The Distribution of Blood Calcium in the Circulation of Laying Hens

Calcium and Phosphorus Metabolism and Egg Shell Formation in Egyptian Birds

“…From Tables 3, 4 and 5, blood calcium during egg formation showed marked variation; there were high values during shell formation and low values when the shell was complete. This is in agreement with Buckner et al (1930) and Charles and Hogben (1933). The lower values of shell calcium/g.…”

“…Increases in blood calcium at the time of ovulation have been noted in the domestic fowl by Hughes et al (1927) and Russel et al (1930). Buckner et al (1930) and Charles and Hogben (1933) found that there were high blood calcium values during shell formation and low values when the shell was complete. Laskowski (1934) has found that the total plasma phosphorus for laying hens was very high but shows marked variation.…”

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

“…Common (1936) has shown quite wide variations in calcium content of the blood of individual hens over a four-month period when samples for analysis were taken at approximately monthly intervals. Riddle (1926) working with pigeons, and Roepke and Hughes (1935) working with laying pullets, have reported a marked rise in total serum phosphorus when the well known (MacOwan, 1932;Buckner, Martin, and Hull, 1930;Greenberg et al, 1936).…”

Feeding Estrogen (Dianisylhexene) to Laying Hens

“…(Lorenz etal., 1938). Buckner et al, (1930), Macowan (1932), and Charles and Hogben (1933) found the serum calcium level of laying hens markedly above that in non-laying and immature birds. Riddle and Dotti (1936) demonstrated that estrogens caused significant rises in serum calcium in both doves and fowls (see also Avery, Scott & Conrad, 1940).…”