Estrogen is the hormone that causes a heifer or cow to come into heat.
Source: 2005 North Carolina Dairy Quiz Bowl Junior Division Questions www.cals.ncsu.edu/an_sci/extension/dairy/4-H/quizbowl/quizbowlquestions.htm
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What hormone causes the heifer or cow to come into heat?
Last Updated: August 10, 2007
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