Person: ÜSTÜNER, HAKAN
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ÜSTÜNER
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HAKAN
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Publication Association of the caprine calpastatin Msp polymorphism with growth and reproduction traits in Saanen goats(Hellenic Veterinary Medical Soc, 2021-07-01) Ardıçlı, Sena; Üstüner, Hakan; Arslan, Oğuzhan; ARDIÇLI, SENA; ÜSTÜNER, HAKAN; ARSLAN, OĞUZHAN; Veteriner Fakültesi; Genetik Ana Bilim Dalı; 0000-0003-2758-5945; 0000-0002-1439-8502; O-3394-2019; GRY-9670-2022; JHO-8192-2023This study was designed to evaluate the effects of calpastatin (CAST) Mspl polymorphism on some growth and reproduction traits, including birth weight, first breeding weight, litter size, and average daily weight gain in Saanen goats. In this sense, blood samples obtained from 73 purebred female Saanen goats were used for genotyping. Genomic DNA was isolated by the phenol-chloroform method and used to determine CAST genotypes, including MM, MN, and NN, by means of the PCR-RFLP method. The population genetic parameters were estimated based on allelic distribution and the data were statistically analysed using analysis of variance (ANOVA) using a general linear model (GLM). Results revealed that N allele frequency was remarkably high (0.64) and the MM genotype was not present. The frequency of the heterozygous genotype was 59.62%. Concerning ANOVA results, significant differences were found between genotypes of the CAST locus concerning birth weight (P<0.05). In this respect, animals with the NN genotype were associated with higher birth weight means (2.85 +/- 0.29 kg) compared to heterozygous animals (2.53 +/- 0.24 kg). There was no significant association between the CAST marker and any of the remaining phenotypic traits evaluated. The present results suggest that focusing on this genomic region may be particularly useful in improving birth weight in goats which can be considered as an early indicator of post-weaning animal growth and survival.Publication The combined effect of melatonin implant and removal of buck seminal plasma on cryopreservation during the nonbreeding season(Mary Ann Liebert, Inc, 2022-09-20) Gökçe, Elif; Önder, N. Tekin; ÜSTÜNER, BURCU; ÜSTÜNER, HAKAN; Üstüner, Hakan; Yılmaz, M. Melih; Hüraydın, Oğuzhan; Toker, M. Berk; TOKER, MEHMED BERK; Veteriner Fakültesi; Üreme ve Suni Tohumlama Ana Bilim Dalı; 0000-0002-7678-3289; 0000-0001-6050-791X; A-2794-2014; GWC-2055-2022; AHB-0614-2022This study aimed to determine how melatonin (MT) and seminal plasma affected the freezability of buck sperm during the nonbreeding season. Semen was collected from eight bucks before (pre-MT) and after (post-MT) MT application in the nonbreeding season. Individual ejaculates were collected from the bucks, split into two equal groups according to the removal of seminal plasma (SP) (-) or nonremoval of SP (+). For washing, the groups of ejaculates were centrifuged, and the supernatant was separated, SP (-) and SP (+) ejaculates were diluted, then frozen. Semen samples were examined for sperm motility, plasma membrane integrity, defective acrosomes, DNA fragmentation, and mitochondrial membrane function at the native and post-thaw stages. When the general average post-thaw motility (p < 0.01), plasma membrane (p < 0.05), acrosome (p < 0.05), and DNA integrity rates (p < 0.05) and mitochondrial membrane potential (MMP) (p < 0.01) were evaluated, it was seen that MT administration caused a statistically significant improvement. The dramatic effect of nonremoval of seminal plasma on motility and plasma membrane integrity is more clearly observed in individual semen samples frozen in the pre-MT group (p < 0.05). Also, it was observed that removing seminal plasma in the post-MT group caused even milder post-thaw acrosome damage compared with the SP (+) group (p < 0.05). The effect of removing seminal plasma was not observed in terms of DNA integrity and MMP rates in pre- and post-MT groups. As a result, it was concluded that MT application and removal of seminal plasma in the nonbreeding season result in improvement in the freezability of buck semen.Publication Fattening performance and carcass traits of imported simmental bulls at different initial fattening age(Sivar-soc Italiana Veterinari Animali Reddito, 2020-08-01) Ustuner, Hakan; ÜSTÜNER, HAKAN; Ardicli, Sena; ARDIÇLI, SENA; Arslan, Oznur; Brav, Fahir