The effect of early weaning one of a pair of twins on the growth of lambs
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概要
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Twenty-two sets of Suffolk ewes and their lambs were maintained indoors for 120 days <I>post partum</I>. Seven ewes giving birth to twin lambs were grouped into two pens, and each set of twin lambs sucked its dam from birth until the group average time of 120 days (T-T). Eight ewes giving birth to twin lambs were grouped into two pens. In these sets of twin lambs, the larger one of each set was weaned at 60 days of age, and the other was left as a single lamb with the ewe (T-S). The lambs weaned at 60 days were grouped into two pens (T-W). Seven ewes giving birth to single lambs were grouped into two pens, and each single lamb sucked its dam from birth until 120 days of age (S-S). Ewes were fed formula feed for raising dairy cattle together with hay to meet the ewe's requirements for CP and TDN (NRC, 1985). T-S ewes consumed less formula feed than T-T ewes after 61 days of lactation. Lambs were creep-fed calf starter together with hay from 10 days of age. Formula feed gradually replaced calf starter from 56 to 60 days of age. From 61 days onwards, all lambs were fed formula feed of 1 kg on an as-fed basis per head per day.<BR>The average live weight of T-T lambs reached 51.2 kg at 120 days of age. Hay intake in T-W lambs was higher (p < 0.05) than in T-S lambs, although T-W lambs had a lower (p < 0.05) average daily gain during 61 to 90 days of age. Average live weights at 120 days of age were similar between T-S and T-W lambs. Considerable variation (14%) between individual T-T lambs occurred in live weight at 120 days. A reduction in variation of live weight at 120 days was shown by T-S lambs (5%) and T-W lambs (8%). The average live weight of S-S lambs reached 45.6 kg at 90 days of age.<BR>In Japan, lambs are slaughtered over a range of live weights varying from 43 to 53 kg. Lambs weaned at 60 days of age suffered a check in growth at weaning but recovered sufficiently to reach slaughter weight compared to that of twins left with ewes and twins sucking their dams. The technique of early weaning one of a pair of twins can provide a ready means of saving feed for ewes.
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