生长猪饲喂低蛋白日粮的理想回肠苏氨酸:赖氨酸之比

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　　发布日期 ：2013年6月18日
　　作者:G J Zhang, C Y Xie, P A Thacker, J K Htoo, S Y Qiao (2013).
　　论文题目: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.
　　来源期刊:Animal Feed Science and Technology, 180; 83-91.
　　链接:http://dx.doi.org/10.1016/j.anifeedsci.2013.01.006
　　降低饲料成本和氮排泄可通过将日粮中的部分蛋白质(CP)用结晶氨基酸(CAA)取代来实现。猪采食低蛋白日粮（蛋白水平减少30-40g/kg），并添加CAA，可以达到和常规蛋白水平一样的饲养效果，同时还能减少蛋白原料的利用以及饲料成本。本研究的目的是为了测定不同标准回肠(SID)苏氨酸(Thr)与赖氨酸(Lys)之比对饲喂低蛋白日粮生长猪的性能和血清特征的影响。
　　在试验1中，144头生长猪(22-50kg)随机分配到3个日粮组中。处理组包括高蛋白日粮(186g/kg)，SID赖氨酸为10.2 g/kg，两个低蛋白日粮组（日粮蛋白减少幅度40g/kg，但添加结晶赖氨酸，苏氨酸，蛋氨酸，色氨酸，异亮氨酸和缬氨酸）且SID赖氨酸分别为9或10.2 g/kg。每组6个猪圈，每个猪圈8头猪。
　　采食低蛋白日粮且SID赖氨酸为9 g/kg的猪日增重(ADG)低于(P<0.05) SID赖氨酸为10.2 g/kg 的猪（不论它们采食高蛋白还是低蛋白日粮），这证实这个日粮组的赖氨酸浓度是不充足的，因此试验2中采用这个SID赖氨酸水平。
　　在试验2中，300 头(22-50kg)生长猪被安排进剂量效应试验中。猪被随机安排进SID赖氨酸为9g/kg的5个试验组中。晶体苏氨酸的水平为(0.6, 1.0, 1.5, 1.9或 2.4g/kg)添加到日粮中保证SID Thr与 Lys之比为0.55, 0.60, 0.65, 0.70 或0.75。每个组有6个猪圈，10头猪。当日粮中SID Thr与 Lys之比增加时，血清中苏氨酸和甘氨酸上升了(线性, P<0.05)。血清尿氮（SUN；线性，二次方，P<0.05)以及赖氨酸，蛋氨酸和胱氨酸(线性, P<0.05)随着日粮SID Thr与 Lys之比增加而下降。有了这些有价值的数据，我们推断22-50kg的生长猪采食低蛋白日粮，添加CAA，且最佳SID Thr与 Lys之比为0.70时可最大化ADG,为 0.68可优化PCR，为0.63可最大程度地减小SUN。未来的研究应该测定最佳SID Thr与 Lys之比是否会被日粮蛋白水平影响。
　　译者：IRIS
　　英文来源：pig333.com
附注：会员xuetingfeng 发布的

猪用饲料标准回肠消化蛋白质及氨基酸（仅供参考），

链接：http://www.xumuren.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

这种研究成果的应用推广意义较大。

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bonderic 发表于 2013-10-31 11:13
这种研究成果的应用推广意义较大。

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