Tissue components of the domestic fowl. 3. The non-protein nitrogen of plasma and erythrocytes

Studies on Chicks fed Irradiated Animal Protein By-Products; Part II: Biochemical Studies

“…Our results confirm with those previously, showed that feeding pigs with irradiated potatoes did not affect the blood urea or non-protein nitrogen concentration in comparison with those fed the control diet (15). Also, the control values obtained in our studies agree with similar data (16,17). It was evident (Tab.…”

“…2) that the consumption of irradiated protein by-products throughout the course of the present study did not cause drastic changes in blood uric acid concentration. The values obtained were within the normal ranges (2.2-6.3 mg/dl) of chicks maintained under normal feeding conditions (16,17). The results leave little doubt that feeding chicks with mixtures containing irradiated protein by-products as main sources of protein was safe without serious effects on the elimination of uric acid, which is considered the most important end product of the oxidation of purines, dietary and cellular nucleoprotein of the body.…”

Physiology of the growing and adult goose

“…Their observations on non-laying stock were very limited. A more complete study, which confirmed that non-layers have a higher concentration of NPN in their plasma, was carried out by Bell et al (1959). The work reported here was not a comparison between laying and non-laying birds but it might be expected that the non-layers would more closely approximate males than laying birds.…”

Renal pathology of the fowl — A review

“…The normal plasma uric acid level of birds is higher than in mammals. Bokori (1965a) quoted figures from the literature for healthy fowls but these levels are subject to considerable fluctuation due to such factors as sex, feeding and egg production (Bell et al, 1959). These latter workers recorded an overall range from less than 1 to about 10 mg of uric acid per 100 ml of plasma.…”