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Effects of a prostaglandin F2 alpha synchronization program in lactating dairy cattle
M Kristula1, R Bartholomew, D Galligan
1Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, Kennett Square 19348.
Abstract:
A comparison was made between two different methods of reproductive management in the dairy cow. One protocol administered prostaglandin to open cows weekly; the other administered prostaglandin to open cows with a corpus luteum identified by rectal palpation. Survival analysis was used to analyze the data. Cows receiving weekly doses of prostaglandin had a 30% higher pregnancy rate (number of pregnancies per time) than the cows receiving prostaglandin based on rectal palpation of a corpus luteum. The average number of days to first insemination was shorter in cows given prostaglandin weekly.