Serum clinical biochemical markers of Hy-Line W-36 laying hens under the influence of increased stocking densities in cages of multilevel batteries

Today, the organism of hens is constantly exposed to numerous technological stressors in conditions industrial poultry farming, least studied which are long-term, can cause development chronic stress. One such increased stocking density hens, also a way saving resources egg and often used by producers obtain more eggs per 1 m2 area. The aim this study was examine effect overcrowding, as factor stress development, on body modern high-performance cross, necessary select best ways keep them. Four groups were formed for purpose, kept at different densities, according European standards, Ukrainian standards with increasing overcrowding. In way, gradually intensity stressor modeled. Long-term keeping laying high did not affect content serum total protein, albumin, urea cholesterol, within physiological norm. It found that increase compared European, accompanied an activity lactate dehydrogenase their blood. With above namely 25.3 birds/m2, there three enzymes – dehydrogenase, aspartate aminotransferase gamma-glutamyltransferase. proved further overcompaction 26.7 birds/m2 glucose, creatinine, well decrease ratio calcium phosphorus, confirmed alkaline phosphatase activity. Also, aminotransferase, gamma-glutamyltransferase observed. Thus, main effects caused prolonged densities reflected biochemical parameters serum, enzyme activity, violation phosphorus.