INFLUENCE OF TONE OF AUTONOMOUS NERVOUS SYSTEM ON GROWTH INTENSITY IN CHICKENS

The autonomic nervous system regulates the work of internal organs and the intensity of metabolic processes in animals and birds. However, the question of the influence of autonomous balance types on the productivity of chickens is insufficiently studied. The aim of work was to study the growth intensity of broiler chickens depending on the typological features of the tone of the autonomic nervous system. Cobb-500 cross-breed meat-producing chickens were used for the study. To study the typological features of autonomic tone in the experimental bird, an individual electrocardiogram was recorded, and one hundred R–R cardio intervals were calculated, which were processed by the method of variation pulsometry according to R.M. Baevsky. This allowed to divide all chickens into three groups: sympathotonics, normotonics and vagotonics. To determine the influence of the types of autonomic nervous regulation on the increase in live weight, the birds were weighed at 35 and 60 days of age and the indicators characterizing the growth intensity were calculated. As a result of the conducted researches it was established that the live weight in chickens-vagotonics of 35 days of age is probably higher by 11.29% (p<0.05) than in chickens-sympathotonic. At the age of 60 days, vagotonic hens probably prevailed (p