ESTIMATION of COWS of HOLSTEIN BREED With the HIGH PRODUCTIVITY ON EXTERIOR And to development of thorax
In the article the results of linear estimation of cows of Holstein breed are presented on an exterior depending on a constitution which was defined on correlation of volume and the masses of body, that on a coefficient (VMC), taking into account the area of thorax after shoulder-blades and after the last rib, lengths of thorax and living mass, and which was expected in the litres of volume of thorax on the kilogram of mass of body of animal. On deviation of 0,67σ from a mean value VMC the grown man cows of high productivity are differentiated on three types: with a coefficient less than 0,58 l/kg small volume, more than 0,64 l/kg - large volume, other - middle a volume constitution. The results of linear estimation of exterior were rotined by the best operating qualities (development of udder, temperament), capacity for forming of the high suckling productivity (measurings of trunk and thorax), providing of satisfactory reproductive ability (angle of slope and width of the back) for the cows of Holstein breed at which a coefficient (VMC) was 0,58 l/kg and more. At the same time, the selection of cows with high OVK will not result in deviation of body in a meat type (r = - 0,040±0,141; Р<0,95).