Abstract
SUMMARYThe mating response and lambing outcome in fifty-three sheep was studied after treatment with intravaginal sponges during October (normal breeding season). Bach pessary carried a dose of 30 mg ‘Cronolone’ (9α-fluoro-11β-hydroxy-17α-acetoxyprogesterone; SC-9880, G. D. Searle) in finely dispersed form and was inserted for 14 days. Half the number of pessaries carried an additional dose of 400 mg progesterone. Breeding was by natural service, using 10% rams. Ninety per cent of the fifty ewes bred immediately after treatment conceived; the average number of lambs/conception was 1·9. Sheep treated with ‘Cronolone’/progesterone pessaries showed a marginal and non-significant advantage over those treated with ‘Cronolone’. The application was effective in ensuring the birth of most lambs (87% of total) within a period of 1 week.
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