25-120kg豬飼喂低蛋白日糧情況下推薦的標準回腸可消化纈氨酸:賴氨酸

　　X. T. Liu, W. F. Ma, X. F. Zeng, C. Y. Xie, P. A. Thacker, J. K. Htoo和S. Y. Qiao

　　最大日增重時推薦添加量為0.62（折線模型）和0.71（二次線性模型）。試驗二（49-70kg），日增重隨著日糧可消化纈氨酸:賴氨酸的增加而提高（線性，P=0.021;二次線性，P=0.042），而血漿尿素氮含量隨之降低（線性，P=0.021;二次線性，P=0.024）。日增重最好和血漿尿素氮最低時推薦比例分別為0.67和0.65（折線模型），使用二次線性模型時，推薦比例則分別為0.72和0.74。試驗三（71-92kg），隨著日糧可消化纈氨酸:賴氨酸的增加，日增重隨之增加（線性，P=0.007;二次線性，P=0.022），血漿尿素氮隨之降低（線性，P=0.011;二次線性，P=0.034）。日增重最好和血漿尿素氮最低時推薦比例分別為0.67和0.67（折線模型），使用二次線性模型時，推薦比例則分別為0.72和0.74。

　　試驗四（94-119kg），隨著日糧可消化纈氨酸:賴氨酸的增加，日增重隨之增加（線性，P=0.041;二次線性，P=0.004），飼料轉化率隨之降低（線性，P=0.004;二次線性，P=0.005）。飼料轉換率最佳時推薦比例為0.68（折線模型）或0.72（二次線性模型），血漿尿素氮最低時推薦比例。可消化纈氨酸:賴氨酸比例不影響胴體品質和肌肉質量。總之，26-46kg、49-70kg、71-92kg、94-119kg階段日糧可消化纈氨酸:賴氨酸的推薦比例分別為0.62、0.66、0.67、0.68（折線模型）或0.71、0.72、0.73、0.72（二次線性模型）。

　　Estimation of the standardized ileal digestible valine to lysine ratio required for 25- to 120-kilogram pigs fed low crude protein diets supplemented with crystalline amino acids

　　X. T. Liu, W. F. Ma, X. F. Zeng, C. Y. Xie, P. A. Thacker, J. K. Htoo and S. Y. Qiao

　　Four 28-d experiments were conducted to determine the standardized ileal digestible (SID) valine (Val) to lysine (Lys) ratio required for 26- to 46- (Exp. 1), 49- to 70- (Exp. 2), 71- to 92- (Exp. 3), and 94- to 119-kg (Exp. 4) pigs fed low CP diets supplemented with crystalline AA. The first 3 experiments utilized 150 pigs (Duroc × Landrace × Large White), while Exp. 4 utilized 90 finishing pigs. Pigs in all 4 experiments were randomly allocated to 1 of 5 diets with 6 pens per treatment (3 pens of barrows and 3 pens of gilts) and 5 pigs per pen for the first 3 experiments and 3 pigs per pen for Exp. 4. Diets for all experiments were formulated to contain SID Val to Lys ratios of 0.55, 0.60, 0.65, 0.70, or 0.75. In Exp. 1 (26 to 46 kg), ADG increased (linear, P = 0.039; quadratic, P = 0.042) with an increasing dietary Val:Lys ratio. The SID Val:Lys ratio to maximize ADG was 0.62 using a linear broken-line model and 0.71 using a quadratic model. In Exp. 2 (49 to 70 kg), ADG increased (linear, P = 0.021; quadratic, P = 0.042) as the SID Val:Lys ratio increased. G:F improved (linear, P = 0.039) and serum urea nitrogen (SUN) decreased (linear, P = 0.021; quadratic, P = 0.024) with an increased SID Val:Lys ratio. The SID Val:Lys ratios to maximize ADG as well as to minimize SUN levels were 0.67 and 0.65, respectively, using a linear broken-line model and 0.72 and 0.71, respectively, using a quadratic model. In Exp. 3 (71 to 92 kg), ADG increased (linear, P = 0.007; quadratic, P = 0.022) and SUN decreased (linear, P = 0.011; quadratic, P = 0.034) as the dietary SID Val:Lys ratio increased. The SID Val:Lys ratios to maximize ADG as well as to minimize SUN levels were 0.67 and 0.67, respectively, using a linear broken-line model and 0.72 and 0.74, respectively, using a quadratic model. In Exp. 4 (94 to 119 kg), ADG increased (linear, P = 0.041) and G:F was improved (linear, P = 0.004; quadratic, P = 0.005) as the dietary SID Val:Lys ratio increased. The SID Val:Lys ratio to maximize G:F was 0.68 using a linear broken-line model and 0.72 using a quadratic model. Carcass traits and muscle quality were not influenced by SID Val:Lys ratio. In conclusion, the dietary SID Val:Lys ratios required for 26- to 46-, 49- to 70-, 71- to 92-, and 94- to 119-kg pigs were estimated to be 0.62, 0.66, 0.67, and 0.68, respectively, using a linear broken-line model and 0.71, 0.72, 0.73, and 0.72, respectively, using a quadratic model。
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