Effect of Timing of Frozen Semen Insemination on Pregnancy Rate in Mares |
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Authors: | Katila T Celebi M Koskinen E |
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Institution: | 114.Animal Reproduction, Faculty of Veterinary Medicine, University of Helsinki, Pohjoinen Pikatie 800, SF-04920, Saarentaus, Finland ;214.Equine Reproduction, Agricultural Research Centre, Jokioinen, Finland ; |
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Abstract: | Thirty-four mares were inseminated with frozen semen from one stallion during 2 oestrous cycles, every 48 h until ovulation took place and within 12 h after ovulation. Semen was frozen using the Colorado method. The insemination dose was from 200 to 400×106 progressively motile spermatozoa. Ovaries were examined every 12 h to determine time of ovulation. Examination for pregnancy was carried out using ultrasonography, 15 days after ovulation. Thirty-five per cent of mares inseminated < 24 h and 23% of mares inseminated between 24 - 48 h before ovulation were pregnant (p = 0.388). The pregnancy rate in all mares inseminated before ovulation was 30%. In the mares inseminated within 12 h of ovulation, it was 18% (p = 0.253). Younger mares (aged 4-10 yr) had a higher pregnancy rate (59%) than older mares (aged 11-15 yr) (23%), but the difference was not statistically significant (p = 0.057). |
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