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This depends on the breeding of that heifer. Some heifers that are genetically early maturing or have high fertility will start to experience puberty at around 5 to 6 months of age. Others that are more later maturing or have low fertility won't come into her first heat until she's 18 to 20 months of age.

No matter when a heifer goes into puberty, she can only be bred after she's had 3 or 4 normal heat cycles, when her weight is at least 60% to 65% of the weight of the mature cow herd or of the average mature cow weight of similar breeding to her, or when she is 15 months of age or older.

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