Sanzhara R. Biological and economic features of different types stressresistant black and white diary cow breeds in Ukraine steppe zone

Object of researches - the stressresistant cows of the Ukrainian black-pied milk breed. The purpose of researches is determination of effectiveness of selection of cows of the Ukrainian black-pied milk breed on stressresistant. The methods of researches are zootechnic, laboratory, morphological and biometric. Results of researches: 1. For a theory - First, on the basis of results of complex researches of productive and technological qualities and morfofiziologic signs, expedience of selection on stressresistant with the purpose of more effective breeding of cows of the Ukrainian black-pied milk breed in the conditions of steppe area of Ukraine is experimentally proved. 2. For practice - it is Set, that high level of stressresistance individuals (A І and ІІ type) combine the promoted productivity and good reproductive power and are most perspective for the subsequent breeding. Milk from high level of stressresistance cows is characterized by more low maintenance of toxic elements and radionuclide. A colostrums from these animals contains more of immunoglobulin comparatively with low level of stressresistance persons of the same age. Also from them more viable calve with higher morphofunctional status are received. The sphere of the use is the economies on growing of cattle of Ukraine.