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Related Experiment Videos

Interrelationships with estrous behavior and conception in dairy cattle

A W De Silva, G W Anderson, F C Gwazdauskas

    Journal of Dairy Science
    |December 1, 1981
    PubMed
    Summary

    Estrous detection in cattle is influenced by time of day, housing, and age. Optimal conception rates in cows are linked to lower progesterone levels 12 hours after estrus detection.

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    Area of Science:

    • Animal Science
    • Reproductive Biology
    • Dairy Cattle Management

    Background:

    • Estrus detection is crucial for artificial insemination success in cattle.
    • Understanding factors influencing estrus expression and conception is vital for dairy herd efficiency.

    Purpose of the Study:

    • To evaluate behavioral, productive, environmental, and hormonal factors affecting estrus detection and conception efficiency in cattle.
    • To identify key indicators for optimizing artificial insemination timing.

    Main Methods:

    • 199 inseminations and estrous periods in lactating cows and heifers were analyzed.
    • Cattle were observed twice daily for estrus; blood samples collected at 0 h and 12 h.
    • Estrus activity, hormonal profiles (estradiol, progesterone, luteinizing hormone), and conception rates were assessed.

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    Main Results:

    • Morning estrus detection showed higher activity (11.4 mounts/h) than evening (7.6 mounts/h).
    • Barn-housed cattle exhibited greater estrous activity compared to free-stall or pasture-housed cattle.
    • Estradiol and progesterone influenced late estrus activity; highest conception rates correlated with low progesterone at 12 h.

    Conclusions:

    • Estrus expression and conception efficiency are influenced by time of day, housing, age, and season.
    • Hormonal profiles, particularly progesterone levels at 12 hours post-estrus, are critical indicators for successful insemination.