[Concentration of free nucleotides and turnover of adenine nucleotides in the liver of birds of different ages].

The content of free nucleotides and exchangeability of adenine nucleotides were studied in the liver of 1- and 18-month cocks. It is established that adenine nucleotides in the young cocks liver account for 40%, uridine nucleotides for 29%, cytidine nucleotides for 13% of the total amount of nucleotides. These ratios are maintained with age but the amount of adenine nucleotides decreases by 35% and that of uridine nucleotides by 22%.

[Carboxylation intensity in the liver of birds of different ages].

Carboxylation intensity was studied in the liver of young and adult cocks, 14C-bi-carbonate was used as an indicator of the amino acids, proteins and lipids turnover. It is established that the amount of dry residue in the liver tissue of the adult cocks is 22% higher and that of pyruvate and dicarboxylic amino acids is twice as low. The relative weight of the liver changes with age: in the 18-month-old cocks it is 1.