Cloprostenol and Dinoprost Tromethamine in Experimental and Field Trials Treating Unobserved Estrus in Dairy Cows

Abstract

There was little difference in the luteolytic activity of cloprostenol (0.5 mg) and dinoprost tromethamine (25 mg) when tested in controlled experimental conditions (65 cows) and in a field trial (245 cows). However, the experimental cows showed a better oestrus response (92.7% against 65.7%) and better pregnancy rate (55.1% against 33.5%) within 6 days of treatment than the cows in the field trial. Palpation accuracy and stage of dioestrus at treatment had a greater effect on the results than the type of prostaglandin used.