Browsing by Author "Ucar, Omer"

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Effects of Oestrus Synchronisation Using Melatonin and Norgestomet Implants Followed by Ecg Injection Upon Reproductive Traits of Fat-Tailed Morkaraman Ewes During Suckling, Anoestrus Season
(Elsevier, 2012) Uslu, Baris Atalay; Tasal, Ibrahim; Gulyuz, Fetih; Sendag, Sait; Ucar, Omer; Goericke-Pesch, Sandra; Wehrend, Axel
The aim of this study was to compare the efficacy of different oestrus synchronisation protocols using melatonin (MEL), norgestomet (NOR) and melatonin + norgestomet (MELNOR) treatments (further, all animals from the groups MEL, NOR and MELNOR were supplemented with equine chorionic gonadotropin, eCG) in fat-tailed Morkaraman ewes during the non-breeding season. Forty healthy suckling ewes were assigned, from mid-May onwards, randomly to one of four experimental groups. Ten ewes were assigned to the control group CON (n = 10) and received no treatments. Ten ewes were assigned to the MEL group (n = 10) receiving a subcutaneous melatonin ear implant for 35 days, followed by a 500 IU intramuscular (i.m.) injection of eCG. Ten ewes were assigned to the NOR group (n = 10) and received norgestomet implants placed subcutaneously in the ear for 10 days and followed by a 500 IU i.m. injections of eCG after removal of the implant. The last 10 ewes were assigned to the MELNOR group (n = 10) receiving a subcutaneous melatonin ear implant for 35 days plus a subcutaneous norgestomet ear implant, inserted on the 25th day of the melatonin implant, for 10 days. It was then followed by a 500 IU i.m. injection of eCG after removal of the norgestomet implant and by introduction of rams to the flock concurrently. Ewes exhibiting oestrous signs by 7 days were hand-mated with rams known to be fertile. Blood samples were collected at the time of first implantation (baseline), on day 35 (norgestomet implant removal and eCG injection) and when ewes expressed oestrus in order to determine plasma progesterone (P-4) concentrations. The values of oestrus response, onset of oestrus post-treatment, pregnancy/lambing rates and litter sizes were recorded. The results showed that the oestrus rates were identical for all synchronisation protocols (100%) and the oestrus rates (40 +/- 16.3%) were significantly lower (P < 0.001) in the control group. The onset of oestrus shortened slightly in the hormone-treated groups. The P-4 concentrations on the day of eCG injections (at the end of synchronisation) were significantly higher (P < 0.01) in the hormone-treated groups (varying from 2.45 to 2.91 ng/ml) compared to the control group (0.45 ng/ml). Pregnancy/lambing rates were slightly higher in the synchronised groups (varied from 60 to 80%), compared to the control group. The results of oestrus synchronisation with melatonin and norgestomet ear implants (supplemented with the eCG) showed that: (i) an oestrus onset could be shortened significantly (P < 0.001) with melatonin and/or norgestomet, and (ii) significantly higher (P > 0.01) P-4 concentrations and higher lambing rates could be obtained in all hormone-treated ewes when compared to the un-treated Morkaraman ewes during the suckling (anoestrus) season. (C) 2012 Elsevier B.V. All rights reserved.
Is There a Relationship Between Serum Minerals (Ca, Mg) and Trace Elements (Cu, Fe, Mn, Zn) at Mating on Pregnancy Rates in Fat-Tailed Morkaraman Sheep
(Agricultural Research Communication Centre, 2017) Uslu, Baris Atalay; Mis, Leyla; Gulyuz, Fetih; Comba, Bahat; Ucar, Omer; Tasal, Ibrahim; Wehrend, Axel
The specific roles of nutrients in reproduction are not well defined in sheep. Hence, the relationships between certain mineral (Ca, Mg) and element (Cu, Fe, Mn, Zn) levels at mating and pregnancy rates was investigated in fat-tailed Morkaraman ewes synchronised with different hormones (melatonin, norgestomet implant and eCG) early in anoestrus season. For this purpose, 40 healthy ewes (aged 2-4 years) allocated in the synchronised (n=30) and no-treated group (n=10) were used during mid-May (suckling period). On the eCG injection day, fertile rams (n=8) were introduced into the groups and, then the oestrus signs were visually monitored twice daily for 7 days. The oestrous ewes were allowed to hand-mate using rotational (four rams daily) mating system. Additionally, jugular blood samples were collected on the days of onset of oestrus (before mating) for determination of serum Ca, Cu, Fe, Mg, Mn and Zn levels. Presence of pregnancies was diagnosed by real-time ultrasonography 35 days post-mating. Totally, 25 ewes became pregnant (21 ewes with stimulated-and 4 with spontaneous oestrus), while 9 ewes (all received stimulation) were not pregnant. In non-pregnant ewes, unlike other minerals and elements, the Cu and Zn values were significantly lower than their reference values (for Cu: 0.87 +/- 10.16 mg/dl vs. 9.20 mg/dl; for Zn: 2.06 +/- 10.30 mu g/dl vs. 3.8 mu g/dl, resp.; P<0.01 in both cases). In pregnant ewes, the corresponding values remained unchanged (P>0.05). Hence, the present findings indicate that the low Cu and Zn levels during the oestrus might adversely affect the subsequent pregnancy rate in suckling ewes.
Short-Acting Deslorelin Implant (Ovuplant®) Could Not Sufficiently Induce Fertile Cycles of Coloured Mohair Goats in Suckling (Anoestrous) Season
(Kafkas Univ, veteriner Fakultesi dergisi, 2012) Uslu, Baris Atalay; Sendag, Sait; Tasal, Ibrahim; Gulyuz, Fetih; Ucar, Omer; Wehrend, Axel
It is known that the pituitary FSH and LH stores are dramatically depleted during the anoestrous in seasonal breeders. Hence, the aim of this study was to evaluate the effect of deslorelin implant (a GnRH analogue) to induce oestrus in suckling goats. Suckling goats (n=21) of coloured Mohair breed were randomly assigned into two trial groups: Goats in Group I (n=11, Ovuplant (R)) received subcutaneously the implant (2.1 mg deslorelin), while animals in Group II (n=10, control) received no treatment. Along with the implant administration, serum progesterone (P-4) concentrations were determined (every other day up to 12 d) by RIA method. Within 4 days of implant administration, there were significantly higher (P<0.001) rates (100%) of pro-oestrus signs (attractiveness without mating) in Group I, than those in controls (zero %). The signs sustained for 9 days without oestrus (mating) in the vast majority (10/11) of implant-treated animals. But, an exceptional goat was in receptive oestrus commenced from the third day following the onset of pro-oestrus. Even so, there was no pregnancy post-mating. The P-4 concentrations between the groups remained below 1 ng/ml, regardless of implant treatment. Findings suggest that; i) for the P-4 concentrations, there was no marked difference between implant-treated and control groups, as remaining below 1 ng/ml all, and ii) short-acting deslorelin implant could not induce fertile oestrus cycles in coloured Mohair goats during the suckling (anoestrous) season.