Hansen B C, Lewis A J
Department of Animal Science, University of Nebraska, Lincoln 68583-0908.
J Anim Sci. 1993 Aug;71(8):2122-32. doi: 10.2527/1993.7182122x.
Three split-plot trials using completely randomized whole-plot designs were conducted to determine the effect of dietary CP level (corn: soybean meal ratio) on daily feed intake, rate and efficiency of gain, and carcass characteristics of growing boars, barrows, and gilts. One hundred eighty-nine pigs were assigned to seven corn-soybean meal diets ranging from 11 to 23% CP in two-percentage-unit increments. The pigs were penned individually and had ad libitum access to feed and water. The average initial weight was 19 kg and the average final weight was 105 kg. Regression analysis revealed that maximal rates and efficiencies of gain were attained by all sexes when animals consumed diets that contained 17 to 19% CP. Average daily gain increased linearly as dietary lysine intake increased from 5 g/d to approximately 25 g/d. Carcass leanness increased at a greater rate for boars than for barrows and gilts (P < .05) as CP levels increased from 11 to 19% CP. The results indicated that both inadequate and excess dietary CP concentrations are detrimental to the rate and efficiency of gain and carcass quality of growing-finishing boars, barrows, and gilts. Interactions between sex and CP level indicated that inadequate CP concentrations were more detrimental to boars than to barrows and gilts.
进行了三项采用完全随机区组设计的裂区试验，以确定日粮粗蛋白水平（玉米：豆粕比例）对生长公猪、阉公猪和后备母猪的日采食量、增重速度和效率以及胴体特性的影响。189头猪被分配到七种玉米 - 豆粕日粮中，粗蛋白水平从11%到23%，以两个百分点的增量递增。猪单独饲养，自由采食和饮水。初始平均体重为19千克，最终平均体重为105千克。回归分析表明，当动物采食含17%至19%粗蛋白的日粮时，所有性别的猪都能达到最大增重速度和效率。随着日粮赖氨酸摄入量从5克/天增加到约25克/天，平均日增重呈线性增加。随着粗蛋白水平从11%增加到19%，公猪胴体瘦肉率的增加速度比阉公猪和后备母猪更快（P <.05）。结果表明，日粮粗蛋白浓度不足和过高均不利于生长育肥公猪、阉公猪和后备母猪的增重速度和效率以及胴体品质。性别与粗蛋白水平之间的相互作用表明，粗蛋白浓度不足对公猪的不利影响大于阉公猪和后备母猪。
