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Related Experiment Videos

Optimizing pure line breeding strategies utilizing reproductive technologies

T H Meuwissen1

  • 1DLO-Institute for Animal Science and Health, Lelystad, The Netherlands.

Journal of Dairy Science
|October 20, 1998
PubMed
Summary

New reproductive technologies significantly boost dairy cattle genetic gain through nucleus breeding schemes. Combining these techniques with juvenile predictors offers substantial improvements in genetic progress and breeding efficiency.

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Area of Science:

  • Animal Breeding and Genetics
  • Reproductive Technologies
  • Dairy Cattle Improvement

Background:

  • Artificial insemination (AI) and multiple ovulation and embryo transfer (MOET) have revolutionized dairy cattle breeding schemes.
  • MOET has enabled nucleus breeding schemes, increasing selection intensity in cows.
  • In vitro maturation and fertilization further enhance female reproductive rates, boosting genetic gain.

Purpose of the Study:

  • To evaluate the impact of advanced reproductive techniques on genetic gain in dairy cattle.
  • To assess the effectiveness of nucleus breeding schemes and strategies to mitigate associated risks.
  • To explore future methods for accelerating genetic progress in cattle populations.

Main Methods:

  • Analysis of genetic gain from traditional and nucleus breeding schemes utilizing MOET.

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  • Evaluation of selection methods to control inbreeding and response variance.
  • Modeling the potential of juvenile predictors (DNA markers) and enhanced reproductive rates.

    • Main Results:

    • Nucleus schemes with MOET and shorter generation intervals increased genetic gain by ~15% but raised inbreeding risk by ~80%.
    • Optimized selection maximizing differential while constraining inbreeding yielded 30-60% more response than BLUP.
    • Combined juvenile predictors and in vitro techniques could increase genetic gain by 24% in hybrid schemes.

    Conclusions:

    • Advanced reproductive technologies and optimized selection strategies are crucial for maximizing genetic gain in dairy cattle.
    • Mitigating inbreeding and response variance is essential for sustainable breeding schemes.
    • Future genetic improvement hinges on integrating genomic selection with enhanced reproductive technologies.