Effect of Cod-Liver Oil on Calcium Metabolism of Young Chicks

Abstract

The poultry industry contributes materially to the agricultural income of this country and constitutes a valuable home market for a large amount of wheat, corn, other grains, and by-products of the packing-house, dairy, and fishing industries. The increased per capita consumption of poultry and eggs, coupled with the perfection of artificial incubation and brooding equipment, has revolutionized the poultry industry, placing poultry raising on a mass-production basis. Formerly chickens were raised during the summer months, when an abundance

The Basic Calcium Phosphates and Related Systems. Some Theoretical and Practical Aspects.

“…29 Hendricks and coworkers (74) heated mixtures of calcium carbonate and "hydrated tricalcium phosphate" or "pure" hydroxyapatite to con-27 Many years before x-rays were known or applied in this field, the composition of bony substances and their chemical behavior led to the assumption that an apatite was present (1,85,225). Numerous analyses show an approximately constant mole ratio of Ca:P = 10:6 for many kinds of bone under a wide variety of conditions (20,22,28,29,63,64,80,81,87,107,122,137,152,195,200,204,205,209,225). stant weight at 900°C.…”

Cereals and Rickets

“…Tully et al (1931), using oyster shells or limestone meal with steamed bone meal, found that a Ca/P ratio of 3.3:1 gave the best results. Holmes and Pigott (1931) observed that the best growth and Ca utilization was obtained on diets supplemented with cod liver oil, containing from 1 percent to 4 percent Ca., and having a maximum Ca/P ratio of 1.5:1. Widening the Ca/P ratio resulted in poor growth and bone development.…”

A Study of Leg-bone Deformities in Growing Chicks

“…With a minimum supply of vitamin D the ratio is more limited than with an adequate one. Holmes and Pigott (1931) obtained the best growth with a ration having a maximum calcium-phosphorus ratio of 1.5:1.0.…”