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The article presents the results of a study of the efficiency of transcervical embryo transplantation obtained from donor- cows in vivo. The aim of the experiment was to compare the effectiveness of ipsilateral transfers randomized laterally from the uterine horn of embryos of different stages of development (blastocysts and morulas). The embryos were located in the left or right horn of the uterus of recipient heifers (n = 283 cows). It was experimentally established that the functional asymmetry of the ovaries of the recipients affects the level of survival of preimplantation embryos. Thus, in case of transfer to the left horn of the uterus of the recipients blastocysts 60.91% of pregnant heifers were found; morulas - 45.45%. In case of similar procedures in the right horn of the uterus - were found respectively 58.78% and 14.29% pregnant. The obtained results indicate the need for further scientific research to study the structural and physiological features that affect the survival rate of pre-implantation embryos. Key words: donor cows, recipient heifers, embryo transfer, blastocysts, morulas, transferable embryos, ipsilateral localization. References Anderson, G. B. (1983). Embryo transfer in domestic animals. Adv.Vet. Sci, 27, 129-162. Bollman, M., Greenhawk, A., Shipley, A., & Gibbons, P. (2020). Ovarian profile and pregnancy rates following ovulation synchronization and timed-artificial insemination in dairy cows. College of Veterinary Medicine. Lincoln M.U., 1291-1300. Buhrov, O. D., & Tkachova, I. V. (2013). Znachennia metodu transplantatsii embrioniv u systemi selektsiinoi roboty z maloplodnymy vydamy tvaryn. Nauk.–tekhn. Biul, 113, 43-52 (in Ukrainian). Danchuk, O. V., Karposvkii, V. I., Tomchuk, V. A. et al. (2020). Temperament in Cattle: A Method of Evaluation and Main Characteristics. Neurophysiology, 52, 73–79. https://doi.org/10.1007/s11062-020-09853-6 Does, C., Stringfellow, D., & Shultz, P. D (1984). Incorporation of follicle stimulating hormone used for embryotransfer in cattle into maltilamellar lyposomes. Theriogenology, 21(4), 661-675. https://doi.org/10.1016/0093-691X(84)90450-3 Dovhopol, V. F., Duvanov, O. V., & Ivanchenko, M. I. (2010). Efektyvnist biotekhnolohii transplantatsii embrioniv velykoi rohatoi khudoby u Poltavskii oblasti. Veterynarna medytsyna, 13, 138-141 (in Ukrainian). Duvanov, O. V. (2011). Morfolohichna kharakterystyka zhovtykh til yaiechnykiv i efektyvnist stymuliatsii poliovuliatsii koriv-donoriv. Rozvedennia i henetyka tvaryn: mizh vid. temat.nauk.zb. – K.: Ahrarna nauka, 45, 63-67 (in Ukrainian). FAO. 2010a. |
