Analysis of Productivity Indicators and Reproductive Qualities of Cows Taking into Account Blood Relationship and Origin
An analysis of milk producing ability indicators and reproductive qualities of purebred and high half-bred Holsteinized cows of the Yaroslavl breed in the conditions of one of the breeding plants of the Yaroslavl region is presented. Purebred and mixed bred mature cowbanes with three completed lactations were selected as the subject of research. Animals were divided into three groups: group 1 - the purebred Yaroslavl cows; group 2 - with a blood relationship of 75% (3/4 by Holstein) and group 3 - 76% or more (average 83.0%). The largest yield for the third lactation was observed in a group of cows with a blood relationship of 76% or more, the difference with purebred cows was 1081.95 kg (P ≥ 0.999). Purebred Yaroslavl cows have the highest fat content - 4.78%. The long service period is observed in cows with a blood relationship of 75% for the Holstein breed and is 117.2 days. This group is somewhat inferior in birth rate index to purebred cows and cows with a blood relationship of 76% or more. The researches have shown that the Yaroslavl purebred and high half-bred Holsteinized cows have good reproductive qualities.