Published in Scientific Papers. Series D. Animal Science, Vol. LXVII, Issue 2
Written by Radena NENOVA, Yordanka ILIEVA, Ivan FASULKOV, Manol KARADAEV, Nasko VASILEV, Pencho PENCHEV
In buffaloes, synchronization is especially important because of the peculiarities of reproduction. Gestation was diagnosed sonographically 45 days after timed AI (TAI) in 133 buffalo cows and 75 heifers hormonally treated. The dispersion analyses included the factors-classes: protocol - PreSynch/OvSynch, OvSynch, OvSynch+PRID; clinical signs of estrus (CSE) - without CSE, sole patency of cervix, mucous discharge; age – heifers, cows; season - in and out of season. The results show that protocol has strongest effect on conception rates (CR) (P≤ 0.01), significantly lowest being that under PreSynch/OvSynch - 23.9%, compared to OvSynch (40.7%) and OvSynch+PRID (47.4%). In the heifers OvSynch+PRID and OvSynch show markedly higher results (50.0 and 52.9%), while in the buffalo cows with OvSynch CR is relatively low (38.3%). CSE is also significant (P≤ 0.05), the highest CR in the cases with mucus. The superiority of OvSynch+PRID finds expression in the highest incidence of full estrus (mucus) in the lactating buffaloes (70%) and especially in the heifers (82%). Especially OvSynch+PRID can be used for overcoming seasonal anestrus.
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