Abstract
The results of morpho-biochemical, immunological studies and data on the antioxidant status of young laying hens of Czech Dominant breed when including “Profort” feed additive in the ration are presented. The study was carried out in the conditions of the poultry farm of Krasnoye Podvorie farm in Belgorod region. The chickens were divided into two groups: experimental and control. Young birds of the control group received the main ration. As for the experimental group, “Profort” feed additive, which contained Bacilius megaterium B-4801 and Enterococus faecium l-35, was used at a dose of 0.5 kg / t in combination with the main ration. Blood samples for research were taken on 11, 21 and 42 days. In the course of the studies, a positive effect on morpho-biochemical, immunological parametres and parametres of antioxidant defense system of egg cross chicken blood when using “Profort” probiotic was revealed. A decrease of the content of monocytes, eosinophils, lymphocytes and pseudo-eosinophils was noted throughout the entire period of the study in blood of young birds of the experimental group, compared to the control group. The concentration of alpha-globulins in the blood of birds of the experimental group was higher throughout the entire period of the study relative to the parametres of the control group. The maximum difference in immunological parameters of the blood of birds of the experimental and control groups was achieved on the 42nd day of the study. So, lysozyme activity of blood serum of young laying hens of the experimental group was higher by 18.8%, and the content of CIC and general Ig - by 30.7% and 21.9%, respectively. A decrease of medium molecular peptide level in blood shows a positive effect on the antioxidant status of the organism
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