According to the current norms (DSTD-AIC-04.05.) the density of keeping chickens in cages should be 22–25 hens/m2, which corresponds to their provision with an area in the range of 400–450 cm2/hen. This level of housing density does not coincide with the slightly more comfortable (13–20 hens/m2, or 490–750 cm2/hen) established in the United States and EU countries for chickens of modern egg crosses (Council Directive 1999/74/EC). Therefore, it is important to study the egg productivity of chickens of industrial flocks in 6–15-tier cages batteries at a density in accordance with domestic and European standards. In the conditions of the modern industrial poultry complex in a comparative aspect two variants of the maintenance of laying hens in cages of 12-tier ba
laying hens, planting density, egg production, viability, live weight, egg weight, European efficiency ratio