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The aim of the studies was the collection, splitting and transfer of halves of equine embryos in order to obtain monozygote twins. Experiments were carried out on 27 mares including 19 Polish pony and 8 heavy-type mares. Out of the total number of 134 collections, 55 (41%) embryos were obtained: on days 5.5-6.5 after ovulation, 12 embryos were collected; on day 7, the number was 32; and on day 8,...
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