Written Paper

A study on fattening Ethiopian Sheep: II performance of Adal Lambs on supplemented Grazing.  [1979]

Galal,E.S.E. and Afeworke Tesfazgy and Kassahun Awgichew(Officer and Researchers respectively) Ethiopian Journal of Agricultural Sciences [Corporate Author]

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The study included two trials, each of two phases, to investigate the feasibility of finishing Adal lambs on irrigated pasture and the effect of concentrate supplementation. Fifty-one ram lambs with an initial mean weight of 11.9 kg and mean age of 18 weeks were used in phase 1 Trial I while phase 2 of the same trial had 50 of the lambs used in phase 1 with an average initial weight of 18.3 kg and a mean initial age of 41 weeks. Phase q lasted for 18 weeks while phase 2 lasted for 10 weeks. In phase 1, a concentrate supplement of 300 g/head/day increased average daily gain (P.01), 46 vs. 59 g, although it had no statistically significant effect on final weight. In phase 2 gain was substantially greater than in phase 1. The mean daily gain was 124g with effects due to management in phase 1 and phase 2 (300 vs. 600 g/head/day of concentrate mixture) being absent. Carcass analysis made on eight carcasses, tow from each subclass, showed a carcass weight of 13.4 kg, a dressing percentage of 45.4 , eye-muscle area of 10.9 cm2 fat thickness above the rib-eye muscle of 0.50 cm, kidney fat of 38 g, omental fat of 131 g and tail weight of 1.18 kg. Trial II had 93 ram-lambs in phase 1,60 of which were retained in phase 2. When phase a started t he lambs' mean age was 41 weeks and mean weight 22.8 kg while in phase 2 the corresponding figures were 56 weeks and 32.2 kg. Phase 1 lasted for 6 weeks while phase 2 for 10 weeks. The aim of this trial was to study the fatte
ning performance of the Adal sheep under varying grazing treatments (30,50 and 70- sheep/ha and fallow in phase 1 and 80, 100and 120 sheep /ha and fallow in phase 2) and level of concentrate supplement (none vs 300 g/head/day). Grazing treatment had no effect on gain and final weight in phase 1 while in phase 2 the fallow treatment was generally significantly the highest. The only significant difference between stocking rate was that between the two extremes in phase 2. Supplementation had an effect (P.01) but it was more pronounced in the second phase than the first. Carcass analysis showed Similar trends as those of live weight performance. In Ethiopia, the great majority of sheep marketed for slaughter are milk-tooth lambs ranging in weight between 10 and 18 kg. In the Middle Awash Valley where agricultural. Systems are being intensified and there is the possibility of pasture development such a sheep marketing pattern may be considered a waste of potential lamb growth. This study was carried out to investigate means and feasibility of fattening Adal lambs under a mixture of grazing and concentrate feeding systems and to evaluate the capability of this breed in performing under improved conditions.

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Ethiopian Journal of Agricultural Sciences