Hansen J A, Knabe D A, Burgoon K G
Department of Animal Science, Texas A&M University, College Station 77843.
J Anim Sci. 1993 Feb;71(2):452-8. doi: 10.2527/1993.712452x.
Four growth experiments were conducted to determine the value of added threonine (Thr), methionine (Met), tryptophan (Trp), and isoleucine (Ile) in low-protein, lysine (Lys)-fortified, sorghum-soybean meal diets for starting pigs weaned at 28 d. Trials lasted 28 d and average initial weight was approximately 6.5 kg. A 21% CP (1.15% total and .95% digestible Lys) diet was included in all trials. Basal 15, 17, and 19% CP diets were formulated to contain .95% digestible Lys by adding .38, .26, and .13% Lys, respectively. In Exp. 1, the additions of either Thr (.27%) or Met (.08%) to the 15% CP diet improved (P < .05) ADG and gain/feed (G/F); Trp (.04%) and Ile (.05%) additions had no effect. None of the 15% CP diets resulted in performance comparable to that obtained on the 21% CP diet. In Exp. 2, 19 and 17% CP diets fortified with Thr, Met, and Trp to obtain the digestible contents of the 21% CP diet produced performance equal to performance on the 21% CP diet. Results of Exp. 3 indicate that Thr (.11%) and Met (.08%) supplementation of the 17% CP diet were needed to maximize performance; Trp and Ile additions were not beneficial. Results of the final experiment suggested that Thr and Met additions to the 17% CP diet could be reduced to .05 and .04%, respectively, without lowering performance. These data indicate that a 17% CP, sorghum-soybean meal diet fortified with Lys, Met, and Thr can produce performance equal to that obtained by pigs fed a 21% CP diet.
进行了四项生长试验，以确定在低蛋白、添加赖氨酸（Lys）的高粱-豆粕日粮中添加苏氨酸（Thr）、蛋氨酸（Met）、色氨酸（Trp）和异亮氨酸（Ile）对28日龄断奶仔猪的价值。试验持续28天，平均初始体重约为6.5千克。所有试验均包含一种21%粗蛋白（总赖氨酸1.15%，可消化赖氨酸0.95%）的日粮。基础日粮为15%、17%和19%粗蛋白，通过分别添加0.38%、0.26%和0.13%的赖氨酸，使其可消化赖氨酸含量达到0.95%。在试验1中，在15%粗蛋白日粮中添加苏氨酸（0.27%）或蛋氨酸（0.08%）可提高（P < 0.05）平均日增重（ADG）和增重/采食量（G/F）；添加色氨酸（0.04%）和异亮氨酸（0.05%）则无效果。15%粗蛋白的日粮均未产生与21%粗蛋白日粮相当的生长性能。在试验2中，用苏氨酸、蛋氨酸和色氨酸强化19%和17%粗蛋白日粮，使其可消化成分达到21%粗蛋白日粮的水平，其生长性能与21%粗蛋白日粮相当。试验3的结果表明，在17%粗蛋白日粮中添加苏氨酸（0.11%）和蛋氨酸（0.08%）可使生长性能最大化；添加色氨酸和异亮氨酸并无益处。最后一项试验的结果表明，在17%粗蛋白日粮中添加苏氨酸和蛋氨酸的量可分别降至0.05%和0.04%，而不会降低生长性能。这些数据表明，添加赖氨酸、蛋氨酸和苏氨酸的17%粗蛋白高粱-豆粕日粮可产生与饲喂21%粗蛋白日粮的仔猪相当的生长性能。
