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Articles by Mehmet Koyuncu
Total Records ( 7 ) for Mehmet Koyuncu
  Mehmet Koyuncu , Huseyin Yerlikaya and Seniz Ozis Altincekic
  The aim of the present study was to evaluate the effect of different doses dexamethasone and progestagen-PMSG on fertility and prolificacy in Kivircik ewes during the breeding season. For the experiment, 100 ewes were divided into four groups, with 25 females in each group. Groups were fluorgestone acetate (FGA, 30 mg), administered via intravaginal sponges. Experimental groups 2, 3 and 4 mL dexamethasone injection were given 72 h before mating season. The fertility rates control, 2, 3 and 4 mL were 88.0, 92.0, 100.0 and 100.0%, respectively (p<0.05). The prolificacy rates for the same groups were 122.7, 130.4, 144.0 and 156.0%, respectively (p<0.01). The injections dexamethasone significantly increased lamb birth weight and daily weight gain for 60 days (p<0.05).
  Mehmet Koyuncu
  The aim of the study was to determine the effects of accelerated lambing scheme of three lambing in two years. Ewes were bred at 8 month intervals; July (J), March (M) and November (N). Lambing rates for J, M and N were found 89.6, 90.5 and 92.2%, respectively. Litter size at birth in J (1.56) and M (1.54) differed (p<0.01) with respect to N (1.31). Lamb survival at weaning in J (94.7%) was higher (p<0.05) than M (90.4%) and N (91.3%). Weaning rate was affected (p<0.01) by breeding date; N-ewes had fever lambs weaned than J and M-ewes. In general, both prolificacy and weaning rate were consistently higher (p<0.05) as ewe`s age increased. This accelerated lambing scheme generated a ewe productivity, on an annual basis, of 1.33±0.07 lambing, a litter size of 1.77±0.22 at birth and 1.66±0.21 at weaning. Considering the July values as those representing an annual breeding, the accelerated lambing scheme increased lamb production 15% at birth and 19% at weaning. The results indicated that Kivircik ewes have a good potential for production systems requiring improved prolificacy or accelerated lambing management.
  Fatma Sezer Senol , Gulderen Yilmaz , Bilge Sener , Mehmet Koyuncu and Ilkay Orhan
  The ethyl acetate and methanol extracts prepared from the fruits, aerial parts, and roots of Heptaptera anatolica (Boiss.) Tutin, (Umbelliferae), H. anisoptera (DC.) Tutin, H. cilicica (Boiss. & Balansa) Tutin (endemic), and H. triquetra (Vent.) Tutin were tested for their acetylcholinesterase (AChE) inhibitory and antioxidant activities. AChE inhibition was evaluated using ELISA microplate reader at 500, 1000, and 2000 μg mL−1. Antioxidant activity was determined by 2,2-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging test and Fe+2-ferrozine test system for metal chelating power at the same concentrations. Total phenol contents of the extracts were determined using Folin-Ciocalteu reagent. At 2000 μg mL−1, only the aerial parts and fruits of H. anatolica showed moderate anti-AChE effect (61.97% and 49.80%, respectively), while the aerial parts and fruits of H. triquetra had the highest DPPH scavenging effect (80.48% and 86.19%, respectively). All of the methanol extracts exhibited significant ferrous ion-chelating effect varying between 72.97% and 92.36%, whereas only four of the ethyl acetate extracts exerted chelating effect over 70%. These results indicate that Heptaptera species could be a good source for antioxidant compounds.
  Ismail EKER , Mehmet KOYUNCU and Hasan AKAN

This study was carried out between 2001 and 2004 to determine the geophytic flora of Sanliurfa, located within C6, C7, and C8 of the grid system in Turkey. In all, 789 plant specimens that consisted of 104 taxa belonging to 13 families and 30 genera were gathered from the investigation area. Of all the collected specimens, 19 taxa were new records for C6, C7, and C8, and 11 taxa were endemic to Turkey.

