Hahn J D, Biehl R R, Baker D H
Department of Animal Sciences, University of Illinois, Urbana 61801, USA.
J Anim Sci. 1995 Mar;73(3):773-84. doi: 10.2527/1995.733773x.
Two hundred sixteen crossbred (PIC line 26 x Camborough 15) pigs were used in three trials to determine optimal digestible lysine levels during early (EF = 50 to 95 kg) and late (LF = 90 to 110 kg) finishing periods. Pigs were self-fed in sex groups of two in all trials. The assay diets for EF and LF periods were 11 and 10% CP corn-soybean meal diets, respectively, supplemented with threonine, methionine, tryptophan, valine, and isoleucine. Corn-soybean meal positive-control diets were included in each trial (14.5% CP for EF and 13.5% CP for LF). This dietary CP regimen was shown to give the same performance and carcass quality as a 17% CP corn-soybean meal diet fed during both EF and LF. Plateau portions of the lysine response curves resulted in performance levels that were equal to or greater than those achieved with pigs fed the 14.5/13.5% CP positive-control diets. Early-finishing pigs responded (P < .05) to graded doses of digestible lysine (.41 to .71%) for daily weight gain, gain:feed, longissimus muscle area, 10th-rib fat depth, lean gain, and plasma urea N. Digestible lysine requirement estimates based on average plateau points were .58% for EF barrows and .64% for EF gilts. Late-finishing pigs responded (P < .05) to digestible lysine doses (.35 to .65%) for daily weight gain, gain:feed, lean gain, and plasma urea N. Digestible lysine requirement estimates based on average plateau points were .49% for LF barrows and .52% for LF gilts.
在三项试验中使用了216头杂交猪（PIC 26系×坎布罗15系），以确定早期（EF = 50至95千克）和后期（LF = 90至110千克）育肥期的最佳可消化赖氨酸水平。在所有试验中，猪按性别每2只为一组自由采食。EF期和LF期的试验日粮分别为11%和10%粗蛋白的玉米-豆粕型日粮，并补充了苏氨酸、蛋氨酸、色氨酸、缬氨酸和异亮氨酸。每次试验都包含玉米-豆粕型阳性对照日粮（EF期为14.5%粗蛋白，LF期为13.5%粗蛋白）。这种日粮粗蛋白方案显示出与在EF期和LF期都饲喂17%粗蛋白玉米-豆粕型日粮相同的生产性能和胴体品质。赖氨酸反应曲线的平台部分所产生的生产性能水平等于或高于饲喂14.5/13.5%粗蛋白阳性对照日粮的猪所达到的水平。早期育肥猪对不同梯度剂量的可消化赖氨酸（0.41%至0.71%）在日增重、料重比、背最长肌面积、第10肋处脂肪厚度、瘦肉增重和血浆尿素氮方面有反应（P < 0.05）。基于平均平台点估计的EF期公猪可消化赖氨酸需求量为0.58%，EF期母猪为0.64%。后期育肥猪对可消化赖氨酸剂量（0.35%至0.65%）在日增重、料重比、瘦肉增重和血浆尿素氮方面有反应（P < 0.05）。基于平均平台点估计的LF期公猪可消化赖氨酸需求量为0.49%，LF期母猪为0.52%。
