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Effect of increased heat processing and particle size on phosphorus bioavailability in corn distillers dried grains with solubles

机译：热处理和粒径增加对玉米蒸馏器含可溶性谷物干粮中磷生物利用度的影响

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摘要

Previous studies have reported that increased heat processing and feeding larger particle size ingredients may increase the bioavailability of phytate P in some feedstuffs. Therefore, one chick experiment was conducted to determine the effect of various increased heat processing treatments on bioavailability of P in corn distillers dried grains with solubles (DDGS), and 2 chick experiments were conducted to determine the effect of particle size on bioavailability of P in DDGS. In addition, one precision-fed cecectomized rooster assay was conducted to evaluate the effects of increased heating on amino acid digestibility. For the chick experiments, a P-deficient cornstarch-dextrose-soybean meal basal diet containing 0.10% nonphytate P was supplemented with 0.0, 0.05, or 0.10% P from KH(2)PO(4) or 1 of 2 levels of DDGS. Diets were fed from 8 to 22 d of age, and P bioavailability relative to the P in KH(2)PO(4) was estimated using the standard curve or slope-ratio methods with tibia ash as the response variable. Increased heating of DDGS by autoclaving at 124 kPa and 121 degrees C for 60 to 80 min or by heating in a drying oven at 121 degrees C for 60 min significantly increased relative P bioavailability in DDGS (from 70 to as high as 91%) in several treatments. Amino acid digestibility, however, was greatly reduced by increased heating in most cases, particularly for Lys. Relative bioavailability of P was not significantly affected by DDGS particle sizes ranging from 542 to 837 microm. Our results indicated that increased heating of DDGS increased bioavailability of P but decreased digestibility of amino acids, particularly Lys, and that bioavailability of P was not affected by particle size.
机译：先前的研究已经报道，增加热量的加工和饲喂较大粒径的成分可能会增加某些饲料中植酸磷的生物利用度。因此，进行了一个雏鸡实验，以确定各种增加的热处理工艺对玉米酒糟中可溶物（DDGS）谷物中磷的生物利用度的影响，并且进行了两次雏鸡实验，以确定粒径对玉米中P的生物利用度的影响。 DDGS。另外，进行了一种精确进食的切除阴茎的公鸡测定，以评估加热对氨基酸消化率的影响。对于雏鸡实验，向P不足的玉米淀粉-葡萄糖-大豆粉基础日粮中添加0.10％非植酸盐P，并补充KH（2）PO（4）中的0.0、0.05或0.10％P或DDGS中2种水平中的1种。饮食的饲喂年龄为8至22 d，相对于KH（2）PO（4）中P的P生物利用度是使用标准曲线或斜率比方法（以胫骨灰分作为响应变量）估算的。通过在124 kPa和121摄氏度下高压灭菌60至80分钟或在干燥箱中在121摄氏度下加热60分钟来增加DDGS的加热，可以显着提高DDGS中DDGS的相对P生物利用度（从70增至91％）。几种治疗方法。但是，在大多数情况下，尤其是对于Lys，增加加热会大大降低氨基酸的消化率。 P的相对生物利用度不受DDGS粒径从542到837微米的影响。我们的结果表明，DDGS的加热增加会增加P的生物利用度，但会降低氨基酸（尤其是Lys）的消化率，并且P的生物利用度不受粒径的影响。

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