The aim of this study was to make ethological evaluation of four areas of biological needs of animals, which are loose locomotion, social contacts, resting place and conditions and lack of indications of discomfort, and to evaluate a completely new technological solution for Bulgaria; a project carried out in a large farm building for 500 dairy cows in the Town of Tvarditsa. The study showed that the building had provided the necessary conditions for free locomotion and free choice of all behavioral activities, which had led to effective use of premises of areas more than 92 per cent. Furthermore, a stable hierarchy in the groups and a lack of conflicts were recorded. It can also be seen that there were good conditions for rest and animal welfare. Therefore no symptoms of discomfort were noticed. The technology is given the highest grade of 4-grade scale, which means that it is highly satisfactory in all biological needs of animals and it is beneficial and effective as well.