Chiba L I, Lewis A J, Peo E R
Dept. of Anim. Sci., University of Nebraska, Lincoln 68583-0908.
J Anim Sci. 1991 Feb;69(2):708-18. doi: 10.2527/1991.692708x.
Two experiments were conducted to investigate the relationships between amino acids and DE for pigs weighing 20 to 50 kg. In Exp. 1, there were three dietary lysine levels that were either adjusted (1.50, 2.35 and 3.20 g/Mcal DE) for five DE levels (3.00 to 4.00 Mcal/kg) or unadjusted (.45, .71 and .96% of the diet) for three DE levels (3.50 to 4.00 Mcal/kg). In Exp. 2, diets containing six lysine:DE ratios (1.90 to 3.90 g/Mcal) at two DE levels (3.25 and 3.75 Mcal/kg) were fed. Pigs were housed individually, and could eat and drink ad libitum. When pigs weighed 50 kg, their empty body composition was determined by the urea dilution technique in Exp. 1 and by prediction equations based on backfat in Exp. 2. For the adjusted diets in Exp. 1, protein deposition and protein deposition:DE intake increased (P less than .01) slightly as DE levels increased. These criteria decreased linearly (P less than .001), and fat deposition increased (P = .11) as DE increased when lysine:DE ratios were not maintained. As lysine levels increased, protein deposition and protein deposition: DE intake increased (P less than .001) in both the adjusted and unadjusted diets. In Exp. 2, there was no effect of DE on either the rate or efficiency of protein deposition. Both protein deposition and protein deposition:DE intake increased (P less than .001) and fat deposition decreased as lysine:DE ratios increased up to 3.00 g lysine/Mcal DE. Protein deposition: lysine intake decreased (P less than .01) progressively as the lysine:DE ratio increased. Regression analyses indicated the protein deposition increased up to 3.00 g lysine/Mcal DE. The results demonstrate the need to adjust lysine according to energy levels and indicate that the optimum ratio for protein deposition was approximately 3.00 g lysine/Mcal DE (or 49 g of balanced protein/Mcal DE).
进行了两项试验，以研究体重20至50千克猪的氨基酸与消化能（DE）之间的关系。在试验1中，有三种日粮赖氨酸水平，针对五个消化能水平（3.00至4.00兆卡/千克）进行了调整（分别为1.50、2.35和3.20克/兆卡消化能），或针对三个消化能水平（3.50至4.00兆卡/千克）未作调整（分别为日粮的0.45%、0.71%和0.96%）。在试验2中，饲喂了含有六种赖氨酸:消化能比率（1.90至3.90克/兆卡）的日粮，消化能水平为两个（3.25和3.75兆卡/千克）。猪单独饲养，可自由采食和饮水。当猪体重达50千克时，在试验1中通过尿素稀释技术、在试验2中通过基于背膘厚的预测方程测定其空体组成。对于试验1中的调整日粮，随着消化能水平升高，蛋白质沉积及蛋白质沉积:消化能摄入量略有增加（P<0.01）。当赖氨酸:消化能比率未维持时，随着消化能增加，这些指标呈线性下降（P<0.001），脂肪沉积增加（P=0.11）。随着赖氨酸水平升高，调整和未调整日粮中的蛋白质沉积及蛋白质沉积:消化能摄入量均增加（P<0.001）。在试验2中，消化能对蛋白质沉积的速率或效率均无影响。随着赖氨酸:消化能比率增加至3.00克赖氨酸/兆卡消化能，蛋白质沉积及蛋白质沉积:消化能摄入量均增加（P<0.001），脂肪沉积减少。随着赖氨酸:消化能比率增加，蛋白质沉积:赖氨酸摄入量逐渐下降（P<0.01）。回归分析表明，蛋白质沉积增加至3.00克赖氨酸/兆卡消化能。结果表明需要根据能量水平调整赖氨酸，并表明蛋白质沉积的最佳比率约为3.00克赖氨酸/兆卡消化能（或49克平衡蛋白质/兆卡消化能）。
