不同蛋白能量水平饲粮对黄渠桥羊羔背最长肌脂肪酸组成及含量的影响

为研究不同蛋白能量水平组合补饲日粮对宁夏地理标志农产品黄渠桥羊羔肉脂肪酸组成及含量的影响，采用随机区组设计，选择出生15 d、体质量10 kg左右的滩寒杂一代羔羊48 只，随机分为4 组，分别饲喂不同蛋白能量水平组合的全价颗粒饲料，羔羊生长体质量达20 kg屠宰后采集分析其背最长肌脂肪酸组成及含量变化。结果表明：实验3组（粗蛋白含量28.17%，代谢能11.79 MJ/kg）羔羊背最长肌多不饱和脂肪酸（polyunsaturated fatty acid，PUFA）与饱和脂肪酸（saturation fatty acid，SFA）比值（P/S）、必需脂肪酸、n-6 PUFA、n-3 PUFA、亚油酸、γ-亚麻酸、α-亚麻酸和二十二碳六烯酸含量较其他组差异显著（P＜0.05），实验1组（粗蛋白含量18.5%，代谢能11.34 MJ/kg）n-6 PUFA与n-3 PUFA比值（n-6/n-3）、花生四烯酸和二十碳五烯酸含量较其他组差异显著（P＜0.05）；综合提示，实验3组和实验1组补饲羔羊背最长肌脂肪酸含量较其他组差异显著。

Effects of Different Dietary Protein and Energy Levels on Longissimus dorsi Fatty Acid Composition in Huangquqiao Lamb Meat

In order to study the effects of dietary supplementation with different protein and energy levels on the fatty acid composition of Huangquqiao lamb meat, a national geographical indication product in Ningxia, according to a randomized block design, 48 fifteen-day-old F1 crossbreds of Tan sheep and small-tailed Han sheep weighting 10 kg were randomly divided into four groups and fed on complete pelleted diets with different protein and energy levels until the body mass reached 20 kg. Then they were slaughtered to collect Longissimus dorsi to analyze fatty acid composition and contents. The results showed that the ratio of polyunsaturated fatty acid (PUFA) to saturated fatty acid (SFA) (P/S), and the contents of essential fatty acid (EFA), n-6 PUFAs, n-3 PUFAs, linoleic acid, γ-linolenic acid, α-linolenic acid and docosahexaenoic acid (DHA) in Longissimus dorsi from Group 3 (28.17% crude protein (CP) + 11.79 MJ/kg metabolic energy (ME)) were significantly different from those in the other groups (P < 0.05), and significant differences in the ratio of n-6 PUFAs to n-3 PUFAs (n-6/n-3), and the content of arachidonic acid and eicosapentaenoic acid (EPA) were seen comparing Group 1 (18.5% CP + 11.34 MJ/kg ME) with the other groups (P < 0.05), indicating that Groups 1 and 3 resulted in a significant difference in fatty acid contents in lamb Longissimus dorsi compared with the other groups.