Li S, Sauer W C
Department of Animal Science, University of Alberta, Edmonton, Canada.
J Anim Sci. 1994 Jul;72(7):1737-43. doi: 10.2527/1994.7271737x.
Studies were carried out with 12 pigs (Yorkshire x Landrace) to determine the effect of dietary fat content on amino acid digestibility. The pigs were weaned at 21 d of age and fitted with a simple T-cannula at the distal ileum at 27 or 28 d of age. After a 7-d recuperation period, the pigs were fed one of four isonitrogenous cornstarch-based soybean meal diets (22.5% CP) containing 3.2, 6.2, 9.2, or 12.2% canola oil according to a balanced two-period change-over design. The pigs were fed four times daily, equal amounts, at 6-h intervals. The diets were supplied at a rate of 5% of the average body weight that was determined at the initiation of the first (11.0 kg) and second (12.5 kg) experimental period. Each experimental period consisted of 10 d. Feces were collected for 48 h on d 6 and 7 and ileal digesta for 24 h during d 8, 9, and 10. Chromic oxide was used as digestibility marker. The apparent ileal digestibilities of most of the amino acids increased linearly (P < .05) with increasing dietary fat levels. There were differences (P < .05) in the ileal digestibilities of most of the amino acids between the diets containing 3.2 and 12.2% canola oil. Conversely, the dietary level of inclusion of canola oil did not affect (P > .05) the fecal amino acid digestibilities. The protein-sparing effect of additional canola oil inclusion results, in part, from an increase in ileal amino acid digestibility.
用12头猪（约克夏×长白猪）进行研究，以确定日粮脂肪含量对氨基酸消化率的影响。这些猪在21日龄断奶，并在27或28日龄时在回肠末端安装简单的T型套管。经过7天的恢复期后，根据平衡的两期交叉设计，给猪饲喂四种等氮的基于玉米淀粉的豆粕日粮（粗蛋白含量22.5%）之一，日粮分别含有3.2%、6.2%、9.2%或12.2%的菜籽油。每天给猪饲喂4次，每次等量，间隔6小时。日粮的供给量为第一个（11.0千克）和第二个（12.5千克）实验期开始时测定的平均体重的5%。每个实验期为10天。在第6天和第7天收集48小时的粪便，在第8、9和10天收集24小时的回肠食糜。氧化铬用作消化率标记物。随着日粮脂肪水平的增加，大多数氨基酸的表观回肠消化率呈线性增加（P<0.05）。含3.2%和12.2%菜籽油的日粮之间，大多数氨基酸的回肠消化率存在差异（P<0.05）。相反，菜籽油的日粮添加水平对粪便氨基酸消化率没有影响（P>0.05）。额外添加菜籽油的蛋白质节约效应部分源于回肠氨基酸消化率的提高。
