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Related Experiment Videos

Estrous intensity and conception rates in Holsteins.

J S Stevenson, M K Schmidt, E P Call

    Journal of Dairy Science
    |February 1, 1983
    PubMed
    Summary

    Detecting subtle estrus signs in Holstein cows can lead to acceptable conception rates through artificial insemination. Liberal interpretation of estrous symptoms improves fertility outcomes in dairy herds.

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    Area of Science:

    • Animal Science
    • Reproductive Biology
    • Dairy Cattle Management

    Background:

    • Accurate estrus detection is crucial for successful artificial insemination (AI) in cattle.
    • Traditional AI protocols often rely on overt signs of estrus, potentially missing fertile periods.

    Purpose of the Study:

    • To evaluate conception rates in Holstein cows and heifers inseminated after detecting various estrous signs, including subtle ones.
    • To determine the impact of different estrous symptom interpretations on artificial insemination success.

    Main Methods:

    • A retrospective analysis of 732 inseminations in Holstein cows and heifers over 34 months.
    • Categorization of estrous detection methods: standing estrus, mounting activity, and subtle signs (e.g., clear mucus, genital appearance, vocalization).
    • Statistical analysis of conception rates based on estrous detection method, service number, age, ambient temperature, and other factors.

    Main Results:

    • Conception rates were similar for standing estrus (50%) and mounting activity (46%).
    • Inseminations following subtle estrous signs yielded a 33% conception rate, lower than overt signs but still acceptable.
    • Clear mucus during cervical manipulation and factors like service number, age, and temperature influenced conception.

    Conclusions:

    • Acceptable conception rates can be achieved with a more liberal interpretation of estrous symptoms in Holstein cattle.
    • Estrus detection methods, particularly subtle signs, alongside environmental and animal factors, significantly impact artificial insemination fertility.

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