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Bulling among yearling feedlot steers

R E Pierson, R Jensen, P M Braddy

    Journal of the American Veterinary Medical Association
    |September 1, 1976
    PubMed
    Summary
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    Bulling in feedlot cattle, a behavior where steers mount others, caused significant economic losses. Hormones in feed or implants were identified as key contributors to this issue.

    Area of Science:

    • Veterinary Medicine
    • Animal Science
    • Agricultural Economics

    Background:

    • Bulling behavior in feedlot cattle presents a significant challenge to animal health and economic viability.
    • Previous studies have indicated potential links between hormonal treatments and the manifestation of bulling.

    Purpose of the Study:

    • To investigate the prevalence and causes of bulling among yearling feedlot cattle.
    • To quantify the economic impact of bulling-related illnesses and deaths.

    Main Methods:

    • A survey was conducted to identify the primary causes of illness and mortality in feedlot cattle.
    • Data analysis included cattle inventory, bulling incidence, and necropsy results from 1971-1974.
    • Hormonal treatments (implants and feed additives) were examined as potential etiological factors.

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    Main Results:

    • Bulling affected 54,913 steers (2.88%) between 1971-1974, resulting in annual losses of approximately $325,000.
    • Hormones, administered via implants or feed, were identified as significant contributing factors to bulling.
    • In 1974, necropsies revealed 83 steer deaths directly attributed to injuries sustained from riding during bulling incidents.

    Conclusions:

    • Bulling is a major health and economic concern in feedlot operations.
    • Hormonal influences are strongly implicated in the development of bulling behavior.
    • Management strategies addressing hormonal use and potential riding injuries are crucial for mitigating losses.