Age dynamics of growth and development of chichens depending on protein metabolism

In order to carry out the planned research, an experiment was carried out on repair young animals of the laying chickens of the «Hayseks Brown» cross from the one day-old age. For this purpose, in the conditions of the farm «Berkut» of the Drohobych district of the Lviv region, an industrial herd of hens in the amount of 10 thousand heads was formed. Poultry was kept in cages with free access to food and water. The temperature and light modes corresponded to the recommended standards and the content met the requirements of the technology. All poultry received a complete food, balanced for all nutrients and biological active substances. We have studied the dynamics of growth and development of chicken egg production of line cross «Hayseks brown» from day age to the age of peak performance. During the experiment, the study of the intensity of metabolic processes in the body of 6, 35, 90, 120, and 150 day-olds, i.e., in critical periods when there is intense growth of feathers and juvenile molten (30–60 days), the beginning of the oviposition (120 days) and the beginning of an intensive oviposition (150 days). In these age periods, the level of soluble proteins, amine nitrogen, and the activity of alanine and aspartate aminotransferases were determined in liver tissues, cuticles of the muscular stomach, gastrointestinal mucosa, gastrointestinal mucosa, duodenum and pancreas. During the growth and development of chickens, there are critical periods associated with intense growth of feathers (21–35 days), juvenile strain (70–84 days) and the beginning of oviposition (119–126 days). The highest protein content was found in liver and pancreatic tissues (11.08–13.8 mg/g), lower (by 40%) in the tissue of mucous membranes of the glandular stomach and duodenum and 4–5 times lower content in the tissue, the cuticles of the muscular stomach of the chicken in all the periods of growth we were studied. The age dynamics of changes in the activity of AlAT and AsAT was uneven in the tissues according to the study. Reduced AlAT activity at the 30-day age, similar to protein concentration, which is characteristic of liver tissue, 12-gullet mucosa and pancreatic of chicken. The results of biochemical studies are related to changes in the physiological state and magnitude of gains. During the growth of repair young poultry, in the critical periods of growth and development, it is necessary to deliberately affect the processes of protein metabolism by enhancing the processes of digestion and assimilation of nutrients and biologically active substances of fodder and the sufficient introduction of free amino acids by the use of exogenous enzyme preparations.