Tatueva O.V., Kol’tsov D.N. Influence of Paratypical and Genetic Factors on Milk Productivity and Duration of Cows’ Productive Life in Smolensk Oblast Conditions. Agricultural and Livestock Technology, 2021, vol. 4, no. 2. DOI: 10.15838/alt.2021.4.2.2 URL: http://azt-journal.ru/article/28951?_lang=en