Estimated breeding value on linear assessment of exterior depending on inbreeding coefficient and the level of homozygosity

Abstract. Purpose. A study was carried out to assess the influence of inbreeding coefficient, calculated according Wright – Kislovsky formula, and level homozygosityon on STR-markers indicators assessment breeding value linear exterior. Methods. The object were daughters (n = 42 245) 355 Black-and-White Holstein sires in Moscow region. calculation made taking into account at least 10 per sire. entire data array for EBV amounted 42076 heads cattle, 318 divided four groups with respect (Fx): first included outbred animals (0 %), second Fx 0…3.125, third 3.126…6.25, fourth ≥ 6.25, fifth all except outbreds. For STR calculation, total sample 306 39,590 daughters. So, group heterozygous individuals Ca 0 %, 8…50 55…77 comparison consisted 8…77 which is average 28.74 %. Results. It noted that there no significant difference “classic” by means gradation coefficient between studied animals, exception body depth, rear legs set, teat length, chest width angularity (p ˂ 0.05... p 0.001) “B” rating system. results calculations markers general had similar dependencies: angle hind side view from –0.055 0.109 third, location front nipples –0.129 0.179. regression increased along minimum number sire used terms udder height depth. Scientific novelty. time Russia, astimated conformation, depending homozygosity, markers, will be investigated.