Glenn Selk, Oklahoma State University Emeritus Extension Animal Scientist — Calculating the amount of
hay that is needed on both a short term and over the course of an entire winter are mathematical exercises that
are required on any cow calf enterprise. There are scientifically based “rules-of-thumb” that can make these
mathematical exercises more precise. The size of the cow, the lactation status of the cow, and the quality of the
forage are key elements in determining the average daily intake of the cow.

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