Estimation of the standardized ileal digestible lysine requirement and optimal sulphur amino acids to lysine ratio for 30-50 kg pigs.

摘要: Two experiments were conducted to determine the standardized ileal digestible (SID) lysine (Lys) requirement and ideal SID sulphur amino acids (SAA) Lys ratio for 30-50 kg crossbred pigs. In experiment 1, a total of 72 pigs with an average initial body weight (BW) 28.9 kg allotted one six dietary treatments in randomized complete block design. Each diet was assigned pens containing two each. Six diets obtained by supplementing graded levels L-Lysine∙HCl create (0.70%, 0.80%, 0.90%, 1.00%, 1.10% 1.20%). Responses gain (ADG) gain:feed (G:F) increasing content fitted well curvilinear-plateau model; whereas, plasma urea nitrogen (PUN) two-slope linear broken-line model fitted. The optimal this period 1.10%. Experiment 2 dose-response study using Met+Cys ratios 50%, 55%, 60%, 65%, 70% 64%. A BW 32.9 kg randomly receive diets. Diets 1-5 formulated contain 1.0% be second limiting 6 contained 1.11% adequate Lys. SAA:Lys maximal ADG G:F minimal PUN 65.2% models.