脂肪生物有效能值的测定  

DETERMINATION OF THE BIOLOGICALEFFECTIVE ENERGY VALUES OF FATS

作　　者：于会民[1] 李德发[1] 管武太[1] 张国龙[1] 王凤来[1] 

机构地区：[1]中国农业大学动物科技学院

出　　处：《动物营养学报》1999年第1期25-31,共7页CHINESE JOURNAL OF ANIMAL NUTRITION

摘　　要：本试验方法测定的有效能值不同于传统的代谢能值，是基于生长反应来测定的，实为生长效应能值。试验利用１～３和４～６周龄的肉仔鸡测定不同脂肪来源在不同添加水平下的能量贡献。在低能基础日粮中添加５％、１０％和１５％的葡萄糖或将豆油、黄油和牛脂三种脂肪，１～３周以１％和２％、４～６周以１．５％和３％两个水平添加到基础日粮中。通过脂肪添加组与葡萄糖组生长性能对照，根据生长性能相等的原则得出每一脂肪添加水平相应的葡萄糖水平，根据葡萄糖代谢能值（３．６４ｋｃａｌ／ｇ干物质）求出脂肪的能值。试验结果表明：黄油和牛脂在低水平（１％～１．５％）添加时其有效能值超出总能值（９．４ｋｃａｌ／ｇ），其有效能值随着添加水平的提高而下降，而且饱和度越高下降愈明显；但对豆油而言，当添加水平在较小范围内（１％～３％）变化时其能值未见下降。The energy contribution of different dietary fat sources in broiler diets at varying inclusion rates was determined.The effective energy values(EEV)determined by this experimental method differ from the traditional metabolizable energy values as they are the actual growth response energy values calculated from the growth response to dietary fat addition.During weeks 1 to 3,soybean oil,yellow grease or beef tallow were added to the low energy basal diet at an inclusion rates of 1% or 2% of the basal diet and during weeks 4 to 6, the fats were added at inclusion rates of 1.5% and 3%.Broiler performance on the diets with added fat were compared with the performance on the basal diet plus 0,5%,10% and 15% glucose.The level of glucose addition required to produce a similar growth response as each level of fat inclusion was calculated.The effective energy value(EEV) of each fat level at each inclusion level was then determined based upon a standard ME value of 3.64 kcal/g(dry matter basis)for glucose. The results showed that the EEV of yellow grease and beef tallow at the lower supplementation levels(1%&1.5%)were greater than their respective gross energy contents.The EEV of yellow grease and beef tallow decreased with increasing levels of supplementation,with the more highly saturated fat(beef tallow)showing a more rapid decrease in EEV as inclusion rate increased.No decrease in EEV with increasing inclusion rate was observed for soybean oil over a narrow range of inclusion rates(1% to 3%)

关 键 词：脂肪 代谢 饲料 豆油 黄油 牛脂 有效能值 

分 类 号：Q591.5[生物学—生物化学] S816.4[农业科学—饲料科学]