Abstract
He significance of blood count of related breeds of the Ayrshire group of dairy cattle investigated. Information processed on the pedigrees of 181 bulls whose sperm found in 10 breeding enterprises of the RF. The average blood pressure of bulls in the Finnish Ayrshire breed was 54.2%, Swedish red - 9.9%, Norwegian red - 8.8%, Canadian - 25.7% and others - 1.4%. Bulls distributed according to the presence in their pedigrees of blood residues of related breeds of the Ayrshire group in the age aspect depending on the place of their birth and breeding enterprises, and the level of breeding value by milk of their daughters and pedigree. Most of the bulls were born in Russia and Finland (45.9 and 46.4% respectively) in their pedigrees the Finnish Ayrshire breed predominates. The ranking of bulls by official breeding value (BV) and by pedigree (BV PED ) revealed that in the best bulls according to these indicators (+100 kg and more) bloodline prevails in pedigrees by Finnish Ayrshire breed compared to the worst group (less than -100 kg). This regularity noted in pedigrees in 57.2 and 77.6% of bulls, depending on the assessment options. The BV of bulls and predicted positively and reliably correlates with the presence of Finnish blood in the pedigree (+ 0.233 * and + 0.308 **) and significantly negatively with Canadian (-0.252 * and -0.467 **). The findings are consistent with previous 2013 studies on the best rated Viking Genetics bulls.
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