The current study examined the influence of source and concentration of dietary phosphorus (P) on the apparent ileal digestibility (AID) and apparent total tract digestibility (ATTD) of P in growing pigs. Eighteen cannulated barrows (25 ± 5 kg) were allotted to a triplicate 6 × 3 incomplete Latin square design with six diets and three periods. The diets comprised of soybean meal (SBM) or distillers' dried grain with solubles (DDGS) as sole sources of dietary P, and three concentrations of P (2.0, 2.5 or 3.0 g/kg) in a 2 × 3 factorial arrangement. The AID and ATTD of P were not different (p = 0.37) in all diets. Apparent digestibility of P was affected (p < 0.01) by source and concentration of P. There was no interaction between source and concentration of dietary P on the apparent digestibility of P. Determined by regression analysis, the true ileal digestibility of P was 58.3% or 57.6%, and true total tract digestibility of P was 56.0% or 62.6%, for SBM or DDGS, respectively. The regression-derived ileal endogenous P loss (EPL) was 0.61 or 0.13 g/kg DM intake, and total tract EPL was 0.53 or 0.35 g/kg DM intake, for SBM or DDGS, respectively. In conclusion, the study demonstrated that both the source and concentration of dietary P affect the digestibility of P in growing pigs.

中文翻译：

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生长猪磷的消化率受日粮磷来源和浓度以及收集地点的影响

目前的研究调查了日粮磷 (P) 的来源和浓度对生长猪 P 的表观回肠消化率 (AID) 和表观总消化道消化率 (ATTD) 的影响。十八头空心手推车（25 ± 5 公斤）被分配到一式三份的 6 × 3 不完全拉丁方设计中，有六种饮食和三个时期。日粮包括豆粕 (SBM) 或含可溶物( DDGS)的干酒糟作为日粮 P 的唯一来源，以及按 2 × 3 因子排列的三种 P 浓度（2.0、2.5 或 3.0 g/kg）。 在所有饮食中，P 的 AID 和 ATTD 没有差异（p = 0.37）。P 的表观消化率受到影响 ( p < 0.01) P 的来源和浓度。日粮 P 的来源和浓度之间对 P 的表观消化率没有交互作用。通过回归分析确定，P 的真实回肠消化率为 58.3% 或 57.6%，真实总消化率对于 SBM 或 DDGS，P 的消化率分别为 56.0% 或 62.6%。对于 SBM 或 DDGS，回归导出的回肠内源性 P 损失 (EPL) 分别为 0.61 或 0.13 g/kg DM 摄入量，总道 EPL 为 0.53 或 0.35 g/kg DM 摄入量。总之，该研究表明，日粮磷的来源和浓度都会影响生长猪对磷的消化率。