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Timely Topic
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Interactions Between Nutrition and Reproduction in Beef Cows
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Following is a brief summary of key management strategies he presented (Hall, J.B. 2005. Proc. Applied Reproductive Strategies in Beef Cattle, Nov. 1-2, 2005, Lexington, KY).
- Ensure sufficient energy is available to support reproduction.
- Body condition score (BCS) females and achieve BCS 5 in cows and BCS 6 in heifers by calving time (latest) or 60 days before calving (preferred).
- Maintain body condition from calving through breeding for cows in proper body condition, and increase body condition in cows that are below optimal BCS at calving.
- Feed thin cows and first-calf heifers in separate group(s) from the main herd.
- Provide energy supplementation from the most economical local source in order to minimize costs.
- Provide optimum level of dietary protein.
- Rather than balancing diets on crude protein (CP), balance diets on metabolizable protein (MP), if possible, which is a measure of the protein reaching and absorbed by the small intestine.
- Provide sufficient digestible intake protein (DIP) for adequate rumen function, especially in females on medium to low quality forages.
- Avoid over-supplementation of protein, which may reduce pregnancy rates.
- Inclusion of by-pass or undegradable intake protein (UIP) may not prove to be effective.
- If possible, include ionophores (e.g., Rumensin® or Bovatec®) in the diet, which can help decrease postpartum intervals in mature cows and first-calf heifers.
- Base mineral supplementation on forage mineral content and local mineral deficiencies.
- Supplement phosphorus only when needed.
- Pay attention to trace mineral levels, especially copper, selenium, manganese, and zinc.
[May 4th, 2006]
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Dr. Rick Rasby, Professor of Animal Science
Animal Science, University of Nebraska - Lincoln, Lincoln, NE
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