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Related Experiment Videos

Response to selection for milk yield in Holsteins

O M Meland, R E Pearson, J M White

    Journal of Dairy Science
    |November 1, 1982
    PubMed
    Summary

    Selection for increased milk yield in dairy cows led to a slight decrease in fat percentage, demonstrating a negative correlated response. Genetic and environmental factors were analyzed over 11 years in Virginia institutional herds.

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    Area of Science:

    • Animal Breeding and Genetics
    • Dairy Science
    • Quantitative Genetics

    Background:

    • Long-term selection experiments are crucial for understanding genetic progress in livestock.
    • Differentiating genetic from environmental effects is essential for accurate breeding value estimation.
    • Correlated responses to selection can impact other economically important traits.

    Purpose of the Study:

    • To quantify the response to selection for milk yield in dairy cattle.
    • To investigate the correlated response in milk fat and fat percentage.
    • To separate genetic and environmental influences on milk production traits.

    Main Methods:

    • Utilized a randombred control population to isolate genetic effects.
    • Employed best linear unbiased prediction (BLUP) for genetic evaluation.
    • Analyzed data using deviation of selection from control group means and least squares methods.

    Main Results:

    • Significant positive genetic gain for milk yield (370-438 kg) was observed across analyses.
    • A small but consistent negative correlated response in fat percentage (-0.02% to -0.10%) was detected.
    • Differences in fat yield were positive (6-10 kg), but fat percentage showed variability.

    Conclusions:

    • Selection for milk yield results in a negative correlated response for fat percentage.
    • Genetic trends align with sire predicted differences, with minor generation effects.
    • Herd-specific variations in response highlight the complexity of dairy cattle breeding programs.

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