Yazar "Coyan, K." seçeneğine göre listele

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  • Küçük Resim Yok
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    The effect of presynchronization on reproductive parameters in ewes at the breeding season
    (WILEY-BLACKWELL, 2011) Kirbas, M.; Bulbul, B.; Coyan, K.; Kose, M.; Bekci, A.; Umutlu, S.; Ataman, M.
    [Abstract not Available]
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    Effects of curcumin and dithioerythritol on frozen-thawed bovine semen
    (WILEY, 2012) Bucak, M. N.; Başpınar, Nuri; Tuncer, P. B.; Coyan, K.; Sarıozkan, S.; Akalın, Pınar Peker; Büyükleblebici, S.
    The aim of this study was to determine the effects of curcumin and dithioerythritol added into bull semen extender on sperm parameters, lipid peroxidation, total glutathione and antioxidant potential levels of bull spermatozoa following the freeze/thawing process. Twenty-seven ejaculates obtained from three bulls were included in the study. Each ejaculate that was splitted into five equal groups and diluted in a Tris-based extender containing curcumin (0.5 and 2 mm), dithioerythritol (0.5 and 2 mm) and no additive (control) was cooled to 5 degrees C and frozen in 0.25-ml French straws. The extender supplemented with 0.5 mm dose of curcumin led to lower percentage of total abnormality (20.40 +/- 2.36%) when compared to the control (30.60 +/- 1.47%, P < 0.05). Curcumin and dithioerythritol at 0.5 mm provided a greater protective effect in the membrane functional integrity (54.40 +/- 2.09% and 50.00 +/- 2.68%), in comparison with control (37.20 +/- 1.77%, P < 0.001). Supplementation with antioxidants did not significantly affect the lipid peroxidation and antioxidant potential levels, while the maintenance of total glutathione levels in curcumin 0.5 mm was demonstrated to be higher than that of control, following the freeze/thawing (P < 0.05). Supplementation with these antioxidants prior to the cryopreservation process may be recommended to facilitate the enhancement of sperm cryopreservation techniques.
  • Küçük Resim Yok
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    Effects of ultrasonication on damaged spermatozoa and mitochondrial activity rate in Merino ram
    (WILEY-BLACKWELL, 2015) Akalın, Pınar Peker; Coyan, K.; Bucak, M. N.; Güngör, U.; Öztürk, C.
    [Abstract not Available]
  • Küçük Resim Yok
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    Effects of ysteine and ergothioneine on thawed merino ram sperm and biochemical parameters
    (WILEY-BLACKWELL, 2011) Coyan, K.; Başpınar, Nuri; Bucak, M. Numan; Akalın, Pınar Peker
    [Abstract not Available]
  • Küçük Resim Yok
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    Estrus synchronization using short- and long-term proestagen treatments and ram effect and ram effect plus flushing in ewes outside the breeding season
    (WILEY-BLACKWELL, 2011) Bülbül, Bülent; Kırbaş, Mesut; Ataman, Mehmet Bozkurt; Coyan, K.; Akbulut, Kerem; Köse, M.; Halıcı, I.
    [Abstract not Available]
  • Küçük Resim Yok
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    Synchronization of estrus with short- and long-term progestagen treatments and the use of GnRH prior to short-term progestagen treatment in ewes
    (ELSEVIER, 2009) Karaca, F.; Ataman, M. B.; Coyan, K.
    The objective of the present study was to determine the efficacy of the synchronization of estrus using short- and long-term progestagen treatments in ewes at the onset of the breeding season, and to evaluate the effect of the exogenous GnRH administration immediately prior to short-term progestagen treatment on the reproductive performance. A total of 240 Tahirova cross-bred ewes, aged 18-24 months, and 40 rams, aged 2-4 years-old, were used in the trial. Ewes were divided equally into 3 groups (n=80 per group). Intravaginal progestagen sponges containing FGA (30 mg) were inserted in the ewes for 7 d in the FGA1 (short-term) and GnRH treatment groups, and for 12d in the FGA2 group (long-term). The ewes in the GnRH group received 10.5 mu g busereline acetate i.m. at the time of sponge insertion. Tiaprost tromethamol (PGF(2 alpha),; 0.294 mg) and eCG (400 IU) were injected i.m. on the 6th day of progestagen treatment in the GnRH and FGA1 groups, and on the 11 th day in the FGA2 group following sponge insertion. All ewes were hand-mated once at the detection of estrus. The estrous response, fertility rate, multiple birth rate and litter size recorded was 88.7, 87.3,51.6% and 1.6 in the FGA1 group, 92.5, 71.6, 50.9% and 1.5 in the FGA2 group, and 96.2, 89.6, 71.0% and 1.8 in the GnRH group, respectively. No significant difference in estrous response between the groups was recorded, but the fertility rate in the FGA1 and GnRH groups was significantly (P<0.05) higher than in the FGA2 group. The occurrence of multiple births and litter sizes were significantly (P<0.05) higher in the GnRH group, compared to both the FGA1 and FGA2 groups, with the number of single lambs being significantly (P<0.05) higher in the FGA1 (48.4%) and FGA2 (49.0%) groups than in the GnRH (29.0%) group. However, the differences recorded between any of the groups in terms of the number of twin and triplet lambs were insignificant. In conclusion, it can be said that estrous synchronization using the 12-d-FGA-eCG-PGF(2 alpha) regimen could be replaced with the 7-d-FGA-eCG-PGF(2 alpha) regime in sheep at the onset of the breeding season. However, the combination of GnRH with the latter regimen (7-d-GnRH-FGA-eCG-PGF(2 alpha)) increased the multiple birth rate and litter size in the ewes. (C) 2008 Elsevier B.V. All rights reserved.