Abstract
It is said that in grain there is a certain action that interferes with the bone calcification of young animals which is thought to be phytic-acid.However, there has been no report made on the effects of phytic-acid of rice on the calcification of tooth.
In view of this, experiments were performed to see how phytic-acid in rice effected the histological changes in the calcification of rat tooth and the interference with Ca-absorption by the mucous membrane of rat intestine, with special references to the effects of the ratio of Ca/P on the calcification of tooth and the condition of Ca-absorption.
1) When polished or unpolished rice was used as basic feed, it was found that the calcification of rat tooth was better in the case of the former than the latter.
2) When sodium-phosphate or sodium-phytate which was extracted from rice-bran was used as an additive for the feed, the interference with the calcification of tooth was found to be more severe in the latter case. 3) When fed on low Ca and high P feed, the degree of interference with the tooth calcification and Ca-absorption by phytic-acid was severe, but in each case the addition of Ca or V.D of proper consistency to the feed, greatly improved this situation.
