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Crossbreeding parameter estimation for functional longevity in rabbits using survival analysis methodology.

M Piles1, J P Sánchez, J Orengo

  • 1Unitat de Cunicultura, IRTA, Torre Marimón s/n., 08140 Caldes de Montbuí, Barcelona, Spain. miriam.piles@irta.es

Journal of Animal Science
|December 20, 2005
PubMed
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Crossbreeding rabbit lines A and Prat, and V and Prat, significantly improved functional longevity, delaying involuntary culling. This highlights the value of specialized line crosses for rabbit meat production.

Area of Science:

  • Animal Breeding and Genetics
  • Reproductive Biology
  • Quantitative Genetics

Background:

  • Functional longevity, defined as delayed involuntary culling, is crucial for efficient meat rabbit production.
  • Maternal lines A, V, and Prat have undergone long-term selection for litter size at weaning.
  • Understanding crossbreeding parameters is essential for optimizing rabbit breeding programs.

Purpose of the Study:

  • To estimate crossbreeding parameters for functional longevity in rabbits.
  • To evaluate direct genetic effects, maternal genetic effects, and individual heterosis among three specialized maternal lines.
  • To determine the impact of specific line crosses on rabbit longevity.

Main Methods:

  • A complete diallel cross was conducted with three maternal rabbit lines (A, V, Prat).

Related Experiment Videos

  • Survival analysis using a Cox proportional hazard model was applied to 653 does.
  • Generalized least squares procedures were used to estimate crossbreeding parameters.

    • Main Results:

    • Significant differences in direct genetic effects were found between lines A and Prat.
    • Maternal genetic effects did not show significant differences among the lines.
    • Significant and favorable heterosis was observed in crosses between lines A and Prat, and between V and Prat, particularly in the first cross.

    Conclusions:

    • Crossbreeding specialized rabbit lines enhances functional longevity.
    • The use of crosses between lines A and Prat, and V and Prat, is recommended for intensive meat rabbit production.
    • Heterosis plays a significant role in improving rabbit longevity, especially in initial crosses.