| Popis: |
THE work of several investigators has indicated that the optimum ratio of calcium to phosphorus in the diet of the growing chick is between 2:1 and 4:1. Bethke, Kennard, Kick, and Zinzalian (1929) concluded that the optimum ratio lies between 3:1 and 4:1 and that the minimum amount of the antirachitic factor is required when the diet has this ratio. Hart, Scott, Kline, and Halpin (1930) found the optimum ratio to be between 2:1 and 4:1, and thus they roughly confirmed the findings of Bethke and associates; also, they concluded that when a minimum of vitamin D is supplied, the range is narrowed to between 3.3:1 and 3.8:1. Since most of the ordinary feedstuffs contain more phosphorus than calcium, it is necessary to add a salt of calcium, other than tricalcium phosphate, if a ratio as large as even 2.0:1 is to be realized. Some form of calcium carbonate is . . . |
