The Calcium-Phosphorus Relationship in the Nutrition of the Growing Chick

Perosis, or Deforming Leg Weakness, in the Chicken

“…Experiment 6.-The next experiment was conducted along similar lines for the purpose of studying the effect of adding various amounts of rice bran to the original diet after its calcium-phosphorus ratio had been changed from 1.54:1 to 3.24:1 by substituting calcium carbonate for the bone meal. * The results indicated that 6 * Recent experimental work [Bethke, Kennard, Kick, and Zinzalian (1929) and Hart, Scott, Kline, and Halpin (1930)] has indicated that the optimum calcium-phosphorus ratio of the chick is between 2:1 and 4:1. Wilgus (1931), claims that it is between 1:1 and 2:2:1 and that "A ratio of 2 :S :1 is borderline while 3:3:1 is disastrous."…”

Blood Analyses of Normal Bronze Turkeys

“…son and Carr (1923), Steenbock, Hart, Jones, and Black (1923), Hart, Halpin, and Steenbock (1922), Hughes and Titus (1926), Thompson and Powers (1925), Ackerson, Bliss, and Mussehl (1925), Bethke, Kennard, Kick, and Zinzalian (1929), Massengale (1929), Hogan, Shrewsbury, and Kempster (1929) To this end, 10 Bronze pullets and 5 young Bronze toms were selected for individual blood analysis from the station's range flock of breeders. The specimens selected were approximately seven months of age and had been kept under uniform conditions.…”

Factors Involved in Malformation of the Bones of Growing Chickens

“…) as follows: "calcification of rachitic cartilage took place within nine hours-in an aqueous solution containing, in 100 cc, calcium 10 mg., inorganic phosphorus, 4 mg. at a pH between 7.05 and 7.4." Bethke, Kennard, Kick, and Zinzalian (1929) suggest the optimum or near optimum ratio of calcium to phosphorus in the ration for growing chicks lies between 3:1 and 4:1. Hart, Scott, Kline and Halpin (1930) suggest the optimum ratio of calcium to phosphorus for the ration of growing chicks should be 1:.5 or 1:.2S.…”