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Genetic correlations between six- and seven-week-old broilers.

N Aman, W A Becker

    Poultry Science
    |September 1, 1983
    PubMed
    Summary
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    Genetic correlations between broiler chicken carcass traits at 6 and 7 weeks were moderate to high. Early records on full sibs can aid selection programs for improving traits in older birds.

    Area of Science:

    • Animal Science
    • Genetics
    • Poultry Science

    Background:

    • Understanding genetic relationships between traits is crucial for effective breeding programs in broiler chickens.
    • Carcass traits like live weight, carcass weight, and abdominal fat are economically important in poultry production.

    Purpose of the Study:

    • To determine the genetic correlations between key carcass traits in broiler chickens at 6 and 7 weeks of age.
    • To assess the potential utility of early-age records for genetic improvement of later-age traits.

    Main Methods:

    • A total of 216 male broiler chickens from 42 sires and 108 dams were utilized.
    • Birds were slaughtered at 41 and 48 days of age, with one offspring per dam sampled at each age.
    • Genetic correlations for live weight, carcass weight, abdominal fat weight, and their percentages were calculated.

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    Main Results:

    • Moderate to high genetic correlations were observed between 6 and 7 weeks for all measured traits.
    • Live weight (0.58), carcass weight (0.66), abdominal fat (0.48), % abdominal fat/live weight (0.45), and % abdominal fat/carcass weight (0.42).
    • Mean values for 41-day-old birds were: live weight 1435g, carcass weight 877g, abdominal fat 23.4g, % abdominal fat/live weight 2.04%, % abdominal fat/carcass weight 3.30%.

    Conclusions:

    • Genetic correlations suggest that selection decisions based on 6-week-old traits can influence 7-week-old performance.
    • Records from 6-week-old full sibs may be valuable for improving carcass traits in 7-week-old broiler chickens.
    • This supports the potential for early selection in broiler breeding programs.