Exterior and constitution of yaks bred in Bulgaria

摘要

A classification was made of the skin colour and the hair cover of yaks, bred in the Republic of Bulgaria.The exterior dimensions, the indices obtained and the linear profile of the populations of yaks in the Republic of Bulgaria are examined. The necessity of studying the exterior is conditioned by the fact that it is an external expression of the constitution. At the age of 6 months, male animals surpassed females with 3.6%, at 12 months the prevalence was 5.6%, and at 36 months the difference wassignificantly greater 11.6%. The growth capacity and the relation to the animal constitution were analyzed. At the age of 12 months, live weight ranged from 147.66 kg for females up to 167.53 kg for male animals. At the age of 36 months, the live weightwas 328.87 kg for males and 265.47 kg for females. It was 331.60 kg for male animals at the age of 60 months and 278.04 kg for females.