Browsing by Author "Demir, Murat Can"

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Effect of Oestrus Synchronization With Different Lengths of Progesterone-Impregnated Sponges and Equine Chorionic Gonadotropin on Reproductive Efficiency in Romanov Ewes During the Non-Breeding Season
(veterinarni A Farmaceuticka Univerzita Brno, 2022) Kuru, Mushap; Kuru, Buket Boga; Kacar, Cihan; Demir, Murat Can; Cetin, Nebi
This study aimed to determine the effects of different lengths of progesterone and equine chorionic gonadotropin (eCG) treatment on reproductive performance during the non-breeding season in ewes. Progesterone-impregnated sponges were inserted intravaginally for 7 d in Group 1 (G1, n = 24), 9 d in Group 2 (G2, n = 25), and 11 d in Group 3 (G3, n = 24). On the day of sponge removal, eCG (350 IU) was injected and 24 h later the ewes were exposed to rams. Pregnancy was diagnosed by transrectal ultrasonography 30 ?? 3 d after mating. Oestrus symptoms of G2 and G3 started earlier than G1, but there was only a significant difference between G1 and G3 (P = 0.013). In G1, G2, and G3, the oestrus responses were 100%, 100%, and 95.8%, pregnancy rates were 79.2%, 72%, and 75%, lambing rates were 79.8%, 72%, and 75%, litter sizes were 2.5, 2.2, and 2.4, and multiple birth rates were 86.7%, 80%, and 85.7%, respectively (P > 0.05). In conclusion, the short-term progesterone-impregnated sponge and eCG treatment provided excellent oestrus induction. The effects of different days (7, 9, or 11) of progesterone treatment on reproductive indicators were similar; therefore, the stress caused by the inserted sponge can be reduced by short-term use.
Effect of Two Prostaglandin F2α Injections Administered 24 Hours Apart on the Pregnancy Rate of Simmental Cows Subjected To the Ovsynch or Ovsynch Plus Controlled Internal Drug Release (Cidr) Protocols
(Polish Soc veterinary Sciences Editorial office, 2020) Kuru, Mushap; Kacar, Cihan; Oral, Hasan; Kaya, Semra; Cetin, Nebi; Kaya, Duygu; Demir, Murat Can
The aim of the present study was to determine the effects of one or two doses of prostaglandin F2 alpha (PGF) on the pregnancy rate (PR) in Simmental cows subjected to the Ovsynch or Ovsynch + Controlled internal drug release (CIDR) protocols. On d 0, 100 mu g gonadorelin diacetate tetrahydrate (GnRH) was injected into cows in group 1 (n = 50) and group 2 (n = 40) and CIDR was intravaginally inserted. On d 7, 25 mg dinoprost tromethamine (PGF2 alpha, PGF) was administered, and GnRH was injected 56 h later. Fixed-time artificial insemination (TAI) was performed 16 h after GnRH injection. In group 3 (n = 62) and group 4 (n = 63), PGF was administered 7 d following Gn RH treatment, and GnRH was injected 56 h later. TAI was performed 16 h after Gn RH injection. In groups 2 and 4, a second dose of PGF was injected 24 h after the first dose. Pregnancy was determined by transrectal ultrasonography on d 30 and 60 post-TAI. The pregnancy rate (PR) on d 30 post-TAI was significantly different among the groups: 46%, 55%, 29%, and 36.5%, in groups 1, 2, 3, and 4, respectively (P = 0.048). In addition, the PR was 36.3% and 43.7% in the single PGF and double PGF injection groups, respectively. There was no statistical difference in the PR on d 60 post-TAI (P > 0.05). Pregnancy loss was between 4.34% and 11.11% (P > 0.05). The highest PR in the prim iparous cows was observed in group 3 (57.7%). The PR was not significantly different among multiparous cows (P> 0.05). In conclusion, two injections of PGF administered 24 h apart in Simmental cows may increase the PR in the Ovsynch or Ovsynch + CIDR protocols.