title: Low-protein, crystalline amino acid-supplemented, sorghum-soybean meal diets for the 10- to 20-kilogram pig.
abstract: 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.
authors.affiliation: Department of Animal Science, Louisiana State University Agricultural Center, Baton Rouge 70803.
authors.forename: A B
authors.initials: AB
authors.lastname: Brudevold
authors.forename: L L
authors.initials: LL
authors.lastname: Southern
mesh_terms: D000596:Amino Acids / Q000008:administration & dosage*; D000821:Animal Feed; D000818:Animals; D001806:Blood Urea Nitrogen; D004044:Dietary Proteins / Q000008:administration & dosage*; D004435:Eating; D002523:Edible Grain; D005260:Female; D006400:Hematocrit / Q000662:veterinary; D008297:Male; D009929:Organ Size; D011897:Random Allocation; D013025:Glycine max; D013552:Swine / Q000097:blood / Q000254:growth & development*; D015430:Weight Gain
chemical_list: D000596:Amino Acids; D004044:Dietary Proteins