To the question of identification of adult breeding poultry stock

It is necessary to identify each individual in flock clearly and accurately within the measures for breeding poultry evaluation and further productive evaluation and selection. Identification errors are vulnerable data bases forming. This database using for breeding poultry selection and other stages may be cause of breeder wrong decision and bring to naught all efforts undertaken. Various methods of poultry marking are being compared in the paper. The new construction of leg tag is presented.