РЕАКЦИЯ КУР-НЕСУШЕК МЯСНОГО КРОССА НА ХРОНИЧЕСКИЙ СТРЕСС В УСЛОВИЯХ РАЗНЫХ ТЕХНОЛОГИЙ СОДЕРЖАНИЯ

Abstract

Resistance to chronic technological stress is one of requirements to keep the stable productivity of animals. Stress level depends on both external factors and genetic traits of animals. Reaction on chronic stress was estimated in different housing technologies (floor and cage) of meat breed laying hens’. Behavioural, hormonal and physiological state changes can be performed as indicators of stress. Pair bone asymmetry may be connect with animals’ susceptibility to stress. Illustrated that for estimation of animals’ state the complex approach is essential when detected differences and trends permit to compare housing conditions in poultry or in husbandry. High corticosterone concentrations and high individual differences, increase levels of triglycerides and cholesterol are indicated higher unit of stress in cage housing system. Morphological traits’ variability is small and generally not related with asymmetry level of laying hens. Some tibia and femoral bones length reduction can be associated with chronic technological stress level increasing of laying hens located in cages. There are no detected significant differences through summary skewness between groups. Alongside there is substantially minor percent of symmetrical individuals located in cages. Thus, biochemical and hormonal state, morphological traits estimation showed decreased chronic stress levels on laying hens across floor housing technology. Despite the observed signs of homeostasis instability, there are high reserves of adaptive abilities inherent in the selection of initial forms and hybridization scheme demonstrated by hens.