Estimation of true phosphorus digestibility and endogenous phosphorus loss in growing chicks fed conventional and low-phytate soybean meals
Estimation of true phosphorus digestibility and endogenous phosphorus loss in growing chicks fed conventional and low-phytate soybean meals
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DOI：
10.1093/ps/85.4.661
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发表时间：
2006-04-01
期刊：
影响因子：
4.4
通讯作者：
Adeola, O
中科院分区：
文献类型：
--
作者：
Dilger, RN;Adeola, O
本研究评估了总磷输出量与日粮磷摄入量的回归，以同时估计肉鸡内源性磷损失和真实磷利用率。豆粕 (SBM) 作为模型成分，对传统豆粕和低植酸豆粕品种进行了比较。选择这些饲料是为了尽量减少膳食植酸盐含量的营养差异。低植酸豆粕的植酸含量比传统豆粕低 57%。配制了四种等热量日粮，以包含每种豆粕的分级水平（总共 8 种日粮）；因此，日粮中还含有分级水平的日粮 P。三氧化二铬作为难以消化的标记物包含在日粮中，并且在孵化后 15 至 22 天期间向 288 只雄性肉鸡免费提供实验日粮。该实验采用随机完整区组设计，有 6 个区组，每组 8 个笼子（每个笼子 6 只鸟），并且各个饮食处理的初始体重相似。由于磷摄入量范围为 0.9 至 3.9 g/kg DM，传统 SBM 和低植酸 SBM 的盲肠前磷消化率明显增加（线性和二次方，P < 0.01）。无论 SBM 品种如何，总 P 输出（DM 摄入量 mg/kg）与分级 P 摄入量之间的线性关系不断增加（P < 0.01）。低植酸 SBM (76.9%) 的真实磷保留率 (P < 0.01) 高于传统 SBM (59.8%)。豆粕之间的内源 P 估计值没有差异 (P > 0.10)，并且观察到的总体估计值为 235 mg P/kg DM 摄入量。本研究得出的结论是：1) 回归方法可能适用于估计肉鸡内源性磷损失，2) 当肉鸡饲喂缺磷日粮时，常规豆粕和低植酸豆粕之间的磷利用率差异受到日粮植酸含量的影响。
This study evaluated regression of total P output against dietary P intake to simultaneously estimate endogenous P loss and true P utilization in broiler chicks. Soybean meal (SBM) served as the model ingredient, and a comparison was made between conventional and low-phytate SBM varieties. These feedstuffs were chosen to minimize nutritive differences to dietary phytate content. Low-phytate SBM contained 57% less phytate than conventional SBM. Four isocaloric diets were formulated to contain graded levels of each soybean meal (8 diets total); therefore, the diets also contained graded levels of dietary P. Chromium sesquioxide was included in diets as an indigestible marker, and free access to experimental diets was provided to 288 male broiler chicks from 15 to 22 d posthatch. The experiment was arranged as a randomized complete block design with 6 blocks of 8 cages (6 birds per cage) and similar initial BW across dietary treatments. As P intake ranged from 0.9 to 3.9 g/kg of DM, apparent prececal P digestibilities increased (linear and quadratic, P < 0.01) for conventional SBM and low-phytate SBM. Increasing linear relationships (P < 0.01) were observed for total P output (mg/kg of DM intake) with graded P intake, regardless of SBM variety. True P retention was greater (P < 0.01) for low-phytate SBM (76.9%,) than for conventional SBM (59.8%). Endogenous P estimates were not different between soybean meals (P > 0.10), and an overall estimate of 235 mg of P/kg of DM intake was observed. This study concluded 1) the regression approach may be applicable in the estimation of endogenous P loss in broiler chicks and 2) the difference in P utilization between conventional and low-phytate soybean meals is influenced by dietary phytate content when broiler chicks are fed P-deficient diets.