Scilla mesopotamica Speta, which was first collected from Sanliurfa-Halfeti in 1888 by Sintenis and was considered a missing species, was rediscovered after 116 years during this study. Colchicum crocifolium Boiss. was also determined as a new record for Turkey.

According to floristic regions, Irano-Turanian elements ranked first among the specimens, accounting for 47.12%, followed by Mediterranean elements (25.00%) and Euro-Siberian elements (0.96%). Some of the identified species (26.92%) were widespread and of unknown phytogeographic origin. In addition, 86.54% of the collected taxa were determined to be monocotyledons and the remaining (13.46%) were dicotyledons.

The families with the most taxa in the research area were Liliaceae (59) and Iridaceae (14). Concerning the number of species, the major genera in this region were as follows: Allium L. (17), Ornithogalum L. (10), Gagea Salisb. (9), Bellevalia Lapeyr. (6), and Iris L. (6). Moreover, of all collected taxa, 57.69% were bulbous, 21.15% were tuberous, 17.31% were cormous, and 3.85% were rhizomous. Concerning flowering time, 93.27% of the taxa bloomed in early-spring and spring, while 6.73% bloomed in autumn.

  Mehmet KOYUNCU
  Vinca soneri Koyuncu sp. nova (Apocynaceae) is described and illustrated as a new species from eastern Anatolia in Turkey. Diagnostic morphological characters of this new species from the related species V. herbacea Waldst. & Kit. are discussed.
  Mehmet KOYUNCU and Serdar DURU
  The aim of the present study was to estimate (co) variance components for birth weights of Karacabey Merino lambs. The model fitted included direct genetic, maternal genetic, and direct-maternal genetic covariance and maternal permanent environmental effects. Data and pedigree information of the Karacabey Merino sheep used in this study were collected at the Marmara Animal Breeding Research Institute from 1998 to 2002. Variance components for birth weights were estimated by the MTDFREML. A direct heritability estimate of 0.08 and a maternal heritability estimate of 0.05 were obtained for birth weight. The maternal permanent environmental effect was significant. The estimate of the direct-maternal genetic correlation was found high and negative. In conclusion, maternal effects on birth weight of Karacabey Merino lambs were significant and need to be considered in any selection program undertaken in this breed.
  Abdulkadir ORMAN , Aytekin GUNAY , Faruk BALCI and Mehmet KOYUNCU
  In this study, a total of 28 Saanen does were used to evaluate the relationship between somatic cell count (SCC) and milk yield. The study included 14 first-lactation (primiparous) does and 14 does in second lactation or greater (multiparous). Individual milk samples from both morning and evening milkings were taken every 15 days throughout the lactation period of 7 months. While somatic cell counts were higher during the evening milking (840.40 versus 532.30 cells mL−1; 1050.40 versus 759.70 cells mL−1), milk yields were lower during the evening milking (115.40 versus 193.80 kg; 177.40 versus 280.00 kg) for both primiparous and multiparous goats. Parity of the does affected the variables significantly, except for days in milk. Primiparous does had lower milk yields and SCCs than multiparous does. Overall, the mean SCC, logarithmic SCC, days in milk, and milk yield were 686.40 x 106 cells mL−1 and 905.10 x 106 cells mL−1 (P < 0.05), 5.81 and 5.94 (P < 0.05), 203.33 and 207.58 days (P > 0.05), and 309.20 and 457.40 kg (P < 0.05) per doe per lactation, for primiparous and multiparous goats, respectively. Goat milk samples contained high SCCs and exceeded the requirement of 1 x 106 mL−1 of the Pasteurized Milk Ordinance (PMO) during most of the late lactation stages; however, the overall SCC mean was under the PMO limit. The SCC was negatively correlated with milk yield, but the correlation coefficient was not found to be significant (P > 0.05). As lactation progressed, the SCC increased and milk production decreased in primiparous and multiparous goats. The results of this paper could be useful for the development of acceptable goat milk SCC standards in Turkey.
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