FEATURES OF EMBRYONIC DEVELOPMENT OF ROCK-DOVE ( <I>COLUMBA LIVIA</I> GM.) AS REPRESENTATIVE SEMIALTRISIAL OF ECOLOGO-PHYSIOLOGICAL GROUP OF BIRDS
It is shown that in the dynamics of reduction of free protein during embryogenesis of Rock-Dove there are two age groups, which are used during periodization of embryogenesis. The growth rate of morphological (skeletal) structures in the embryo meets their environmental needs.