Merck Manual

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Cow-calf pair, Beef Shorthorn
Cow-calf pair, Beef Shorthorn

    Beef Shorthorn cow-calf pair at pasture. Suckling by beef calves, as pictured here, results in "lactational anestrus," during which energy resources are prioritized for milk production to nourish rapidly growing young calves, rather than for ovarian follicle production.

    Courtesy of Dr. Jonathan Statham.