饲养方式对新疆多浪羊肉品质的影响

分别以戈壁滩放养及工厂集约化饲养的6 月龄多浪羊背最长肌为对象，分析测定不同饲养条件下羊肉的屠 宰性能、pH值、持水力、嫩度、色泽、抗氧化能力、脂肪酸含量、肌原纤维超微结构等指标。结果表明：工厂集 约化饲养组多浪羊肉的嫩度、成熟7 d的亮度值和脂肪酸总量优于戈壁滩放养组（P＜0.05），而戈壁滩放养组多浪 羊肉的持水力、抗氧化能力、宰后1 d的红度值及多不饱和脂肪酸含量优于工厂集约化饲养组（P＜0.05）；工厂集 约化饲养组多浪羊肉肌原纤维密度较大、直径小，肌原纤维之间排列紧密；而戈壁滩放养组的多浪羊肉肌原纤维密 度小、直径大，肌原纤维之间空隙较大。两种饲养方式各有优势，在生产中可考虑结合已有的饲养条件加以完善， 以生产出更优质的羊肉。

Effects of Different Feeding Modes on Meat Quality of Duolang Sheep

The longissimus dorsi muscles of Duolang sheep slaughtered at the age of 6 months in factory farming and Gobi desert stocking were used to investigate the differences in slaughter performance, pH, water-holding capacity (WHC), tenderness, color, antioxidant ability, fatty acid content and the ultrastructure of myofibrils. The results showed that the tenderness, lightness after 7 days of maturation and total fatty acids in the factory farming group were better than those in the Gobi desert stocking group (P < 0.05). The WHC, antioxidant ability, redness at day 1 postmortem and polyunsaturated fatty acids in the Gobi desert stocking group were better than those in the factory farming group (P < 0.05). Compared with the Gobi desert stocking group, bigger myofibril density, smaller myofibril diameter and closer myofibril arrangement were observed for the factory farming group. In conclusion, both feeding modes have their own advantages for the meat quality of Duolang sheep and in actual practice, the existing feeding conditions should be improved for producing high-quality mutton.