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The problem of the preservation and practical use of rare breeds and populations of poultry is reviewed on the example of Russian White chicken breed that could be used for the selection of the specialized populations of chicken as the producers of raw materials for the bioindustry The urgency of this task is related to the problems of import substitution, adverse epizootic situation in the World\'s poultry production, and recent COVID-19 pandemia The results of selection of a population of Russian White breed for higher output of the extraembryonic fluid (EEF) from 12 5-day old embryos in 5 generations are presented, with the criterion no less than 0 200 mL of EEF per 1 g of egg weight and lo less than 1 0 mL per embryo The increase of EEF output in the selected population was also achieved via the selection for higher egg production and egg weight resulted in the increases in egg production by 15% and egg weight by 10% The absolute output (mL/embryo) of EEF was increased by 14%, relative output (per 1 g of egg weight) by 8%;bioactivity of the Newcastle disease virus in the EEF increased by 11 5% The percentage of individuals with high EEF output was increased by 25 2% in average The virological investigation of embryos of the selected population evidenced their suitability for the production of certain vaccines and diagnostic kits
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New possibilities of the preservation and practical usage of rare breeds and populations of poultry: the case of Russian white chicken breed
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