Phosphorus Availability from the Ash of Unidentified Factor Sources

Abstract

INTRODUCTIONDURING the past few years, a number of reports have been published on the existence of an unknown mineral factor required, in addition to calcium, phosphorus and vitamin D, for normal calcification. Morrison et al. (1956) showed that the ash of unidentified chick growth factor supplements (ash at 2 percent level equivalent to 6 percent distillers dried solubles, 3 percent fish solubles, 3 percent dried whey products, 3 percent forage juice and 3 percent penicillin mycelium meal) caused an increase in bone calcification of chicks. Scott (1957) presented data on the effect of the ash of four unidentified growth factors on calcification. This worker indicated the possibility of the use of the ash of unidentified growth factor supplements for increasing the utilization of phosphorus from certain phosphorus supplements. Edwards et al. (1958) on the other hand, showed no beneficial effect on the availability of phosphorus from a relatively unavailable …