THE INDUCTION AND SYNCHRONIZATION OF LAMBING WITH THE AID OF DEXAMETHASONE

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Abstract
Dexamethasone (8 or 16 mg), injected intramuscularly into ewes of Île-de-France breed at the beginning of the lambing period, induced parturition within a mean of 47·27 hr (±17·28) and 45·04 hr (±12·38) after treatment. With 4 mg, the interval between injection and parturition increased to 80·62 hr (±44·04), compared to 114·31 hr (±44·29) for the controls. No statistical differences were associated with the time of treatment (08.00 or 20.00 hours), but ewes treated at 20.00 hours showed a tendancy to lamb earlier and over a shorter period. For these ewes also, 74·4% of parturitions took place during the day (06.00 to 18.00 hours) whereas the ewes treated at 08.00 hours lambed equally during day and night, as did the controls.

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