Abstract
Abstract Ninety-six Romney ewe hoggets from a group of 236 hoggets of known history were treated with intra-vaginal sponges containing 20 mg or 60 mg methyl-acetoxy-progesterone (MAP) for 14 days near the onset of the breeding season. Observations were made for oestrus in all hoggets and for ovulations in a sample of animals from each group. After treatment the amount of MAP “absorbed” from each sponge was chemically determined. The effects of sire, birth rank of hoggets, dose level of MAP, and occurrence of oestrus on the amount of MAP “absorbed” were estimated. The incidence of oestrus within seven days of sponge withdrawal was 62%, and its occurrence was similar for both dose levels of MAP. The numbers of ovulations in treated hoggets were normal.
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