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Records from both beef and dairy cows were used to test for utero-ovarian relationships during post-partum anoestrus. It was found that ovarian activity (follicular development and ovulation) first occurred in the ovary opposite the side of the recent pregnancy in a significant majority of the observations. This tendency was greater in the dairy cows. The proportion of cows with ovarian activity on the `opposite side' tended to decrease as the length of the interval from calving to ovarian activity increased. However, the average length of the interval from calving to follicular development or ovulation did not differ significantly between `same side' and `opposite side' animals. Cows served at the first ovulation after calving had better conception rates when the ovulation occurred on the side opposite the previous pregnancy. This difference between the two sides was greater for cows whose uteri had not yet involuted at the time of service.

RELATIONSHIPS BETWEEN SIDE OF PREGNANCY AND SIDE OF SUBSEQUENT OVARIAN ACTIVITIES IN BEEF AND DAIRY CATTLE