OPEN ACCESS OBTAINING HIGHLY PRODUCTIVE EGGS ACCORDING TO THE CRITERION OF INCUBATION. FEATURES OF KEEPING HIGHLY PRODUCTIVE POULTRY Olga Loretz, Nadezhda Lopaeva, Olga Gorelik, Pavel Sharaviev, Tatiana Burtseva, Olga Badova, Olga Neverova, Inna Khayrova, Alina Akhmetyanova