Abstract

An experiment was conducted to test the hypothesis that inclusion of hybrid rye in diets containing corn and soybean meal (SBM) without or with microbial phytase improves the apparent total tract digestibility (ATTD) and the standardized total tract digestibility (STTD) of P because of the intrinsic phytase activity in hybrid rye. Forty-eight growing barrows (initial body weight: 39.5 ± 7.7 kg) were allotted to six diets. A basal diet containing corn and SBM; a rye-based diet; and a diet containing corn, SBM, and rye were formulated. Each diet was formulated without and with microbial phytase (500 units/kg of diet) for a total of six diets. Fecal samples were collected for 4 d following a 5-d adaptation period according to the marker-to-marker procedure. Results indicated that no interactions between diets and concentration of phytase were observed for any of the response criteria measured. The ATTD and STTD of P and the ATTD of Ca differed (P < 0.05) among diets, but regardless of diet, the concentration of P in feces was reduced (P < 0.05) by adding microbial phytase to the diets. As a consequence, microbial phytase increased (P < 0.05) ATTD and STTD of P, and the ATTD of Ca was also increased (P < 0.05) by the use of microbial phytase. Measured values for the ATTD and STTD of P in the diets containing corn, SBM, and hybrid rye without or with phytase were greater (P < 0.05) than values that were predicted based on the ATTD and STTD of P for the corn–SBM and the hybrid rye diet. The observation that STTD predicted from the individual ingredients underestimated the STTD of P in the mixed diet indicates that the intrinsic phytase in hybrid rye resulted in increased digestibility of the P in the corn and SBM included in the corn–SBM–hybrid rye diet. In conclusion, microbial phytase increased the ATTD and STTD of P and the ATTD of Ca regardless of feed ingredients used in diets fed to pigs. In addition, the intrinsic phytase from hybrid rye increased the ATTD and STTD of P in corn and SBM.

中文翻译：

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杂交黑麦中的内在植酸酶提高了生长猪日粮中玉米和豆粕中磷的消化率。

 抽象的

进行了一项实验来检验这样的假设：在含有玉米和豆粕（ SBM ）的日粮中添加杂交黑麦（不含或含有微生物植酸酶）可改善磷的表观总消化道消化率（ ATTD ）和标准化总消化道消化率（ STTD ），因为杂交黑麦的内在植酸酶活性。 48 只生长中的阉猪（初始体重：39.5 ± 7.7 kg）被分配给 6 种饮食。含有玉米和豆粕的基础饮食；以黑麦为主的饮食；并制定了含有玉米、豆粕和黑麦的饮食。每种饮食均配制为不含和含微生物植酸酶（500 单位/千克饮食），总共六种饮食。根据标记到标记程序，在 5 天的适应期后收集粪便样本 4 天。结果表明，对于任何测量的响应标准，都没有观察到饮食和植酸酶浓度之间的相互作用。日粮中 P 的 ATTD 和 STTD 以及 Ca 的 ATTD 存在差异（ P < 0.05），但无论何种日粮，通过在日粮中添加微生物植酸酶，粪便中 P 的浓度均降低（ P < 0.05）。结果，微生物植酸酶增加了 P 的 ATTD 和 STTD（ P < 0.05），并且 Ca 的 ATTD 也通过使用微生物植酸酶而增加（ P < 0.05）。含有玉米、SBM 和杂交黑麦（不含或含有植酸酶）的日粮中 P 的 ATTD 和 STTD 测量值大于根据玉米-SBM 和混合黑麦的 ATTD 和 STTD 预测的值（ P < 0.05）。混合黑麦饮食。 根据单个成分预测的 STTD 低估了混合日粮中磷的 STTD，这一观察结果表明，杂交黑麦中的内在植酸酶导致玉米-SBM-杂交黑麦日粮中包含的玉米和 SBM 中磷的消化率增加。总之，无论猪日粮中使用何种饲料成分，微生物植酸酶都会增加磷的 ATTD 和 STTD 以及钙的 ATTD。此外，杂交黑麦的内在植酸酶增加了玉米和SBM中磷的ATTD和STTD。