И. А. Сазонова The studies were conducted on Ross 308 cross broiler chickens to evaluate the effect of phytobiotic feed additives based on essential oil herbs ( nigella, coriander and milk thistle ) on growth, metabolism and meat productivity. The feed additives were introduced in the main diet at a level of 1-2%, replacing part of the diet. During the experiment, the dynamics of live weight and feed conversion were monitored. The end of the technological cycle was considered after 48 days. Before slaughter, the pre-slaughter weight was determined and blood samples were taken. Differences in the studied characteristics were recorded depending on the type of feed additive. There was a 7% increase in the number of erythrocytes in the blood and a 5% increase in the hemoglobin level in chickens whose main diet was supplemented with a mixture of nigella and milk thistle. Broilers consuming a mixture of milk thistle with nigella and coriander had higher levels of protein metabolism and decreased levels of aminotransferase enzymes. By the end of the experiment, the increase in live weight of the broilers in the 2nd experimental group ( addition of coriander ) exceeded all groups of birds. The highest feed consumption was observed in the control poultry group. There was a decrease in the cost per unit of increase in live weight of broilers with the addition of a mixture of nigella and milk thistle to their diet. The maximum slaughter yield was observed in birds of experimental group 3, where a mixture of nigella and milk thistle was added to the diet.
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