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Using crystalline amino acids to supplement broiler chicken requirements in reduced protein diets.
Poultry Science ( IF 3.8 ) Pub Date : 2020-01-30 , DOI: 10.1016/j.psj.2019.12.005
M Hilliar 1 , G Hargreave 2 , C K Girish 3 , R Barekatain 4 , S-B Wu 1 , R A Swick 1
Affiliation  

Reducing dietary CP can reduce N pollution. Much research has been reported in corn-based diets; however, the amino acid (AA) profiles of wheat-based diets differ. Poor performance as a result of reduced protein (RP) has been overcome in corn-based diets with essential AA and glycine (Gly) supplementation. The current study examined RP levels and Gly in wheat-based diets. An industry standard protein (SP) diet plus 3 RP diets with and without Gly supplementation, to match the SP treatment at 0.713 and 0.648% digestible Gly for the grower and finisher periods respectively, were fed to male broilers from day 10 of age. Grower CP included 22.5, 20.6, 18.3, and 17.7% (days 10-21) and finisher CP included 19.7, 17.8, 16.2, and 15.5% (days 21-35). Performance, meat yield, N efficiency, water intake, and apparent ileal digestibility of N and AA were measured. No difference in body weight gain (BWG), feed intake, or feed conversion ratio (FCR) were observed at 20% CP compared to the SP treatment. However, further reducing protein reduced BWG (P < 0.001), feed intake (P < 0.001), and increased FCR (P < 0.001). Supplementation of 0.713% Gly in the grower period increased BWG (P < 0.001) and reduced FCR (P < 0.001). Relative meat yield was not affected by dietary protein, however reducing CP increased relative fat pad weight (P < 0.001). Nitrogen efficiency increased with decreased CP in both grower (R2 = 0.69) and finisher (R2 = 0.80) treatments. Water intake decreased (R2 = 0.83) with decreasing CP intake. Apparent ileal digestibility of AA and N were higher in RP diets (P < 0.05). The benefits of reduced water intake and increased N efficiency and the disadvantages of poor performance and increased body fat in RP corn-based diets have been identified in RP wheat-based diets. Furthermore, at 18.5% CP the supplementation of crystalline AA and Gly can maintain BWG and FCR observed in SP diets.

中文翻译:

使用减少蛋白质饮食中的结晶氨基酸来补充肉鸡的需求。

减少饮食中的CP可以减少氮污染。关于基于玉米的饮食,已有许多研究报道。但是,基于小麦的饮食的氨基酸(AA)谱有所不同。补充必需氨基酸和甘氨酸(Gly)的玉米饮食克服了因蛋白质(RP)降低而导致的性能下降。当前的研究检查了小麦饮食中的RP水平和Gly。从生长的第10天开始,将工业标准蛋白质(SP)饮食加上3种RP饮食(添加和不添加Gly)相匹配,以分别在成长期和育肥期分别以0.713和0.648%的可消化Gly进行SP处理,以饲喂雄性肉鸡。种植者CP包括22.5、20.6、18.3和17.7%(第10-21天),而整理器CP包括19.7、17.8、16.2和15.5%(第21-35天)。性能,肉产量,氮效率,摄水量,测定了氮和氨基酸的回肠消化率。与SP处理相比,在20%CP下未观察到体重增加(BWG),采食量或饲料转化率(FCR)的差异。但是,进一步降低蛋白质可降低BWG(P <0.001),采食量(P <0.001)和FCR(P <0.001)。在生育期补充0.713%的Gly可增加BWG(P <0.001)和降低FCR(P <0.001)。相对蛋白产量不受日粮蛋白质的影响,但是降低CP会增加相对脂肪垫的重量(P <0.001)。在种植者(R2 = 0.69)和育肥者(R2 = 0.80)的处理中,氮效率随CP降低而增加。随着CP摄入量的减少,水的摄入量减少(R2 = 0.83)。RP日粮中AA和N的表观回肠消化率较高(P <0.05)。在RP小麦基日粮中已发现减少水分摄入和提高N效率的好处,以及RP玉米基日粮中性能差和体脂肪增加的缺点。此外,在18.5%的CP下,补充晶体AA和Gly可以维持SP日粮中观察到的BWG和FCR。
更新日期:2020-01-30
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