| dc.description.abstract | In recent years, increased costs pushes the sheep breeders. As for Kangal sheep breeders, they completely given
up milk and wool production. Because they build their only income on lamb reproduction, they are trying to
existence in this tough environment. The material of the study consisted of 160 multiparous (multiple-lambing)
sheep and 16 rams used in mating, which conceived out of season (mated in spring), gave birth in SeptemberOctober, and suckled their lambs for about 60-75 days. Animals in group 1 (n:60) were given 1st Prostaglandin
F2 α (PGF2α) injection on day 0, and Equine chorionic gonadotropin (eCG 500 IU) was injected simultaneously
with 2nd PGF2α (263 µg Cloprostenol sodium) on day 9th. Animals in group 2 (n:55) were given simultaneous
injections of PGF2α and eCG (500 IU) on day 0, and a second injection of PGF2α was administered on day 7.
Animals in group 3 (n:37) were injected with a double dose of PGF2α every 9 days. The efficacy of these
applications on reproductive parameters such as oestrus, conception, multiple conception, embryonic death,
number of births, number of offspring and fertility were evaluated. The difference between different
synchronization methods on estrus, pregnancy, embryonic death, birth and number of offspring was not
statistically significant (p >0.05). Multiple pregnancies in Group 2 were statistically higher than Group 3
(P=0.048). Considering the number of lambs per birth (productivity) in the groups, it was found as 1.3333, 1.5278
and 1.1667 in Group1, Group 2 and Group 3, respectively. In the statistical evaluation, the productivity of Group
2 was found to be significantly higher than Group 3 (P = 0.03). In the light of these results, it was determined
that by reducing the double dose PGF2α application interval to 7 days with standard 9-day intervals in the Kangal
breed, multiple pregnancy and lamb productivity per pregnancy could be increased with the combination of eCG
in the first application. It was concluded that this application may be a synchronization method that will increase
reproductive efficiency in the breeding season | tr |
