Incidence of early embryonic death in dairy cows
2005
Vasilev, N. (Trakia University, Stara Zagora (Bulgaria)) | Jotov, S. (Trakia University, Stara Zagora (Bulgaria)) | Dimitrov, F. (Trakia University, Stara Zagora (Bulgaria))
Transrectal ultrasound examination for evaluation of pregnancy in the early period of gestation was used. We equally sought to improve the production in stock breeding farms by reducing the internal between inseminations and the service period. Our study was carried out on 63 Black-and-White heifers with native oestrus and artificial insemination (first group), 184 Black-and-White cows after native oestrus and artificial insemination (second group) and third group - 78 Black-and-White cows with synchronized oestrus and ovulation. Pregnancy was tested on the 28th, 35th, 45th and 60th day after the insemination with ultrasound equipment Aloka; and 5 MHz linear probe. Early embryonic death was established in 9.09% of the animals from the first group, 19.02% of the second group and 20.75% of animals from the third group for the whole research period. The highest proportions of early embryonic death were registered between days 28 and 45 - 16.20% and 18.87% in the second and the third groups, respectively.
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