INFLUENCE OF THE DEGREE OF INBRED MARES OF VLADIMIR HEAVY-DUTY BREED ON THEIR DEVELOPMENT AND WORKING QUALITIES
Horses of domestic heavy-duty breeds, including the Vladimir one, are the main improvers in working horse breeding. Vladimir horse breed belongs to a group of breeds with a limited gene pool. Therefore, due to the small number of stallions at the stud farm, one involuntarily has to use inbred pairing of horses. The purpose of our work was to study the influence of the degree of inbred mares of the main lines of Vladimir heavy-duty breed on their development and working qualities. It was found that inbreeding has been used at the stud farm for a long time. 39% of mares were obtained using close inbreeding, 29% - close, 24% - moderate and 8.0% remote. A definite relationship has been established between the degree of inbreeding and the development of mares of various strains. The best development was found in mares which were obtained using moderate inbreeding, and the worst - using close one. The degree of inbreeding also influenced the performance of mares. So mares with the use of moderate inbreeding within 15.24 minutes were distinguished by the best agility when delivering the load in step and trot. and 5.59 minutes. and a distant 16.20 min. and 6.12 minutes, and a greater draft endurance when moving a load of 10 tons, mares obtained using close inbreeding - 524.2 meters. The highest grading points for typicality, origin and development, and, consequently, breeding value, were given to mares obtained with the use of moderate and distant inbreeding, and less valuable with close inbreeding. To reduce the inbreeding of the livestock, it is necessary to exclude the use of close inbreeding.