EFFICIENCY OF SELECTION MODELS ACCORDING TO GENEALOGICAL GROUPS IN OBTAINING BREEDING MARES IN THE ORLOV’S TROTTER OF THE UKRAINIAN POPULATION

The object of research was the Ukrainian massif breeding mares Orlov’s Trotter, registered on January 1, 2022 (n=194). 75.1% (145 mares) all were tested hippodromes. It determined that there low-level negative correlations between mares' agility indicators and body measurements. However, positive relations established analyzing record measurements different studs. at Kyiv Hippodrome with a high probability (p>0.95-0.99) prevailed in terms herdmates Odessa Hippodrome, both revealed age periods. There found 299 Trotters 2.10 min class more lively, which 25 horses entered 2.05 faster, 2 - to 2.00 faster during selection period from 2001 2021. population not be fastest mare modern reproductive composition is Antalya 2.05,7, gray, 2014 (Aphorism Artistka) Dibrivsky stud. Of mares, only 13.8% have faster. predominant number mare’s class’s 2.10.1-2.15.0 (31.1%) 2.15.1-2.20 (24.1%). Based analysis pedigrees, it domestic Trotter structured according 8 genealogical lines 32 maternal families. most developed region stallions Barchuk-Zapad line (40.6 31.4%, respectively). largest comes Barchuk-Zadap Pion lines. highest for distance 1600 m belongs Voin (136.6±1.75 s), Barchuk (136.8±1.25 Ispolnitielny (137.3±4.19 Boltik (137.6 ±5.11 s) Pilot (137.7±2.44 precocious (the 2-year-old mare) are Ispolnitielnyi (145.7±3.78 (147.3±1.27 (147.8±1.45 53 combinations recorded studied array mares. numerous interlineal × (13 mares), Zapad (taking into account branch originates line) (9 as well crosses (10 mares). In agility, obtained (134.1±3.07 (134.6±3.89 (134.8±4.76 s). Thus, these effective selecting parental pairs obtain population.