Under optimal stable environment conditions an optimal utilisation of feed for animal growth and development is attained. The objective of good breeder should be to keep animals within their zone of thermal neutrality determine by the lower (LCT) and upper (UTC) critical temperatures. Within this range of temperatures, heat production is minimal and the energy available for production is maximal. It is one of the strategic parameters, which determine the health of the animals and presumption of accomplishment the optimal production and reproduction parameters, as one of the premise of economical rentability of breed. The presented work is focuses on the analysis of selected aspects of relations between the organism and bioklimate – creating optimal conditions for breeding environment in farm animals.