Published in Scientific Papers. Series D. Animal Science, Vol. LXIII, Issue 2
Written by Nikola METODIEV
The aim of the present study was to study the reproductive response at Ile de France ewes after 5 days progestagen treatment plus or without pregnant mare serum gonadotropin (PMSG). The experiment was carrired out with 26 multiparous ewes. Three experimental groups were formed depending on whether a PMSG was used or not, as well as the time of treatment with a synthetic analogue of PGF 2α (before or after the removal of sponges). Group 1 (PGF /Pg/PMSG) (n=8) - at the time of the placement of the sponges, the ewes were treated with a synthetic analogue of PGF 2α. At the time of the sponge removal, 300 UI PMSG was put i.m. Group 2 (PGF /Pg) (n=9) - at the time of the placement of the sponges, the ewes were treated with a synthetic analogue of PGF 2α. Group 3 – (Pg/ PGF) (n=9) - the ewes were treated with a synthetic analogue of PGF 2α at the time of the sponge removal. The protocol, that consisted PMSG, successfully synchronized estrus (100%) with high levels of fertility (87.5%) and fecundity (171.4%). Protocols, which were without PMSG, were not suitable for ES, because of unsatisfactory results, that were obtained.
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