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Effect of Fasting, Refeeding and Dietary Protein Level on Uric Acid and Ammonia Content of Blood, Liver and Kidney in Chickens

Laboratory of Animal Nutrition, Nagoya University, Nagoya, Japan

The effect of graded levels of dietary protein on ammonia and uric acid concentration in blood, kidney and liver of single comb White Leghorn cockerels was investigated. The concentration of uric acid in the blood plasma was increased pro-portionally to the increased protein level of the diet, and the highest value was obtained 2 hours after feeding. The blood ammonia concentration was also increased, but to a lesser degree than for uric acid, by feeding 15 to 40% casein diets, whereas zero to 10% casein diets did not affect the blood ammonia concentration. Fasting for an extended period caused a marked increase in plasma uric acid concentration; 72 and 240 hours after beginning the fast the plasma uric acid concentration reached approximately 10 and 40 times the initial concentration, respectively; the rise in uric acid concentration was reduced to normal within 6 hours after refeeding. Ammonia and uric acid contents of both liver and kidney increased gradually with the increase of dietary protein level. Kidney ammonia content per unit weight was twice the liver ammonia content, whereas total ammonia content was equal in liver and kidney. On the other hand, uric acid contents of liver and kidney per unit weight were not significantly different, whereas total uric acid content of liver was twice that of kidney.

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