Lough D S, Solomon M B, Rumsey T S, Elsasser T H, Slyter L L, Kahl S, Lynch G P
Livestock and Poultry Sciences Institute, ARS, U.S. Department of Agriculture, Beltsville, MD 20705-2350.
J Anim Sci. 1992 Apr;70(4):1153-8. doi: 10.2527/1992.7041153x.
Phospholipids (soy lecithin) are important in the emulsification of lipids and may escape the rumen and influence the absorption of fatty acids in the small intestine. Our objectives were to determine the influence of dietary canola seed (high in unsaturated fatty acids) and soy lecithin in high-forage diets on total lipid content, cholesterol content, and fatty acid composition of carcass tissues. Forty-three Hampshire or Suffolk-sired ram lambs were weaned at 60 d of age (average 23.6 kg of BW) and assigned to a 2 x 2 factorial arrangement of treatments consisting of 1) basal diet (control = BAS), 2) BAS with 6% whole canola seed (CS), 3) BAS with 4.9% deoiled soy lecithin (SL), and 4) BAS with 6% CS and 4.8% SL (CSSL). The BAS diet consisted of 70% forage and 30% concentrate and contained 15% CP and 2.2 Mcal of ME/kg. Lambs were individually fed and given ad libitum access to feed to an average final BW of 52.1 kg. Longissimus muscle (LM) from the left side of each carcass posterior to the 13th rib (12 to 15 cm in length) was excised and the lean (LM) and corresponding subcutaneous (s.c.) adipose tissue were separated, frozen, and later used for lipid analysis by gas-liquid chromatography. In lean tissue, feeding lambs CS reduced (P less than .01) the proportion of total polyunsaturated fatty acids (PUFA) and feeding SL increased (P less than .01) the proportion of total PUFA. In s.c. adipose tissue, lambs fed CS had lower (P less than .01) saturated fatty acids (SFA) and lambs fed SL had increased (P less than .03) PUFA.(ABSTRACT TRUNCATED AT 250 WORDS)
磷脂（大豆卵磷脂）在脂质乳化过程中很重要，可能会逃过瘤胃并影响小肠中脂肪酸的吸收。我们的目标是确定高粗饲料日粮中添加油菜籽（富含不饱和脂肪酸）和大豆卵磷脂对胴体组织的总脂质含量、胆固醇含量和脂肪酸组成的影响。43只汉普夏或萨福克父系的公羔羊在60日龄断奶（平均体重23.6千克），并被分配到2×2析因试验设计的处理组中，处理组包括：1）基础日粮（对照 = BAS），2）添加6%全油菜籽的BAS（CS），3）添加4.9%脱油大豆卵磷脂的BAS（SL），4）添加6% CS和4.8% SL的BAS（CSSL）。BAS日粮由70%粗饲料和30%精饲料组成，含有15%粗蛋白和每千克2.2兆卡代谢能。羔羊单独饲养，自由采食，平均最终体重达到52.1千克。从每只胴体第13肋骨后方左侧切取长肌（LM，长12至15厘米），分离出瘦肉（LM）和相应的皮下（s.c.）脂肪组织，冷冻后用于气液色谱法进行脂质分析。在瘦肉组织中，给羔羊饲喂CS会降低（P < 0.01）总多不饱和脂肪酸（PUFA）的比例，而饲喂SL会增加（P < 0.01）总PUFA的比例。在皮下脂肪组织中，饲喂CS的羔羊饱和脂肪酸（SFA）含量较低（P < 0.01），饲喂SL的羔羊PUFA含量增加（P < 0.03）。（摘要截选至250词）
