Abstract
The importance of falling progesterone (P4) concentrations in the initiation of parturition and the onset of lactogenesis in many species has long been recognised (Thorburn, et al., 1972). O'Doherty and Crosby (1996) reported a negative linear relationship between P4 concentration at 1 hour post lambing and colostrum yield at 1 h and total yield at 18 h. The administration of progesterone failed to delay parturition when given at a daily dose of 80 mg for a week but larger doses of progesterone (160 mg/day) blocked term labour in most sheep (Bengtsson and Schofield, 1963). The objective of this experiment was to examine the effects of exogenous progesterone administration to ewes in late pregnancy on ewe serum progesterone concentrations, gestation length and colostrum yield and quality.
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