Department of Animal Sciences, Faculty of Agriculture, University of Zabol, Zabol, Iran; Department of Special Domestic Animals, Research Institute of Zabol, Zabol, Iran 98661-5538.
Department of Animal Sciences, Faculty of Agriculture, University of Zabol, Zabol, Iran; Department of Special Domestic Animals, Research Institute of Zabol, Zabol, Iran 98661-5538.
Poult Sci. 2022 Oct;101(10):102096. doi: 10.1016/j.psj.2022.102096. Epub 2022 Aug 2.
A series of experiments was designed and conducted to determine the apparent and standardized ileal phosphorus digestibility (i.e., AIDP and SIDP, respectively) of some grains and protein meals in Japanese quail at different age classes during the growing period from the hatch to 35 d of age. Experimental diets included a PFD, to measure basal endogenous P losses (EPL), corn, wheat, soybean meal (SBM), and corn gluten meal (CGM), so as to be each ingredient the sole source of P, were developed and fed to five experimental groups with 5 replicates of 30 chicks each. Titanium dioxide as an indigestible marker was added to the diets at the rate of 5 g/kg of diet. The EPL in birds fed on PFD was estimated at 201 mg/kg dry matter intake (DMI) and quail chicks fed on PFD exhibited the lowest performance compared to chicks received dietary P regardless of P sources (P = 0.001). The estimated coefficients of AIPD (P = 0.001) | SIDP (P = 0.004) for CGM, corn, SBM, and wheat were 49.2 | 51.9%, 38.8 | 44.9%, 41.4 | 45.9%, and 33.2 | 40.1%, respectively. The mean differences between AIPD and SIPD coefficients with each ingredients including CGM (P = 0.245), corn (P = 0.169), and SBM (P = 0.169) were not statistically significant, while the comparison of those estimations for wheat (P = 0.022) showed significant differences. The present work showed that the use of direct method could successfully estimate the coefficients of P digestibility in growing quail for both the cereals and protein meals that were studied. The high relative contribution of endogenous P in young quail fed on wheat during the first 2 wk posthatch makes it inevitable to correct AIDP for EPL and evoke the implementation of SIDP coefficients in the feed formulation matrix.
设计并进行了一系列实验，以确定生长期间不同年龄阶段日本鹌鹑的表观和标准化回肠磷消化率（即 AIDP 和 SIDP）。实验日粮包括一个磷基础日粮（PFD），以测量基础内源磷损失（EPL），玉米、小麦、豆粕（SBM）和玉米蛋白粉（CGM），以便每种成分都是磷的唯一来源，共开发了 5 个实验组，每个实验组有 5 个重复，每个重复有 30 只小鸡。日粮中以 5 g/kg 日粮的比例添加二氧化钛作为不消化标记物。在 PFD 上喂养的鸟类的 EPL 估计为 201 mg/kg 干物质采食量（DMI），与接受日粮磷的雏鸡相比，无论磷源如何（P = 0.001），PFD 上喂养的雏鸡表现出最低的性能。CGM、玉米、SBM 和小麦的 AIPD 估计系数（P = 0.001）| SIDP（P = 0.004）分别为 49.2 | 51.9%、38.8 | 44.9%、41.4 | 45.9%和 33.2 | 40.1%。包括 CGM（P = 0.245）、玉米（P = 0.169）和 SBM（P = 0.169）在内的每种成分的 AIPD 和 SIDP 系数之间的平均差异没有统计学意义，而对小麦的这些估计值的比较（P = 0.022）显示出显著差异。本研究表明，在生长鹌鹑中，直接法可以成功地估计研究的谷物和蛋白质饲料的磷消化率系数。在孵化后前 2 周内，幼龄鹌鹑对小麦中内源磷的高相对贡献使得必须对 AIDP 进行 EPL 校正，并在饲料配方矩阵中引入 SIDP 系数。
