Baloyi J J, Ngongoni N T, Hamudikuwanda H
Department of Animal Science, University of Zimbabwe, P.O. Box MP 167, Mount Pleasant, Harare, Zimbabwe.
Trop Anim Health Prod. 2008 Aug;40(6):457-62. doi: 10.1007/s11250-007-9120-3. Epub 2008 Jan 11.
The effect of feeding forage legumes, Cowpea, Silverleaf desmodium and Oxley fine stem stylo, as protein supplements to natural pasture (veld) hay on intake, growth rate and nitrogen metabolism in growing lambs was evaluated. Thirty growing lambs were stratified according to body weight and randomly assigned, within a stratum, to five diets in a completely randomised design. The diets were veld hay alone (V), veld hay supplemented with either 10 g/kg of urea (VU), veld hay supplemented with 250 g/kg Cowpea (VC), 250 g/kg Silverleaf desmodium (VS) or 250 g/kg Oxley fine stem stylo (VF) forage legume hays. The V and the VU groups were used as control diets. Animals supplemented with either urea or the forage legume had higher (P < 0.01) total dry matter intake compared with the animals on V. The animals supplemented with the forage legumes had higher (P < 0.01) nitrogen intake and faecal nitrogen output than the non-supplemented group. All animals, across the treatments, lost body weight; lambs on V had higher (P < 0.01) body weight losses than those in the other treatments. The forage legume supplemented groups lost less (P < 0.01) body weight than those on the V and VU diets. Although supplementation with forage legumes enhanced feed intake and reduced weight losses it did not maintain body weights of lambs fed a basal diet of poor quality roughages.
评估了将饲料豆科植物豇豆、银叶山蚂蝗和奥克斯利细茎柱花草作为天然牧场（草原）干草的蛋白质补充剂，对生长羔羊的采食量、生长速率和氮代谢的影响。30只生长羔羊按体重分层，并在层内以完全随机设计随机分配到五种日粮中。日粮分别为单独的草原干草（V）、添加10 g/kg尿素的草原干草（VU）、添加250 g/kg豇豆的草原干草（VC）、250 g/kg银叶山蚂蝗的草原干草（VS）或250 g/kg奥克斯利细茎柱花草的饲料豆科植物干草（VF）。V组和VU组用作对照日粮。与V组动物相比，添加尿素或饲料豆科植物的动物总干物质摄入量更高（P<0.01）。与未补充组相比，添加饲料豆科植物的动物氮摄入量和粪便氮排出量更高（P<0.01）。所有处理组的动物体重均下降；V组羔羊的体重损失高于其他处理组（P<0.01）。添加饲料豆科植物的组比V组和VU组的体重损失更少（P<0.01）。尽管添加饲料豆科植物提高了采食量并减少了体重损失，但并不能维持以劣质粗饲料为基础日粮的羔羊体重。
