Selection aspects of increasing the terms of productive use of cows of Ayrshire breed

The article presents the research materials concerning the terms of productive economic use of Ayrshire cows bred in the Vologda region. The differences of animals of different genealogical lines of Ayrshire cattle on the number of lactation, milking days and milk life productivity were revealed. The influence on the specified indicators of various options of breeding animals' selection is established. Recommendations on improvement of selection and breeding work with Ayrshire cattle breed are given