The effects of three nutrition levels (A1 , 0. 7 × NRC, A2, 0. 8 × NRC, A3 , 0. 9× NRC) in total mixed rations on production performance, apparent digestibility and slaughter performance was evaluated. Forty-eight lambs [SA Mutton Merino(♂) ×Gansu alpine fine wool sheep (♀)] were randomly divided into three groups for a two months feeding trial. The average daily weight gains of the A2 and A3 groups were significantly (P<0. 01) higher than that of the A1 group. There was no significant difference between A2 and A3. The average daily gain of ram lambs was significantly (P<0. 01) higher than that of ewe lambs. Different nutrition levels had significant effects on apparent digestibility of Ca, total phosphorus (TP), neutral detergent fibre (NDF) and acid detergent fiber (ADF) (P<0. 01). Sex factors had significant effects on apparent digestibility of Ca and TP (P<0. 01). There were no difference in slaughter indexes (P>0. 05) but the slaughter rate, cooking rate and loin eye area of hybrid lambs were significantly higher than those of Gansu alpine fine wool sheep. In summary, the 0. 8 × NRC nutritional level was better for fattening hybridized lambs of crossed SA Mutton Merinos, and ram lambs grew better than ewe lambs at the same nutritional levels.%为了研究3种营养水平(A1-0.7×NRC、A2-0.8×NRC、A3-0.9×NRC)全混合日粮对舍饲羔羊生产性能、养分表观消化率和屠宰性状的影响,本试验选择48只南非肉用美利奴×甘肃高山细毛羊杂交一代羔羊,随机分为3个处理组,进行为期60 d的育肥试验.结果显示,在全混合日粮饲喂技术下,饲喂A2、A3营养水平日粮组的羔羊全期平均日增重极显著高于A1营养水平组(P＜0.01),A2和A3营养水平组差异不显著(P＞0.05),公羔全期平均日增重极显著高于母羔(P＜0.01)；A因子对钙、总磷、中性洗涤纤维、酸性洗涤纤维消化率均有极显著影响(P＜0.01),性别仅对钙、总磷消化率有极显著影响(P＜0.01),但营养水平与性别没有显著交互作用(P＞0.05)；营养水平对育肥羔羊的屠宰性能没有显著影响(P＞0.05),但杂种羔羊的屠宰率、熟肉率、眼肌面积等高于甘肃高山细毛羊.以上结果表明采用0.8×NRC营养水平全混合日粮育肥南非肉用美利奴×甘肃高山细毛羊杂交一代羔羊较为适宜,在同一营养水平下,公羔生长性能优于母羔.
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