Glenn Selk, Oklahoma State University Emeritus Extension Animal Scientist — Spring born calves have already been, or soon will be weaned to meet the 45 day requirement for value-added calf sales. A minimum of a 45-day weaning period is recommended to maximize the benefits of pre-conditioning. See the list of sale dates and appropriate weaning dates in the previous article. A balanced nutrition program during this period is critical to ensure profitability for the cow/ calf producer and maximum immune system function during the stressful weaning period and later production phases.

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