St John L C, Young C R, Knabe D A, Thompson L D, Schelling G T, Grundy S M, Smith S B
J Anim Sci. 1987 May;64(5):1441-7. doi: 10.2527/jas1987.6451441x.
Twelve Angus X Hereford steers were assigned to either a control high-energy diet or a test diet consisting of 20% rapeseed at the expense of 20% corn. Twelve pigs were allotted to a control diet and two test diets containing either 10 or 20% canola oil (CO). Both CO and oil in the rapeseed contained 60 to 64% oleic acid. Cattle fed rapeseed exhibited little effect from the diet due to apparent indigestibility of the rapeseed. Total saturated fatty acids decreased from 40% in adipose tissue of the control pigs to 15% in the 20% CO-fed pigs. The ratio of monounsaturated to saturated fatty acids (M/S) increased from 1.19 in adipose tissue from control pigs to 3.63 with the addition of 20% CO to the diet. In muscle, the M/S ratio increased from 1.21 in control pigs to 2.46 in the 20% CO treatment group. The percentage of the saturated fatty acids in muscle decreased from 42% in the control to 23% in the 20% CO treatment. Significant increases in "oiliness" and decreases in fat firmness were observed when increasing levels of canola oil were fed. Sensory traits, cooking loss and shear-force values of pork chops were similar among treatment groups. In conclusion, monounsaturated fatty acid content can be elevated substantially in pork without adversely influencing the quality of the meat, thus producing a product perceived to be more healthful by the consumer.
将12头安格斯×赫里福德阉牛分配到对照高能日粮组或试验日粮组，试验日粮组用20%的油菜籽替代20%的玉米。将12头猪分配到对照日粮组和两种分别含有10%或20%菜籽油（CO）的试验日粮组。菜籽油和油菜籽中的油均含有60%至64%的油酸。由于油菜籽明显难以消化，饲喂油菜籽的牛几乎未受日粮影响。对照猪脂肪组织中的总饱和脂肪酸从40%降至20%菜籽油饲喂组猪的15%。日粮中添加20%菜籽油后，单不饱和脂肪酸与饱和脂肪酸的比例（M/S）从对照猪脂肪组织中的1.19增至3.63。在肌肉中，M/S比例从对照猪的1.21增至20%菜籽油处理组的2.46。肌肉中饱和脂肪酸的百分比从对照组的42%降至20%菜籽油处理组的23%。当饲喂的菜籽油水平增加时，观察到“油腻感”显著增加，脂肪硬度降低。各处理组猪排的感官特性、烹饪损失和剪切力值相似。总之，猪肉中的单不饱和脂肪酸含量可大幅提高，而不会对肉质产生不利影响，从而生产出消费者认为更健康的产品。
