Vengryn A. The age dynamics resistance and its regulation in heifers of the different breeds.

Object of a research: heifers of Ukrainian Black-and Red-Dappled milk breed and Black- Dappled and Simental breeds, blood, exter. Measure the bulk of animal. Methods of researches and equipment clinical, physiological, haematological, immunological, biochemical, erytrochemometr, microscope, refractometre, Means of electroforres squirrel. Theoretical and practical outcomes: ficsed, that animal new-grows of breeds, in particular Ukrainian Black- and Red-Dappled paternal - Black- Dappled and Simental, differ by high index of resistance and productive, which are shown in conditions of the normalized feeding, and the contents. The feeding this biological-active substance in heifers the Ukrainian Black- and Red-Dappled milk breeds and increase of immune reaction, stature and development, in particular near unfavourables conditions rear and feed the animals. The orb (area) of use is physiology and stock-breeding.