生長豬飼喂低蛋白日糧的理想回腸蘇氨酸:賴氨酸之比

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　　發布日期 ：2013年6月18日
　　作者:G J Zhang, C Y Xie, P A Thacker, J K Htoo, S Y Qiao (2013).
　　論文題目:Estimation of the ideal ratio of standardized ileal digestible threonine to lysine for growing pigs (22-50kg) fed low crude protein diets supplemented with crystalline amino acids.
　　來源期刊:Animal Feed Science and Technology, 180; 83-91.
　　鏈接:http://dx.doi.org/10.1016/j.anifeedsci.2013.01.006
　　降低飼料成本和氮排泄可通過將日糧中的部分蛋白質(CP)用結晶氨基酸(CAA)取代來實現。豬采食低蛋白日糧（蛋白水平減少30-40g/kg），并添加CAA，可以達到和常規蛋白水平一樣的飼養效果，同時還能減少蛋白原料的利用以及飼料成本。本研究的目的是為了測定不同標準回腸(SID)蘇氨酸(Thr)與賴氨酸(Lys)之比對飼喂低蛋白日糧生長豬的性能和血清特征的影響。
　　在試驗1中，144頭生長豬(22-50kg)隨機分配到3個日糧組中。處理組包括高蛋白日糧(186g/kg)，SID賴氨酸為10.2 g/kg，兩個低蛋白日糧組（日糧蛋白減少幅度40g/kg，但添加結晶賴氨酸，蘇氨酸，蛋氨酸，色氨酸，異亮氨酸和纈氨酸）且SID賴氨酸分別為9或10.2 g/kg。每組6個豬圈，每個豬圈8頭豬。
　　采食低蛋白日糧且SID賴氨酸為9 g/kg的豬日增重(ADG)低于(P<0.05) SID賴氨酸為10.2 g/kg 的豬（不論它們采食高蛋白還是低蛋白日糧），這證實這個日糧組的賴氨酸濃度是不充足的，因此試驗2中采用這個SID賴氨酸水平。
　　在試驗2中，300 頭(22-50kg)生長豬被安排進劑量效應試驗中。豬被隨機安排進SID賴氨酸為9g/kg的5個試驗組中。晶體蘇氨酸的水平為(0.6, 1.0, 1.5, 1.9或 2.4g/kg)添加到日糧中保證SID Thr與 Lys之比為0.55, 0.60, 0.65, 0.70 或0.75。每個組有6個豬圈，10頭豬。當日糧中SID Thr與 Lys之比增加時，血清中蘇氨酸和甘氨酸上升了(線性, P<0.05)。血清尿氮（SUN；線性，二次方，P<0.05)以及賴氨酸，蛋氨酸和胱氨酸(線性, P<0.05)隨著日糧SID Thr與 Lys之比增加而下降。有了這些有價值的數據，我們推斷22-50kg的生長豬采食低蛋白日糧，添加CAA，且最佳SID Thr與 Lys之比為0.70時可最大化ADG,為 0.68可優化PCR，為0.63可最大程度地減小SUN。未來的研究應該測定最佳SID Thr與 Lys之比是否會被日糧蛋白水平影響。
　　譯者：IRIS
　　英文來源：pig333.com
附注：會員xuetingfeng 發布的

豬用飼料標準回腸消化蛋白質及氨基酸（僅供參考），

鏈接：http://www.cqnsfzw.com/thread-529856-1-1.html


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英文原文：Feed costs and nitrogen excretion may be reduced by replacing a portion of the dietary crude protein (CP) in swine diets with crystalline amino acids (CAA). Pigs fed low CP diets (CP level reduced by 30–40g/kg) supplemented with CAA have been shown to achieve the same performance as those fed normal CP levels, while the amount of protein ingredients used and feed costs were both reduced. The aim of this study was to investigate the effects of various standardized ileal digestible (SID) threonine (Thr) to lysine (Lys) ratios on the performance and serum parameters of growing pigs fed low CP diets supplemented with CAA.

In Exp. 1, 144 growing pigs (22–50kg) were randomly allotted to one of three dietary treatments. The treatments included a high CP (186g/kg) diet with 10.2 g/kg SID Lys or one of two low CP diets (dietary CP reduced by 40g/kg but supplemented with crystalline Lys, Thr, methionine, tryptophan, isoleucine and valine) providing 9 or 10.2 g/kg SID Lys. Six pens with eight pigs were fed each treatment. The average daily gain (ADG) of pigs receiving the low CP diet containing 9 g/kg SID Lys was lower (P<0.05) than that of pigs fed diets containing 10.2g/kg SID Lys with either a high or low CP level confirming that the dietary Lys concentration in this diet was deficient and therefore this SID Lys level was used in all diets fed in Exp. 2.

In Exp. 2, 300 growing pigs (22–50kg) were utilized in a dose–response study. Pigs were randomly allotted to one of five dietary treatments containing 9g/kg SID Lys. Graded levels of crystalline Thr (0.6, 1.0, 1.5, 1.9 or 2.4g/kg) were added to the basal diet to produce diets providing SID Thr to Lys ratios of 0.55, 0.60, 0.65, 0.70 or 0.75. Each diet was fed to six pens with ten pigs. Serum Thr and glycine were increased (linear, P<0.05) as the dietary SID Thr to Lys ratio increased. Serum urea nitrogen (SUN; linear and quadratic, P<0.05), Lys, methionine and cystine decreased (linear, P<0.05) as the dietary SID Thr to Lys ratio increased. Taking an average of these values, we conclude that the optimum SID Thr to Lys ratio for 22–50kg pigs fed low CP protein diets supplemented with CAA is 0.70 to maximize ADG, 0.68 to optimize FCR and 0.63 to minimize SUN. Further research should be conducted to determine whether or not the optimum SID Thr to Lys ratio is affected by dietary CP level.

bonderic

這種研究成果的應用推廣意義較大。

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bonderic 發表于 2013-10-31 11:13
這種研究成果的應用推廣意義較大。

呵呵 歡迎推廣