8-12kg豬標(biāo)準(zhǔn)回腸可消化（SID）亮氨酸和賴氨酸的推薦比例

畜牧編輯

　　2015. J. Anim. Sci. 93: 2218-2224

　　8-12kg豬標(biāo)準(zhǔn)回腸可消化（SID）亮氨酸和賴氨酸的推薦比例

　　E. A. Soumeh, J. van Milgen, N. M. Sloth, E. Corrent, H. D. Poulsen 和J. V. Nørgaard

　　本試驗?zāi)康脑谟谘芯吭跀嗄套胸i飼喂低蛋白日糧時亮氨酸的需要量。通過設(shè)計不同亮氨酸含量的日糧，預(yù)測斷奶仔豬最佳生長性能時標(biāo)準(zhǔn)可消化亮氨酸和賴氨酸的比例。本試驗選取96頭雌豬（初始重8kg），分為6組，每組16頭，每頭豬單欄飼養(yǎng)。日糧中添加不同水平的L-亮氨酸，使日糧標(biāo)準(zhǔn)回腸可消化亮氨酸和賴氨酸比例依次為0.7、0.8、0.9、1.0、1.1、 1.2。日糧賴氨酸水平為推薦量的90%。試驗期兩周，記錄日均采食量、日增重和增重耗料比。試驗期間每周結(jié)束時采取血樣和尿樣。當(dāng)SID亮氨酸/賴氨酸從0.7提高到0.8時日均采食量線性增加（P＜0.001），隨后保持穩(wěn)定。日增重隨SID亮氨酸/賴氨酸的提高（從0.7至0.9）呈二次線性關(guān)系（P=0.02），在0.9繼續(xù)提高至1.2時日增重沒有變化。增重耗料比隨SID亮氨酸/賴氨酸的提高呈二次線性關(guān)系（P＜0.001），SID亮氨酸/賴氨酸在0.8時，增重耗料比最佳。隨著SID亮氨酸/賴氨酸的提高，血漿亮氨酸含量也線性增加（P＜0.001），并且其與血漿胱氨酸含量呈二次線性關(guān)系。其它大多數(shù)氨基酸在日糧SID亮氨酸/賴氨酸在0.9至1.0時血漿中的含量最低。血漿尿素氮在SID亮氨酸/賴氨酸在1.0時最低（P=0.08），表明在此狀況下日糧氨基酸更加平衡。曲線-折線模型結(jié)果表明，8-12kg雌豬在日糧SID亮氨酸/賴氨酸在0.93時生長性能最佳。

　　The optimum ratio of standardized ileal digestible leucine to lysine for 8 to 12 kg female pigs

　　E. A. Soumeh, J. van Milgen, N. M. Sloth, E. Corrent, H. D. Poulsen and J. V. Nørgaard

　　The objective of the study was to estimate Leu requirement for weaned piglets to balance indispensable AA in reduced CP diets. A dose-response experiment was conducted to estimate the standardized ileal digestible (SID) Leu to Lys ratio required for the maximum growth of young pigs after weaning. In this study, 96 female pigs (initial BW of 8 kg) were allotted to 1 of 6 dietary treatments with 16 individually penned pigs per treatment. Graded levels of crystalline l-Leu were added to a basal diet to provide diets containing 0.70, 0.80, 0.90, 1.00, 1.10, and 1.20 SID Leu:Lys. Lysine was limiting and fulfilled 90% of the current recommendations. The ADFI, ADG, and G:F were determined during a 2 wk experimental period. Blood and urine samples were taken at the end of each wk. The ADFI increased linearly (P < 0.001) from 0.70 to 0.80 SID Leu:Lys and then remained constant from 0.90 to 1.20 SID Leu:Lys. The ADG showed a quadratic increase (P = 0.02), as the SID Leu:Lys level increased from 0.70 to 0.90 SID Leu:Lys and did not change further from 0.90 to 1.20 SID Leu:Lys. The G:F increased quadratically (P < 0.001) with increasing SID Leu:Lys level, and the greatest G:F was achieved with pigs receiving the diet with 0.80 SID Leu:Lys. Increasing the dietary SID Leu:Lys resulted in a linear increase in plasma Leu concentration (P < 0.001) and quadratic increases (P < 0.001) in plasma Cys concentration. The plasma concentration of most of the other AA was lowest in pigs receiving the diets with 0.90 to 1.00 SID Leu:Lys. The plasma urea nitrogen concentration tended (P = 0.08) to be lowest in pigs receiving 1.00 SID Leu:Lys, suggesting a more balanced AA profile at this level. Using a curvilinear-plateau model, the SID Leu:Lys requirement was estimated at 0.93 to maximize growth in female pigs weighing 8 to 12 kg。
文章由上海亙泰企業(yè)提供。