25-120kg猪饲喂低蛋白日粮情况下推荐的标准回肠可消化缬氨酸:赖氨酸

畜牧编辑

　　2015. J. Anim. Sci. 93(10):4761-4773

　　25-120kg猪饲喂低蛋白日粮情况下推荐的标准回肠可消化缬氨酸:赖氨酸

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

　　本论文进行4个为期28天的试验，测定26-46kg（试验一）、49-70kg（试验二）、71-92kg（试验三）、94-119kg（试验四）阶段猪只饲喂低蛋白日粮下合适的可消化缬氨酸:赖氨酸比例。试验一至三使用150头杜长大三元杂交猪，试验四选用90头育肥猪。四个试验中所有猪只随机分为5个处理组，每组6圈，阉公猪和母猪各三圈，前三个试验每圈5头，试验四每圈3头。四个试验中可消化缬氨酸:赖氨酸试验处理均为0.55、0.60、0.65、0.70、0.75。试验一（26-46kg），随着日粮可消化缬氨酸:赖氨酸的提高，日增重有显著增加（线性，P=0.039;二次线性，P=0.042）。最大日增重时推荐添加量为0.62（折线模型）和0.71（二次线性模型）。试验二（49-70kg），日增重随着日粮可消化缬氨酸:赖氨酸的增加而提高（线性，P=0.021;二次线性，P=0.042），而血浆尿素氮含量随之降低（线性，P=0.021;二次线性，P=0.024）。日增重最好和血浆尿素氮最低时推荐比例分别为0.67和0.65（折线模型），使用二次线性模型时，推荐比例则分别为0.72和0.74。试验三（71-92kg），随着日粮可消化缬氨酸:赖氨酸的增加，日增重随之增加（线性，P=0.007;二次线性，P=0.022），血浆尿素氮随之降低（线性，P=0.011;二次线性，P=0.034）。日增重最好和血浆尿素氮最低时推荐比例分别为0.67和0.67（折线模型），使用二次线性模型时，推荐比例则分别为0.72和0.74。试验四（94-119kg），随着日粮可消化缬氨酸:赖氨酸的增加，日增重随之增加（线性，P=0.041;二次线性，P=0.004），饲料转化率随之降低（线性，P=0.004;二次线性，P=0.005）。饲料转换率最佳时推荐比例为0.68（折线模型）或0.72（二次线性模型），血浆尿素氮最低时推荐比例。可消化缬氨酸:赖氨酸比例不影响胴体品质和肌肉质量。总之，26-46kg、49-70kg、71-92kg、94-119kg阶段日粮可消化缬氨酸:赖氨酸的推荐比例分别为0.62、0.66、0.67、0.68（折线模型）或0.71、0.72、0.73、0.72（二次线性模型）。

　　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。
本文由上海亘泰企业提供，感谢特此供稿！

山中的漫游者

低蛋白背景下，我推荐使用二次线性模型，也就是较高比例的缬氨酸用量

dingjq03

其实实际上的配方，这个比例都能满足2次模型