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This paper discusses the use of feed additives with the addition of amino acids containing methionine and cysteine. To study the effectiveness of the use of feed additives, one of the main functional systems of the body of any animal, blood, was monitored. In confirmation, blood samples were taken for hematological and biochemical examination. It is shown that in the first months of use there is an increase in the weight of ducks, and in the period of egg production there is a decrease in productivity. Reduced productivity is associated with the preparation and restructuring of the body for egg production. New approaches to the development of feed additives are needed to assess the state of health and predict the quality of products. Great importance is given to standard methods of studying and identifying certain patterns in the clinical, anamnestic, morphological, metric and anatomical parameters of the bird body.

The Influence of different growing modes on the physiological state of mulard ducks