Abstract
THE phosphorus requirement of laying hens has not been adequately defined. Earlier work at this Station indicated that 0.5 percent of phosphorus in the ration was insufficient to maintain egg production and egg shell strength but that 0.75 percent was adequate for these purposes (Norris, Heuser, Wilgus and Ringrose, 1933). Miller and Bearse (1934) obtained greater egg production with a ration containing approximately 0.8 percent phosphorus than with one containing 0.6 percent of this element.Evans and Carver (1942) reported that 0.8 percent of phosphorus gave better results than 0.6 or 1.2 percent when the ration contained 2.5 percent calcium. However, they found little difference between 0.6 and 0.8 percent phosphorus in a ration containing only 1.5 percent calcium. Evans, Carver and Brant (1944) reported that 0.8 percent phosphorus gave more consistently satisfactory egg shell quality than 0.6 percent phosphorus.In the case of young chicks and poults, it has …
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