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The object of research was an array of breeding mares of the newly created Ukrainian trotting breed group of horses, registered as of 01.01.2023 (n=194). 91.6% of all breeding mares were tested on racetracks with an average liveliness of 2.12.9 min. The quantitative and qualitative indicators of the investigated array, the genealogical structure, and the effectiveness of genealogical combinations were determined. The liveliest mares were selected for breeding stock of the Dibrivskiy stud (average liveliness 2.08.2±0.86 min.). In prize-winning precocity, mares of Zaporizhskiy stud with a high probability (p |
