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A spayed heifer is a young female bovine past weaned age that has had her ovaries surgically removed so that she is unable to be fertile or reproductively receptive to a bull (which is called heat or estrus.) The purpose of this is to manage heifers that are only to be used for beef production, not as replacement females, but in such a way that they do not need to be regularly injected with hormones to prevent them from going into heat. This is especially useful when they are being raised on pasture for a backgrounding operation when it is not cost effective, both in labour and input costs as well as stress for the heifers and the people, to be implanting or injecting hormones all the time.

In the feedlot, heifers are fed a hormone called MGA that prevents them from going into regular estrus. If they are stopped fed this hormone, they go into estrus almost immediately. Spaying them prevents this from happening.

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What is the feminine name of cattle?

Cow, first-calf heifer, bred heifer, heifer, heifer calf or spayed heifer. See the related question below.


What is a female castrated cow called?

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