Within certain conditions especially feeding Bovine somatotropine (BST) allows an increase in the yield of dairy cows. Budget studies of representative situations have shown that this product may further intensification in dairy farms, in spite of the restraint of quotas, and provided that substitution activities be introduced, and production be diversified. Being flexible in use, BST can be employed either systematically or in particular instances. Recording to BST revives political, economical and sociological debates about the future of cattle farms, and more generally of agricultural sector.
