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Environmental influences on semen output

R W Everett, B Bean

    Journal of Dairy Science
    |July 1, 1982
    PubMed
    Summary

    Holstein sire semen output varies significantly by bull, ejaculate number, and collection interval. Bull age impacts sperm concentration, peaking at 4 years, while environmental factors like month and day show minor effects on semen production.

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    Area of Science:

    • Animal Science
    • Reproductive Biology
    • Dairy Cattle Breeding

    Background:

    • Artificial insemination (AI) relies on consistent semen production from high-value sires.
    • Understanding environmental and biological factors influencing semen output is crucial for optimizing AI programs.

    Purpose of the Study:

    • To analyze semen output characteristics in commercial Holstein sires.
    • To estimate the effects of environmental variables and bull age on semen quality and quantity.

    Main Methods:

    • Analysis of 7,858 ejaculates from 57 Holstein bulls over a 3-year period.
    • Evaluation of semen volume, sperm concentration, and total sperm output.
    • Assessment of factors including bull age, ejaculate order, collection intervals, month, day of week, temperature, and humidity.

    Main Results:

    • Significant variations in semen output were observed between individual bulls, first vs. second ejaculates, and collection intervals.
    • Bull age affected sperm concentration and total sperm output, with peak performance at 4 years.
    • December yielded the highest total sperm production, while June/July showed maximum seminal fluid volume. Fridays had the highest total sperm output.
    • Environmental factors like temperature and humidity had small, inconsistent effects.

    Conclusions:

    • Semen output is highly variable and influenced by biological factors such as bull age and individual differences.
    • Environmental conditions have a limited and inconsistent impact on semen production in Holstein sires.
    • The study does not support the hypothesis that controlled environments can significantly increase semen output.

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