Analysis of lambing trials with Merino ewes has shown a highly significant association between pre-mating liveweight and lambing performance.
With May-June lambing ewes there was a 2.9 per cent, lambing increase for every extra 10 lb. liveweight; for July-August- September lambing ewes there was a 6.9 per cent, increase for every 10 lb. liveweight increase.
With the May-June lambing there was a critical weight below which twinning was negligible
