Role, Importance and Peculiarities of Record Cows in the Formation of High-Production Herds

Throughout the history of development dairy cattle breeding, particular importance has always been attached to identification and rational use record cows. The significance this category breeding is determined not only by individual indicators, but also effect they have on improvement breed herds, primarily through their sons and, a certain extent, as ancestors families. It should be noted that appearance cow hardly ever spontaneous or random; rule, valuable are found in pedigrees, potential which can manifested descendants when creating appropriate feeding milking conditions. In regard, human factor very important. This analysis shows recent years, age highest productivity grown significantly almost all breeds. seems phenomenon result widespread Holstein cattle. If one looks at origin stud bulls, sperm offered for reproduction, then them obtained from first-calf heifers, few adult hard escape conclusion we replicate animals advance, wonder why cows do time recoup themselves reach classical milk – 3-5th lactation. Long-term studies show yield purebred herds marked 2nd lactation, then, if survive, decreases. opinion among Russian livestock breeders, including scientists, blame everything. Of course, level type foundation animal health, many farms provide 7-10 thousand kg per year, duration productive reduced, so there must other factors.
 Keywords: selection,