羔羊日粮精粗比对其肉及脂肪组织中脂肪酸组成的影响

摘要

This study was performed to evaluate the effects of different forage to concentrate ratios on the quality of Guanghe lambs.Three 6-month-old healthy hybrid lambs (Dorset Sheep ♂ × Small Tail Han Sheep♀) that were weaned and castrated were fed diets with different forage to concentrate ratios and slaughtered in the Guanghe County lamb production area.Samples of the biceps femoris,back longissimus muscle,and biceps and perirenal fat,subcutaneous fat,and tail fat were collected,and the type and content of fatty acids were analyzed using gas chromatography.Thirty-eight types of fatty acids were detected,of which 17 were saturated fatty acids and 21 were unsaturated fatty acids in all the tissues.The fat contents,SFA,PUFA,PUFA/SFA (P/S),PUFA of n3,PUFA of n6,linoleic acid (C18 ∶ 2n6c),and α-linolenic acid (C18 ∶ 3n3),were significantly higher in the lamb fed a diet with the low forage to concentrate ratio than in those fed a diet with the high forage to concentrate ratio (P＜0.05).All tissues of low ratio of forage to concentrate arachidonic acid (C20 ∶ 4) significantly higher than high ratio of forage to concentrate in dietary (P＜0.05).A high ratio of for age to concentrate in the diet of lambs saves production costs and significantly improves and enhances the nutritional value of fatty acids than a low ratio of forage to concentrate.%为了研究不同精粗比日粮对广河羊羔肉品质的影响,在广河县羔羊肉生产区,选择不同精粗比饲喂的6月龄健康陶寒杂交(陶赛特羊♂×小尾寒羊旱)断奶去势公羔各3只进行屠宰,取股二头肌、背最长肌、肱二头肌3个部位肌肉和肾周脂肪、皮下脂肪、尾部脂肪3个部位脂肪,用气象色谱法分析其脂肪酸的种类及含量.结果表明,在所有组织中均检测出38种脂肪酸,其中饱和脂肪酸17种,不饱和脂肪酸21种.脂肪组织中饲喂低精粗比日粮的亚油酸(C18∶2n6c)、α-亚麻酸(C18∶3n3)、饱和脂肪酸(SFA)、多不饱和脂肪酸(PUFA)及其与饱和脂肪酸比值(P/S)、n3系多不饱和脂肪酸和n6系多不饱和脂肪酸均显著高于饲喂高精粗比日粮(P＜0.05);饲喂低精粗比日粮的所有组织中花生四烯酸(C20∶4)的含量显著高于饲喂高精粗比日粮(P＜0.05);与饲喂高精粗比日粮的羊羔肉相比,饲喂低精粗比日粮既节省了生产成本又明显改善和提高了羊羔肉中脂肪酸的营养价值.