Calcium binding protein in the turkey and in the Japanese quail

Detection of immunologically similar calcium binding proteins (CaBP) in the duodenum and the uterus of both laying turkey hens and laying Japanese quail by a 45 Ca binding assay yielded results highly correlated with the actual concentration of CaBP measured by radial immunodiffusion. Levels of duodenal CaBP in laying turkeys maintained on normal laying hen rations are lower than those found in hens just starting egg production and than laying hens fed a Ca-restricted diet for one month.