| Popis: |
An investigation was conducted to determine whether low-protein (LP), lysine-supplemented, sorghum-soybean meal (S-SBM) diets are deficient in threonine (Thr) for pigs fed ad libitum. Treatments were replicated eight times with four or five pigs each. Average initial and final weights were 32.9 and 103.4 in experiment 1 and 30.1 and 100.6 kg in experiment 2. The crude protein contents of the basal grower and finisher diets were 13.7 and 15.0% respectively. Experiment 1 consisted of the following treatments: (1) S-SBM; (2) S-SBM+0.1% L-Thr; (3) LP, S-SBM+0.10% L-lysine (Lys); (4) LP, S-SBM+0.1% Lys+0.1% Thr. Gain: feed ratio was lower (P 0.01) in pigs fed diet 3 than in pigs fed diets 1, 2 and 4. Average backfat thickness was higher (P 0.10) by diet. Low-protein, Lys-supplemented S-SBM diets may be deficient in Thr for growing-finishing pigs. |
