Fedorovich E. Selection-genetic and biological features of western interbreeding type of the Ukrainian black-and-white dairy breed of cattle

The complex study of age-old dyhamics of growth and development ahd linear growth of animals, exterior- constitutuonal features, forming of beef and milk productivite, influencing of mother, father, intensity of growth and development, age of the first artificial insemination and first calving on forming productivity of cows are first considered in the dissertation. Influecing of duration of periods of dry, service and intercalving on milk productivity and character of lactation curve of highly productive cows were established. The part of influence of the gehotype, mother and father on forming of productivity and longevity of animals and influeence of tne five sources of the five sources of information oh the pedigree value of sires were estabished as well as influence of the genotype ahd parehts on growth and development of animals.