Pavlyuk M. Age peculiarities of sexual function formation of Podilsky plant type black-dappled dairy breed

The object of research: the formation of sexual function of Podilsky plant type bulls of Ukrainian black-dappled milk breed. The aim of research: to show the dynamics of the development of sexual glands and the formation of spermatogenezis processes of bulls in accordance tu their age and to make propositsons according to their rational and effective usage. Methods of research: morphological, histological, physiological, biochemical, zootechnical and statistical. Scientific novelty: Complex researches of age dynamic development of secsual organs, morfo-histological and fiziologo-biochemical character of testes and sexual glands in the process of spermatogenezis development of bulls were carried out for the first time. Guantitative and qualitative indicators of spermoproduktivity of buls-sirses according to their age and intensity of growth and development were studied firstly too. The stage of usage: it is proposed to use empiric equation of regression for making predictions and evaluations of bulls secsual activity. It is necessary to use bulss-sires of mantioned above plant type intensivеly untill age 6. The sphere of usage: breedreproduktors, breedenterprises, higher educational establishments according to the directions of their training "The technology of production and processing of animal products and "Veterinary medicine.