Annotation

The research argues importance of the essential amino acids, including tryptophan in metabolism and productive action in poultry body of and geese in particular. It is emphasized that although standards for the quantitative use of tryptophan in the diets of different age and productive groups of geese have been developed today, they are not scientifically justified, and domestic norms differ from foreign ones. The problem of optimizing the level of tryptophan in the diets of geese is currently relevant and is of both scientific and economic interest. The geese productive period deserves special attention to the quantitative use of tryptophan from biological and economic points of view in diets, as it is associated with the intensification of metabolic processes in birds due to the synthesis of protein components of eggs. Based on the above-mentioned, the aim of our study was to establish the cost-effectiveness of using increased amounts of synthetic tryptophan in the diets of geese of the parent flock during the reproductive period.

The studies have shown that introduction of synthetic tryptophan in the diet of geese of the parent flock in the reproductive period in the amount of 0.09 g per 100 g of feed significantly improves poultry productivity such as egg production, egg weight, egg shape index and egg thickness. It was also found that the use in the diet of geese during intensive egg-laying of synthetic tryptophan in the specified amount increases the hatchability of goslings by 5.1%, and their preservation up to 60 days of age by – 2.5 %, as compared to birds that did not receive tryptophan supplements. In general, based on the obtained results, it is concluded that the increase in tryptophan levels in the feed of geese of the parent herd during the reproductive period relative to the current norms in Ukraine from 0.16 to 0.25 g per 100 g of feed is economically justified.