Lough D S, Solomon M B, Rumsey T S, Elsasser T H, Slyter L L, Kahl S, Lynch G P
Agricultural Research Service, U.S. Department of Agriculture, Beltsville, MD 20705.
J Anim Sci. 1991 Aug;69(8):3292-8. doi: 10.2527/1991.6983292x.
Phospholipids (soy lecithin) are important in the emulsification of lipids and may be able to escape the rumen and influence the absorption of fatty acids in the small intestine. The objectives of this study were to determine the influence of dietary canola seed (high in unsaturated fatty acids) and soy lecithin in high-forage diets on performance, serum lipid metabolites, and carcass characteristics of growing ram lambs. Forty-three Hampshire- or Suffolk-sired ram lambs were weaned at 60 d of age (average 23.6 kg BW) and assigned to a 2 x 2 factorial arrangement of the following treatments (% of DM): 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 had ad libitum access to their diet to an average final BW of 52.1 kg. Lambs were bled by jugular venipuncture on d 0, at 4-wk intervals, and 1 d before slaughter. Dry matter intake was not affected by treatment; however, energy intake (Mcal of ME/d) was greater (P less than .01) for lambs fed SL. Feeding SL and(or) CS to growing ram lambs increased (P less than .02) serum lipid concentrations. Carcasses from lambs fed SL were fatter, as evidenced by greater dressing percentage and subcutaneous fat thickness. Feeding CS to growing lambs had little effect on performance and carcass characteristics compared with feeding SL, which resulted in greater energy intake and fatter carcasses.(ABSTRACT TRUNCATED AT 250 WORDS)
磷脂（大豆卵磷脂）在脂质乳化过程中起着重要作用，并且可能能够逃过瘤胃，进而影响小肠中脂肪酸的吸收。本研究的目的是确定在高粗饲料日粮中添加油菜籽（富含不饱和脂肪酸）和大豆卵磷脂对生长中的公羔羊的生产性能、血脂代谢产物以及胴体特性的影响。43只汉普夏或萨福克父系的公羔羊在60日龄（平均体重23.6千克）时断奶，并按照2×2析因设计分配到以下处理组（占干物质的百分比）：1）基础日粮（对照组 = BAS）；2）添加6%整粒油菜籽的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%的粗蛋白和每千克2.2兆卡的代谢能。羔羊可自由采食日粮，直至平均最终体重达到52.1千克。在第0天、每隔4周以及屠宰前1天通过颈静脉穿刺采集羔羊血液。干物质摄入量不受处理的影响；然而，饲喂SL的羔羊能量摄入量（每d代谢能兆卡数）更高（P < 0.01）。给生长中的公羔羊饲喂SL和（或）CS会提高（P < 0.02）血脂浓度。饲喂SL的羔羊胴体更肥，屠宰率和皮下脂肪厚度更高就证明了这一点。与饲喂SL相比，给生长中的羔羊饲喂CS对生产性能和胴体特性影响较小，饲喂SL导致更高的能量摄入量和更肥的胴体。（摘要截短至250字）
