INFLUENCE OF INBREEDING ON PRODUCTION TYPES OF GRANDDAUGHTERS OF DIFFERENT MANUFACTURING BULLS
Industrial technology of livestock production require high uniformity of animals, concentrated in a single facility or farm, and it is therefore necessary to strive to reduce the variability of main selection traits resulting from the use of purposeful inbreeding. The aim of the performed research was to study the effect of inbreeding on productive types of Mature (3 calving) cows Swiss breed of dairy complex "Kenzhe" Kabardino-Balkarian Republic. As a test material the materials used zootechnical and pedigree records on animals, obtained as a result of close inbreeding (II-II) on sires Fanny 62 and Fico 51. There were formed four groups of cows: inbred (n=18) and outbred (n=26) group granddaughters of bull Fanny 62; inbred (n=12) and outbred (n=16) group granddaughters bull-the manufacturer of Fico 51. Outbred granddaughter of bull Fanny 62 surpassed their inbred relatives for the yield of milk per lactation at 245 kg, or 8.5%, milk fat - 9.7 kg, or 8.4%, live weight - 26.2 kg, or 5.8%, a rate of milkiness - 16.1 kg, or 2.5%, the production ratio of typicality - 0.47 absolute units. On butterfat compare groups of cows did not differ. Among the descendants of the bull-the manufacturer of Fico 51 the highest milk yield per lactation, milk fat and live weight were characterized inbred granddaughter, from whom these figures were higher than in outbred granddaughters, respectively, by 149 kg, or 5.1%, 1.8 kg, or 1.5% and 42.5 kg or 9.0%. After analyzing the distribution of inbred and outbred granddaughters of different sires for production types, found that among outbred descendants bull Fanny 62 the proportion of animals dairy production is almost 2 times higher than among inbred grandson. At the same time, among inbred grandson of the bull Fanny 62 the proportion of animals for meat and milk type is 1.9 times higher than among outbred offspring. The use of purposeful inbreeding on the sire in some cases may be accompanied by increased milk production, while reducing the specific weight of animals of necessary dairy type, which must be considered when conducting breeding work with each herd.