H. Lukanov, D. Alexieva Abstract. 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

Influence of photostimulation at the end of the egg laying period on layer hen productivity M. Kabakchiev , D. Alexieva, A. Genchev