

  • To review prospects for enhancing female fertility in dairy cattle through genetic selection.
  • To highlight the importance of body condition and direct fertility traits in genetic improvement programs.

Main Methods:

  • Review of current genetic evaluation systems for female fertility in dairy cattle.
  • Discussion of indirect selection strategies (longevity, body condition score) and direct selection (daughter pregnancy rate).

Related Experiment Videos

  • Examination of recent developments in data collection and genetic evaluation for disease resistance.

    • Main Results:

    • Genetic improvement is achievable through indirect selection for longevity or body condition score, or direct selection for traits like daughter pregnancy rate.
    • Existing genetic evaluation systems need refinement to account for factors like hormonal synchronization and voluntary waiting periods.
    • New systems are being developed to select bulls whose daughters exhibit resistance to common health disorders.

    Conclusions:

    • Genetic selection offers a viable path to improve dairy cattle fertility, with a focus on body condition and disease resistance alongside production.
    • Refining genetic evaluation systems is crucial for accurately assessing and improving female fertility in dairy herds.
    • Integrating health and fertility traits into genetic selection will enable cows to maintain health and reproductive efficiency under high-yield conditions.