We studied the effect on the welfare of bulls (n=16) of their resistance to stress. The bulls with less stress resistance (group II) were in a standing position during by 53.6 minutes longer than their highly resistant peers (group I) during 24 hrs. On the contrary, the bulls of the group I rested (lying) by 87 minutes longer. The welfare of the bulls, due to different response to stress and behavioral patterns, affected sperm quality. Defect of sperm not suitable for use compared to peers of group I was higher in bulls of group II by 12.9-22.2% in the first three years of breeding.

Bioactivation of different crops grain is a promising area for improving agricultural technologies. Safe and highly effective bioactivators accelerate biological processes in grain, which must be taken into account when using it in feeding farm animals. The scientific work objective was the selection of safe bioactivators that would not have a negative effect on animals. The use of organic acids was proposed such as citric, malic and grape with a given concentration of active substances. This technological solution allows to intensify the biological processes in the grain material, namely, to cause the enzymatic depolymerization of grain or the crops germination intended for animal feeding. In addition, fruit acids partially disinfect the grain surface and inhibit the development of pathogenic microflora. The presented organic acids and their solutions are recommended for processing grain before feeding, by spraying or one-time soaking in aqueous solutions of these acids. The studies were carried out on the basis of the scientific and production laboratory for determining the quality of grain and grain products of the Dnieper State Agrarian and Economic University. Growth stimulants were characterized by a stable effect and low toxicity. They can be used both in agriculture and in the bioactivated grain production for other technologies.