Brudevold A B, Southern L L
Department of Animal Science, Louisiana State University Agricultural Center, Baton Rouge 70803.
J Anim Sci. 1994 Mar;72(3):638-47. doi: 10.2527/1994.723638x.
Five randomized block design experiments were conducted to determine the limiting amino acids (or other nutrients) in low-CP (12%) sorghum-soybean meal (S-SBM) diets for the 10- to 20-kg pig. Average initial weights were 10.7, 10.5, 9.1, 10.2, and 10.9 kg in Exp. 1, 2, 3, 4, and 5, respectively. The nine treatments in Exp. 1 were 1) Basal (B, 12% CP), 2) B + .26% methionine (Met), 3) B + .24% histidine (His), 4) B + .21% isoleucine (Ile), 5) B + .12% tryptophan (Trp), 6) B + .24% valine (Val), 7) B+Met+His, 8) B+Met+His+Ile+Trp+Val (AllAA), and 9) S-SBM positive control (PC, 21.81% CP). All diets provided 1.10% Lys and .83% Thr. Individual addition of His and Val to the B diet increased (P < .10) gain. The gain of pigs fed the AllAA diet did not differ (P > .10) from that of pigs fed the PC diet. Experiment 2 consisted of the nine treatments used in Exp. 1, except that Treatment 7 in Exp. 2 contained His+Val (H+V) rather than Met+His. Individual additions of Ile, Trp, and H+V increased (P < .10) gain/feed compared with the B diet. Performance of pigs fed the AllAA diet was not different (P > .10) from that of pigs fed the PC diet. Addition of NaHCO3 (Exp. 3), Phe (Exp. 4), or nonessential N (Exp. 5) to the AllAA diet did not affect (P > .10) pig performance compared with pigs fed the AllAA diet. However, in Exp. 3, pigs fed the PC diet grew faster (P < .03) and had greater (P < .10) apparent N digestibilities than pigs fed the AllAA diet. In summary, low-CP, S-SBM diets may be equally third limiting in His, Ile, Trp, and Val for the 10- to 20-kg pig.
进行了五项随机区组设计实验，以确定10至20千克猪的低粗蛋白（12%）高粱-豆粕（S-SBM）日粮中的限制性氨基酸（或其他营养素）。实验1、2、3、4和5中猪的平均初始体重分别为10.7、10.5、9.1、10.2和10.9千克。实验1中的九个处理组分别为：1）基础日粮（B，12%粗蛋白）；2）基础日粮+B+0.26%蛋氨酸（Met）；3）基础日粮+B+0.24%组氨酸（His）；4）基础日粮+B+0.21%异亮氨酸（Ile）；5）基础日粮+B+0.12%色氨酸（Trp）；6）基础日粮+B+0.24%缬氨酸（Val）；7）基础日粮+B+蛋氨酸+组氨酸；8）基础日粮+B+蛋氨酸+组氨酸+异亮氨酸+色氨酸+缬氨酸（全氨基酸组，AllAA）；9）S-SBM阳性对照（PC，21.81%粗蛋白）。所有日粮的赖氨酸含量均为1.10%，苏氨酸含量均为0.83%。在基础日粮中单独添加组氨酸和缬氨酸可提高（P<0.10）生长性能。饲喂全氨基酸组日粮的猪的生长性能与饲喂阳性对照日粮的猪相比无差异（P>0.10）。实验2采用了实验1中的九个处理组，不同的是实验2中的处理7包含组氨酸+缬氨酸（H+V）而非蛋氨酸+组氨酸。与基础日粮相比，单独添加异亮氨酸、色氨酸和组氨酸+缬氨酸可提高（P<0.10）生长性能/饲料转化率。饲喂全氨基酸组日粮的猪的生长性能与饲喂阳性对照日粮的猪相比无差异（P>0.10）。与饲喂全氨基酸组日粮的猪相比，在全氨基酸组日粮中添加碳酸氢钠（实验3）、苯丙氨酸（实验4）或非必需氮（实验5）对猪的生长性能无影响（P>0.10）。然而，在实验3中，饲喂阳性对照日粮的猪生长速度更快（P<0.03），表观氮消化率更高（P<0.10）。综上所述，对于10至20千克的猪，低粗蛋白的高粱-豆粕日粮中组氨酸、异亮氨酸、色氨酸和缬氨酸可能同样是第三限制性氨基酸。
