SYNCHRONIZATION OF OESTRUS IN DAIRY HEIFERS WITH 6α-METHYL-17α-ACETOXY-PROGESTERONE AND ITS EFFECT ON CONCEPTION RATE
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Since the introduction of 6α-methyl-17α-acetoxyprogesterone (map or medroxy-progesterone acetate) many trials and research projects have been conducted using this orally active progestin. Considerable variation in conception rate following synchronization of oestrus with this compound has been reported (Hansel, 1965; Zimbelman, 1965). The objective of the current study was to evaluate the effect of a specific dosage of map (RepromixR, The Upjohn Company, Michigan) on fertility when administered under specifically controlled conditions.
Forty Holstein heifers, 15 to 18 months of age, were used in this study. These animals, as part of another experiment, were being fed two different types of hay (Hay types A and B) with twenty animals assigned to each group. Ten animals were selected from each group to be recycled while the remaining ten animals from each served as
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