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):694-707. doi: 10.2527/1991.692694x.
The relationships between dietary amino acids and DE for pigs weighing 20 to 50 kg were investigated in two experiments. 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, the effects of six lysine:DE ratios (1.90 to 3.90 g/Mcal) at two DE levels (3.25 and 3.75 Mcal/kg) were investigated. In both experiments, diets were formulated using a constant ratio of corn and soybean meal. Pigs (equal numbers of barrows and gilts) were housed and fed individually and had ad libitum access to feed and water. Digestible energy intake was not affected by energy content of the diets. In Exp. 1, lysine intake did not differ with DE in the adjusted diets but decreased (P less than .001) as DE increased in the unadjusted diets. Weight gain was relatively consistent and gain:DE intake increased (P less than .001) as DE increased in the adjusted diets, but both decreased (P less than .005) with increasing DE in the unadjusted diets. Both criteria increased (P less than .001) in response to higher lysine:DE in the adjusted and lysine in the unadjusted diets. In Exp. 2, weight gain increased (P less than .005), but there was no effect (P greater than .05) on gain:DE intake as DE increased. Both weight gain and gain:DE intake increased (P less than .001) and backfat decreased (P less than .01) as lysine:DE ratios increased. The results demonstrate the need to increase dietary amino acid levels in concert with increases in energy contents. Regression analyses indicated that weight gain and gain:DE intake for 20- to 50-kg pigs were maximized at approximately 3.0 g lysine/Mcal DE (or 49 g of balanced protein/Mcal DE).
在两项试验中研究了体重20至50千克猪的日粮氨基酸与消化能（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DE水平（3.00至4.00兆卡/千克）进行了调整（1.50、2.35和3.20克/兆卡DE），或者针对三个DE水平（3.50至4.00兆卡/千克）未进行调整（日粮的0.45%、0.71%和0.96%）。在试验2中，研究了两个DE水平（3.25和3.75兆卡/千克）下六个赖氨酸:DE比率（1.90至3.90克/兆卡）的影响。在两项试验中，日粮均以玉米和豆粕的固定比例配制。猪（公猪和母猪数量相等）单独饲养和喂食，自由采食饲料和饮水。日粮的能量含量不影响可消化能量摄入量。在试验1中，在调整后的日粮中赖氨酸摄入量不随DE而变化，但在未调整的日粮中随着DE增加而降低（P小于0.001）。增重相对一致，在调整后的日粮中随着DE增加增重:DE摄入量增加（P小于0.001），但在未调整的日粮中随着DE增加两者均降低（P小于0.005）。在调整后的日粮中随着赖氨酸:DE升高以及在未调整的日粮中随着赖氨酸升高，两个标准均升高（P小于0.001）。在试验2中，随着DE增加增重增加（P小于0.005），但对增重:DE摄入量没有影响（P大于0.05）。随着赖氨酸:DE比率增加，增重和增重:DE摄入量均增加（P小于0.001），背膘减少（P小于0.01）。结果表明需要随着能量含量增加同步提高日粮氨基酸水平。回归分析表明，20至50千克猪的增重和增重:DE摄入量在约3.0克赖氨酸/兆卡DE（或49克平衡蛋白质/兆卡DE）时达到最大值。
