The Relationship Between Blood Calcium and Blood Phosphorus and the Effect of Variations in the Calcium Content of the Ration on Ovulation and Blood Calcium Changes in the Laying Pullet

Abstract

11Published with the permission of the Director| of the Wisconsin Agricultural Experiment Station "to 4 days.

Effect of Dietary Calcium and Phosphorus Levels on Ultra-Filterable Calcium and Dialyzable Phosphorus in the Laying Hen

“…At 2400 h, total calcium level had increased to 24.7 mg/dL, which corresponds to the reports in the literature of the effect of parathyroid hormone for the resorption of bone and for active formation of egg shell (Mueller et al, 1973). These results are similar to those observed by Deobald et al (1938), Winget and Smith (1958), Hertelendy and Taylor (1961), and Parsons and Combs (1981) who reported cyclic fluctuation of blood calcium during the egg cycle.…”

“…Charles and Hogben (1933) reported that the presence of an egg in the oviduct was accompanied by a transitory rise in blood calcium. Deobald et al (1938) reported that only small variations in serum calcium occurred during an egg cycle. They found that eggs were usually laid during periods of low, constant, or descending blood calcium.…”

The Effect of the Length of Time in Production and Stage of Egg Formation on Certain Egg Quality Measurements and Blood Constituents of Laying Hens

“…Riddle and Reinhart (1926), Hughes et al (1927), Roepke and Hughes (1935), Taylor and Reed, L. J., and H. Muench, 1938 Russell (1935), Correll and Hughes (1935) and Deobald et al (1938) reported that the blood calcium level greatly increases as birds come into production. Riddle and Reinhart (1926), Hughes et al (1927), Roepke and Hughes (1935), Taylor and Reed, L. J., and H. Muench, 1938 Russell (1935), Correll and Hughes (1935) and Deobald et al (1938) reported that the blood calcium level greatly increases as birds come into production.…”

Egg Production and Body Weight Changes of Japanese Quail and Leghorn Hens Following Deprivation of Either Supplementary Calcium or Vitamin D3

“…A severe decrease in egg production and shell thickness to the point of cessation of egg production was observed when hens were fed diets restricted in calcium content (Buckner and Martin, 1920) or were deprived of supplementary calcium (Deobald et al, 1938;Mehring and Titus, 1964;Nevalainen, 1969;Gilbert, 1971Gilbert, , 1973Douglas etal., 1972;Blair and Gilbert, 1973;Gilbert and Blair, 1975).…”