United States Department of Agriculture, Agriculture Research Service, Southern Plains Agriculture Research Center, Food and Feed Safety research Unit, 2881 F&B Road, College Station, TX 77845, USA.
Bioresour Technol. 2010 Nov;101(21):8469-72. doi: 10.1016/j.biortech.2010.06.010. Epub 2010 Jun 26.
Ruminant-derived foods contain high proportions of saturated fats as a result of ruminal biohydrogenation that rapidly saturates and thus limits the availability of free unsaturated fatty acids for assimilation. The objective of this study was to evaluate the effects of glycerol on ruminal free-fatty acid (FFA) production rates and in vitro fermentation kinetics of alfalfa hay. In vitro incubations demonstrated 48% and 77% reductions in rates of FFA accumulation in incubations supplemented with 2% and 20% glycerol as compared to controls. In vitro incubations with alfalfa hay demonstrated that increasing levels of glycerol did not affect NDF digestibility of the hay. Additionally, increasing amounts of glycerol decreased the acetate to propionate ratio in the rumen. These results suggest that inhibiting bacterial fat degradation may promote ruminal passage of total lipid, thereby providing greater proportions of beneficial unsaturated fat for incorporation into beef products.
反刍动物源性食品含有高脂肪，这是因为瘤胃生物氢化作用迅速饱和，从而限制了游离不饱和脂肪酸的可用性以被吸收。本研究旨在评估甘油对瘤胃游离脂肪酸（FFA）产生率和苜蓿干草体外发酵动力学的影响。与对照组相比，添加 2%和 20%甘油的孵育物中 FFA 积累率分别降低了 48%和 77%。苜蓿干草的体外孵育表明，甘油水平的增加并不影响干草的 NDF 消化率。此外，甘油用量的增加降低了瘤胃中乙酸盐与丙酸盐的比例。这些结果表明，抑制细菌脂肪降解可能会促进总脂质在瘤胃中的通过，从而为牛肉产品提供更大比例的有益不饱和脂肪。
