@article{weston_ulberg_1976, title={MANAGING REPRODUCTION IN DAIRY-CATTLE .2. RESPONSE OF COWS TO PROGESTOGEN TREATED HERDMATES DURING POSTPARTUM PERIOD}, volume={59}, ISSN={["0022-0302"]}, DOI={10.3168/jds.S0022-0302(76)84471-2}, abstractNote={Abstract Sixty-eight lactating Holstein cows were handled as one unit but were either fed melengestrol acetate for 14 days or were contemporary controls. Cows that calved in a 21-day period were assigned to a treatment group. Those that calved during the subsequent 21 days served as controls and received no treatment. The alternating assignment was continued for 6 mo. Treated cows were between 14 to 35 days postpartum at the beginning of the feeding period. Data from all cows, combined, showed a decrease in days open (120 to 92) and services per conception (2.7 to 1.5) as compared with their previous year's record. The 34 control cows exhibited estrus over a period which coincided with that of 91% of the treated animals, with a slight delay in occurrence of first estrus. The observations suggest that control cows responded in some way to the treated cows in the early stages of the postpartum period.}, number={11}, journal={JOURNAL OF DAIRY SCIENCE}, author={WESTON, JS and ULBERG, LC}, year={1976}, pages={1985–1988} }