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A heifer usually won't start to cycle until she is around 10 months old. (not uncommon to be sooner) And at around 14 months they will become pretty regular at every 21 days. However if kept with a bull they can be bred when they come in heat the first time. I do not suggest anyone do this cause most heifers at 10 months are too small and serious complications can occur during pregnancy. I would wait atleast till 15 or 16 months to allow the pelvic bone to have the extra 5 to 6 months growth at birthing time.

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16y ago

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