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After calving, cows go through a period of temporary infertility known as postpartum anestrus. Cows will not experience estrous cycles during this time. Another common term associated with this phenomenon is postpartum interval, which is the time from calving to the subsequent conception. Postpartum interval plays an important role in determining a cow's calving interval, or the number of days from calving date in one year to calving date the next year. To maintain a 365 day calving interval, a cow must have a postpartum interval of 80 – 85 days. If a shorter calving interval is desi...