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Bulling among yearling feedlot steers
Journal of the American Veterinary Medical Association
|September 1, 1976
Summary
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.
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.