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Effects of Oxytocin upon the Reproductive Tract of the Lactating Bovine¹

Dairy Department, University of Georgia, Athens

ABSTRACT

Twenty-four lactating, multiparous Holstein and Jersey cows were used in the study. Twelve cows were injected with 200 and 150 USP units, respectively, of oxytocin (P.O.P.) for 42 days; the other 12 cows received nothing and served as controls. Average intervals from parturition to uterine involution were 41.0 and 42.7 days; to ovulation, 27.5 and 24.7 days; to first estrus, 41.3 and 40.9 days, for the treated and untreated groups, respectively. Daily injections of 400 USP units of P.O.P. from Day 0–4, inclusive, of the estrous cycle had no effect upon the langth of diestrus in 13 multiparous, lactating Holstein cows. Conception rates were not affected by treatments.

¹ Journal Paper No. 328 of the College Experiment Station of the University of Georgia College of Agriculture Experiment Stations.