The materials of the International Scientific and Practical Conference “Ways to extend the productive life of dairy cows based on optimization of breeding technologies for animal maintenance and feeding” held on May 28-29, 2015 . The conference was held on the basis of the All-Russian Research Institute of Livestock Production . L. K. Ernst . Representatives of 18 regions of Russia and 5 CIS countries took part in the work . The collection includes 4 sections: section I. Breeding, breeding and content technology; Section II. "Biology and Biotechnology"; Section III. "Feeding and Feeding"; Section IV. "The Economy" (DT)