DOI: 10.26155/vet.zoo.bio.202007008
UDC 636.22 / 28.082
Authors
O. V. Tulinova
Candidate of Agricultural Sciences, Leading Researcher of the Laboratory
of Genetics and Breeding of Ayrshire Cattle; All-Russian Research
Institute of Genetics and Breeding of Farm Animals – branch of
Federal Scientific Center of Animal Husbandry –
VIZH named after Academician L. K. Ernst,
Saint Petersburg, Russian Federation
A. V. Petrova
Junior Researcher at the Laboratory of Genetics and Breeding of
Ayrshire Cattle; All-Russian Research Institute of Genetics
and Breeding of Farm Animals – branch of Federal
Scientific Center of Animal Husbandry –
VIZH named after Academician L. K. Ernst,
Saint Petersburg, Russian Federation
Abstract
The research was conducted on the data of 10 heads of animals of the Leningrad population of Ayrshire cattle, estimated by the BLUP method, which completed the first lactation in 2014– 2018. The analysis of the studied sample was performed on four classes of BV weighing 13 months: I – less than –035 kg; II – from 10 to –30,0 kg; III – from 30,0 to +0,1 kg; IV – +0,0 and more. The difference of BV in milk yield, milk fat and protein yield in cows lagging behind by more than –29,9 and from –30,0 to –30,0 kg (+15,0 and +30,0; +12 and +19; +0,2 and +0,1) and ahead of peers by 0,0 – 0,2 and 15,0 and more kg (+29,9 and +30,0; +61 and +74; +1,7 and +2,2). The strength of the influence of the intensity of development of heifers on BVBLUP on milking 1,8%. In cows with more intensive development at 2,2 months decreases the number of animals with BVBLUP on milk yield less than –32,2 kg of milk by 10% (from 100 to 9,6%) and increases with BVBLUP on milk yield +29,4 kg and more by 19,8% (from 100 to 8,7%). Therefore, heifers with an average live weight of 33,2 months should be left or in excess of 41,9 – 10 and 15,0 or more kg.
Keywords
Ayrshire breed, intensity of heifer development, Breeding Value, BLUP Animal Model, milk yield.
