Demirel G, Ozpinar H, Nazli B, Keser O
Istanbul University, Faculty of Veterinary Medicine, Department of Animal Nutrition of Nutritional Disease, 34320 Istanbul, Turkey.
Meat Sci. 2006 Feb;72(2):229-35. doi: 10.1016/j.meatsci.2005.07.006. Epub 2005 Aug 25.
Lambs from two Turkish breeds, Kivircik a meat breed and Sakiz a breed used for milk and meat production, were fed a diet containing commercial concentrate and hay in the ratios of either 75:25 or 25:75. The effects on fatty acid composition were studied. After weaning (at about 8 weeks) a total of 40 male lambs (20 Kivircik, 20 Sakiz) were divided into four groups of 10 animals and fed either commercial concentrate or grass hay-based diets. The lambs were group fed indoors for 60 days. The mean intramuscular total fatty acid content of longissimus dorsi for Sakiz was lower than that for Kivircik lamb. Increasing the dried grass percentage in the ration decreased the final live weight of the lambs but intramuscular total fatty acid content increased (2088 vs. 1791mg/kg muscle, p<0.001). All n-3 polyunsaturated fatty acids were higher in muscle from lamb fed dried grass-based diets than from lambs fed concentrate-based diets whereas all n-6 were higher in the latter. Polyunsaturated:saturated ratios were higher in the latter animals; 0.26 compared with 0.16 in the lambs fed grass hay. Concentrate groups displayed a higher n-6/n-3 ratio in the same muscle, 7.11 compared with 1.28 in the lambs fed grass. Muscle from Kivircik lambs had higher concentrations of C18:2 n-6 and its metabolite C20:4 n-6 (p<0.001) and also C18:3 n-3.
来自两个土耳其品种的羔羊，肉用品种基尔维吉克（Kivircik）和兼用型品种萨基兹（Sakiz）（用于产奶和产肉），被饲喂含有商业浓缩饲料和干草的日粮，比例分别为75:25或25:75。研究了其对脂肪酸组成的影响。断奶后（约8周龄），将总共40只雄性羔羊（20只基尔维吉克，20只萨基兹）分成四组，每组10只动物，分别饲喂商业浓缩饲料或干草型日粮。羔羊在室内分群饲养60天。萨基兹羔羊背最长肌的平均肌肉总脂肪酸含量低于基尔维吉克羔羊。日粮中干草比例的增加降低了羔羊的最终活重，但肌肉总脂肪酸含量增加（2088对1791mg/kg肌肉，p<0.001）。饲喂干草型日粮的羔羊肌肉中所有n-3多不饱和脂肪酸含量均高于饲喂浓缩饲料型日粮的羔羊，而所有n-6多不饱和脂肪酸含量在后者中更高。后一组动物的多不饱和脂肪酸:饱和脂肪酸比值更高；为0.26，而饲喂干草的羔羊为0.16。浓缩饲料组在同一肌肉中的n-6/n-3比值更高，为7.11，而饲喂干草的羔羊为1.28。基尔维吉克羔羊的肌肉中C18:2 n-6及其代谢产物C20:4 n-6的浓度更高（p<0.001），C18:3 n-3的浓度也更高。
