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Related Experiment Videos

Factors affecting calf livability for Holsteins.

M L Martinez, A E Freeman, P J Berger

    Journal of Dairy Science
    |November 1, 1983
    PubMed
    Summary

    Calf mortality in Holstein calves is higher in males and first-parity dams. Gestation length and calf size impact calf livability, with small heritability estimates for this trait.

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    Area of Science:

    • Animal Science
    • Veterinary Medicine
    • Reproductive Biology

    Background:

    • Calf mortality presents a significant challenge in dairy cattle production.
    • Understanding factors influencing calf livability is crucial for improving herd management and economic viability.

    Purpose of the Study:

    • To investigate the impact of sex, dam parity, calf size, and gestation length on calf mortality in Holstein cattle.
    • To estimate the heritability of calf livability.

    Main Methods:

    • Analysis of 136,775 Holstein calving records from the National Association of Animal Breeders.
    • Statistical modeling including effects of calf sex, dam parity, gestation length, and sire.
    • Estimation of heritability for calf livability using mixed models.

    Main Results:

    • Male calves exhibited higher mortality (7.6%) than females (5.6%).
    • First-parity dams had approximately double the calf mortality compared to later parities (10.5% vs. 5.6%).
    • Calf livability showed a nonlinear relationship with calf size and was influenced by gestation length, sex, and dam parity.

    Conclusions:

    • Calf mortality is influenced by multiple factors including sex, maternal age, and gestation length.
    • Heritability estimates for calf livability are low, suggesting environmental factors play a significant role.
    • Accurate assessment of calf livability requires consideration of gestation length.

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