Анотация: A study was performed on 6 groups of 12,000 commercial hybrid layers - Isa Brown, Lohmann Brown and Lohmann LSL Classic, housed in conventional and enriched cage systems in a poultry farm at the village of Polikraishte. It was established that Lohmann LSL Classic hybrid layers housed in enriched cages exhibited higher egg production than those kept in conventional cages. For the Isa Brown and Lohmann Brown hybrids, the production system used did not have an influence on egg production. The eggs` weight in the three studied hybrids - Isa Brown, Lohmann Brown and Lohmann LSL Classic was not affected by the rearing technology. The housing in enriched cages resulted in higher feed consumption in the Isa Brown and Lohmann Brown hybrids compared to housing in conventional cages. The mortality rate for the three hybrids housed in enriched cages was lower, yet feed conversion was higher compared to conventional cages. The plumage condition of the three hybrids was worse at the end of the egg-laying period in conventional cage systems