Simeonov S, Vrigazov A
Vet Med Nauki. 1981;18(7):61-7.
Experiments were carried out with 6 pigs to study the assimilation of phosphorus of monosodium (NaH2PO4) and dicalcium (CaHPO4) 32P-labelled phosphate. A group of 3 pigs was given monosodium phosphate, and another goup of 3 pigs--dicalcium phosphate. Each pig was given 32P orally, once, at the rate of 20 microCi per kg body weight. A pig of each group was killed on the 3rd, 6th, and 9th day following the administration of 32P. It was found that 32P of NaH2PO4 and CaHPO4 was eliminated mainly with the feces and mostly during the first 48-72 hours after treatment. The total amount of 32P retained in the body of those of the animals that were given CaHPO4 was comparatively higher (89.45-66.80 per cent) than that n the pigs given NaH2PO4 (87.31-52.56 per cent). The percent of 32P retained in the femoral bones and the investigated organs proved higher in the animals that were given monosodium phosphate (10.37-3.08; 24.63-7.15) than in those that were treated with dicalcium phosphate (8.88-3.63; 20.37-5.91). The higher percent of 32P retention in the pigs treated with monosodium phosphate concerned chiefly the gastrointestinal tract. Highest percent of retention in the investigated organs in both groups of animals was established in the small intestine (9.24-4.35 and 6.70-2.90), the liver (6.55-3.33 and 6.00-2.22), and the large intestine (4.50-1.25 and 2.06-0.70). The level of radioactivity of the blood was highest in the first 24 hours. It is concluded that P of monosodium and dicalcium phosphate is almost equally retained and assimilated in the body of pigs.
用6头猪进行实验，研究单钠（磷酸二氢钠）和二钙（磷酸氢钙）32P标记磷酸盐中磷的同化情况。一组3头猪给予磷酸二氢钠，另一组3头猪给予磷酸氢钙。每头猪按每千克体重20微居里的剂量口服一次32P。在给予32P后的第3天、第6天和第9天，每组宰杀一头猪。结果发现，磷酸二氢钠和磷酸氢钙中的32P主要随粪便排出，且大多在治疗后的头48 - 72小时内。给予磷酸氢钙的动物体内保留的32P总量（89.45 - 66.80%）比给予磷酸二氢钠的猪（87.31 - 52.56%）相对更高。给予磷酸二氢钠的动物股骨和被研究器官中保留的32P百分比（10.37 - 3.08；24.63 - 7.15）高于给予磷酸氢钙的动物（8.88 - 3.63；20.37 - 5.91）。给予磷酸二氢钠的猪中32P保留百分比更高主要与胃肠道有关。两组动物被研究器官中保留百分比最高的是小肠（9.24 - 4.35和6.70 - 2.90）、肝脏（6.55 - 3.33和6.00 - 2.22）和大肠（4.50 - 1.25和2.06 - 0.70）。血液放射性水平在最初24小时内最高。结论是，磷酸二氢钠和磷酸氢钙中的磷在猪体内的保留和同化情况几乎相同。
