Kwon Woong Bi, Kim Beob Gyun
Department of Animal Science and Technology, Konkuk University, Seoul, Korea.
Anim Sci J. 2017 Jun;88(6):918-924. doi: 10.1111/asj.12785. Epub 2017 Mar 20.
An experiment was conducted to determine the standardized total tract digestibility (STTD) of phosphorus (P) in five sources of inorganic phosphate fed to growing pigs, including dicalcium phosphate (DCP), monodicalcium phosphate (MDCP), monocalcium phosphate (MCP), tricalcium phosphate (TCP) and monosodium phosphate (MSP, reagent grade). Six barrows (42.4 ± 1.1 kg) individually housed in metabolism crates were allotted to a 6 × 6 Latin square design with six dietary treatments and six periods. Each experimental period consisted of a 4 day adaptation period and a 5 day collection period. The five experimental diets contained 0.24 to 0.34% of P from each inorganic phosphate as a sole source of P. A P-free diet was also prepared to estimate the basal endogenous loss of P. The STTD of P in MSP (94.9%) was not different from the STTD of P in MCP (93.0%), but was greater (P < 0.05) than that in DCP, MDCP and TCP (87.0, 86.5 and 71.3%, respectively). In conclusion, digestibility of P in reagent-grade MSP was greater than that in feed-grade inorganic phosphates such as DCP, MDCP and TCP, and digestibility of P in DCP and MDCP was greater than that in the TCP.
进行了一项实验，以测定饲喂生长猪的五种无机磷酸盐来源中磷（P）的标准化全肠道消化率（STTD），这五种无机磷酸盐包括磷酸二钙（DCP）、磷酸一钙（MDCP）、磷酸二氢钙（MCP）、磷酸三钙（TCP）和磷酸二氢钠（MSP，试剂级）。将六头单独饲养在代谢笼中的公猪（42.4±1.1千克）按照6×6拉丁方设计分配，有六种日粮处理和六个时期。每个实验期包括4天适应期和5天收集期。五种实验日粮分别含有来自每种无机磷酸盐的0.24%至0.34%的磷作为唯一的磷源。还制备了无磷日粮以估计磷的基础内源损失。MSP中磷的STTD（94.9%）与MCP中磷的STTD（93.0%）无差异，但高于DCP、MDCP和TCP中磷的STTD（分别为87.0%、86.5%和71.3%，P<0.05）。总之，试剂级MSP中磷的消化率高于饲料级无机磷酸盐如DCP、MDCP和TCP中磷的消化率，DCP和MDCP中磷的消化率高于TCP中磷的消化率。
