Kudrin Izhevsk State Agricultural Academy INFLUENCE OF PRE-STARTER AND STARTER FEED COMPOUNDS IN SUCKLING PERIOD ON GROWTH AND DEVELOPMENT OF HOLMOGORSKY BREED HEIFERS The article presents information on the replacement heifers growing technology of Holmogorsky breed from birth to 18 months while feeding in the suckling period with pre-starter and starter feed compounds. <...> Their positive impact on the growth and development of heifers is revealed. <...> The highest feed consumption was observed in the experimental group, as feeding in the suckling period with pre-starter and starter feed compounds promoted better feed edibility with its high nutritional value and balance. <...> This was refl ected in the growth and development of the experimental heifers. <...> With the same live weight at birth the average live weight of 6 month old heifers in the control group was 161 kg, in the experimental group – 189.3 kg, that is higher than in the control group by 28.3 kg, or 17.59% (P<0.001). <...> Key words: replacement heifers, content, live weight, pre-starter and starter feed. <...> Izhevsk State Agricultural Academy (9, Studencheskaya street, Izhevsk, Russian Federation, 426069, e-mail: nata.zootex@yandex.ru). <...> Izhevsk State Agricultural Academy (9, Studencheskaya street, Izhevsk, Russian Federation, 426069, e-mail: kudrin_mr@mail.ru). <...> УДК 636.2.082.453.52 А.И. Любимов, Е.Н. Мартынова, Е.М. Кислякова, Ю.В. Исупова, В.М. Юдин ФГБОУ ВО Ижевская ГСХА ВОЗРАСТНЫЕ ИЗМЕНЕНИЯ КОЛИЧЕСТВЕННЫХ И КАЧЕСТВЕННЫХ ПОКАЗАТЕЛЕЙ СЕМЕНИ БЫКОВ-ПРОИЗВОДИТЕЛЕЙ РАЗНЫХ ЛИНИЙ Роль искусственного осеменения как мощного ускорителя генетического прогресса в животноводстве, и в частности в молочном скотоводстве, неизмеримо возросла после того, как его удалось объединить с оценкой производителей по качеству потомства. <...> Результаты искусственного <...>