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Correlations between calving ease and calf survival.

R I Cue, J F Hayes

    Journal of Dairy Science
    |April 1, 1985
    PubMed
    Summary

    Genetic and phenotypic correlations between calving ease and calf survival were estimated. Favorable genetic associations were found, suggesting improvements in calving ease could enhance calf survival rates.

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    Area of Science:

    • Animal Genetics
    • Reproductive Biology
    • Livestock Science

    Background:

    • Calving ease and calf survival are critical traits in cattle production.
    • Understanding the genetic basis of these traits is essential for breeding programs.
    • Direct and maternal effects can influence the expression of these traits.

    Purpose of the Study:

    • To estimate heritabilities and genetic correlations between calving ease and calf survival.
    • To investigate direct and maternal genetic effects on these traits.
    • To determine the phenotypic correlations between calving ease and calf survival.

    Main Methods:

    • Multitrait restricted maximum likelihood (REML) methods were employed for estimation.
    • Analyses considered both direct and maternal genetic effects.
    • Genetic and phenotypic correlations were calculated for heifers and cows.

    Main Results:

    • Direct genetic correlation between calving ease and calf survival was approximately -0.8 in both heifers and cows.
    • This strong negative genetic correlation indicates favorable associations.
    • Phenotypic correlations were moderate, with values of -0.32 for heifers and -0.22 for cows.

    Conclusions:

    • Selection for improved calving ease is likely to positively impact calf survival through direct genetic effects.
    • Maternal effects may also play a role, warranting further investigation.
    • These findings have implications for genetic improvement strategies in cattle breeding for enhanced animal welfare and productivity.

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