Voerstelsels vir superlamproduksie

Author: A.J. van Heerden en J. Reyneke
Year: 1974
Issue: 2
Volume: 4
Page: 121 - 125

Eighty Dohne Merino lambs were divided into 4 groups to investigate the effect of different succulent feeds and concentrates given to ewes and lambs on veld grazing. From the time of lambing ewes received the following supplementary rations per head daily: Group 1 :2,72 kg maize silage +0,68 concentrate I, Group 2 : 9,09 kg Japanese radish + 0,45 kg concentrate II, Group 3 : 4,54 kg succulent pasture grazing (for two hours) daily and Group 4 : 1,13 kg concentrate I. Half of the lambs were weaned at 8 weeks of age and received one of the following rations per lamb per day: Group 1 : 0,45 kg maize silage, Group 2 : 0,45 kg Japanese radish, Group 3 : 2,2 kg succulent pasture grazing (for two hours daily) and Group 4 : no succulent feed. The rest of the lambs remained with their dams till the ram lambs could be slaughtered at a live mass of 32 kg. Limited creep feed was available to all lambs from an age of six weeks. Early weaned lambs of all groups took about three weeks longer (P< 0,01) to reach slaU8hter mass than did unweaned lambs. Both weaning treatments on the succulent pasture had a faster (P< 0,01) rate of mass gain than did the other treatments and these lambs could thus be slaughtered earlier. Maize silage and Japanese radish proved to be suitable substitutes for winter cereal pasture for early weaned lambs but not for unweaned lambs. Carcass score of the unweaned lambs of the radish and concentrate groups were significantly (P< 0.05) higher than those for the early weaned groups. For the winter cereal pasture groups the opposite was true. Ewes of the early weaned groups maintained their live mass while ewes of the unweaned groups showed a slight gain in live mass during lactation. Results showed that feeding costs of groups which received supplementary concentrates, were considerably higher than those which received no concentrates. Considering that ewes on green feed were not allowed concentrates, and because of the faster rate of live mass gain of unweaned lambs on winter cereal pasture, feeding costs were lower for the unweaned group.

 

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