The State and Partition of the Calcium and Inorganic Phosphorus in the Serum of the Fowl. Effect of Growth and Ovulation

Physiology of the growing and adult goose

“…Sturkie and Newman (1951) and Brandt et al (1951) found sex differences in the level of serum proteins in adult chickens. The former did not confirm Greenberg, Larson, Pearson and Burmester (1936) that layers differed from non-layers. According to Sturkie (1954) sexually mature hens, whether they are laying or not, produce sufficient oestrogens to elevate their serum proteins.…”

Normal Hematologic and Biochemical Values for Prelaying Greater Sage Grouse (Centrocercus Urophasianus) and Their Influence on Chick Survival

“…20 Phosphorus levels increase when birds approach egg laying, 22 which likely accounts for the increase in P values in birds in this study. However, values for P in some birds in this study may not be within normal values for hens approaching egg laying because some hens had Ca : P ratios that exceeded 3:1, some nearly 4: 1.…”

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).…”