Cankat; Veteriner Fakültesi; 0000-0003-2758-5945; O-3394-2019; AAG-9127-2021Fattening performance is one of the most important traits in cattle breeding. These traits are closely associated with adequate initial weights and slaughter endpoints. In this context, the aim of this study was to investigate optimum initial fattening age of imported Simmental young bulls and to provide a detailed analysis of initial fattening age effects on fattening performance and carcass characteristics. Seventy five animals were purchased from a single commercial farm where they had been reared under identical production conditions and were allocated into four groups according to age and live-weight as follows: Group I (4 months of age), Group II (6 months of age), Group III (8 months of age), and Group IV (10 months of age). All animals were housed in semi-open pens and were fed ad libitum with the same appropriate diet for 12 months. The animals were slaughtered in a commercial abattoir according to standard routines and carcass traits including hot and chilled carcass weights, dressing percentage, and chiling loss were determined. Morever, performance traits including total weight gain, feed conversion rate, average daily weight gain, and dry matter intake were estimated. Results revealed that the initial fattening age of bulls showed significant effects on total weight gain and chilled carcass dressing. In this context, Group I was characterized by the highest total weight gain, whereas, Group IV had the highest values for chilled carcass dressing. During early fattening periods, first three periods, average daily weight gain was significantly different among the treatments. This study pointed out that, concerning importation, younger Simmentals with the initial fattening age of four months may be more suitable and profitable for medium-term fattening. The present results may have a potential to influence adequate management practices in Simmental farms, and moreover, the recent strategies for importation of cattle.Publication Growth, fattening performance, and carcass characteristics of Saanen, Turkish Hair x Saanen, and Honamli x Saanen crossbred kids(TÜBİTAK, 2020-10-01) Akbaş, Aykut Asım; Elmaz, Özkan; Sarı, Mehmet; Üstüner, Hakan; Kuleasan, Şukran; Saatcı, Mustafa; ÜSTÜNER, HAKAN; Veteriner Fakültesi; Hayvan Bilimi Ana Bilim Dalı; 0000-0002-4341-5842; AAG-9127-2021The study was carried out to investigate the possibilities of obtaining slaughtered kids using indigenous breeds in Saanen flocks, which does not require breeding. The birth weights were 3.22 kg, 3.05 kg, and 3.18 kg for the Saanen, Turkish Hair x Saanen (F-1), and Honamli x Saanen (F-1) crossbred kids, respectively. The mean live weight values of the same genotypes at the end of fattening (146th day) were determined as 25.96 kg, 27.11 kg, and 29.57 kg for the male kids, respectively. The cold carcass weights and dressing percentage (%) of the same genotypes were determined to be 10.95 kg, 12.40 kg, and 13.21 kg and 43.59%, 44.43%, and 44.48%, respectively for the male kids. M. Longissimus dorsi (MLD) cross-sectional areas were 9.42 cm(2), 9.94 cm(2), and 11.44 cm(2) for the genotypes among the examined factors, which was statistically significant (P < 0.05). It might be thought that the study was important as it was among the first studies on the use of different genotypes as a sire line on the Saanen goats. The study also focused on a rarely tried pattern of commercial crossbreeding and kid production in a time when the Saanen farms do not need to breed kids. This attempt was a new concept for Saanen rearing.Publication Türkiye’de ruminant sağlığı alanında çalışan veteriner hekimlerin hayvancılık ve ekonomik durumları ile ilgili değerlendirmeleri-II(Bursa Uludağ Üniversitesi, 2024-03-26) Batmaz, Hasan; Topal, Onur; Üstüner, Hakan; BATMAZ, HASAN; TOPAL, ONUR; ÜSTÜNER, HAKANBu anket çalışması ile Türkiye’de ruminant sağlığı alanında çalışan veteriner hekimlerin ülkemiz hayvancılığı ve ekonomik durumları ile ilgili değerlendirmelerinin ortaya konması amaçlanmıştır. Elektronik posta ile gönderilen ankete yedi farklı coğrafi bölgedeki 56 ilden toplam 326 veteriner hekim katılmıştır. Kendilerine bu alanla ilgili 19 soru sorulmuştur. Çalışma sonuçları genel olarak değerlendirildikten sonra veriler; veteriner hekimlerin çalışma şekline göre 3 grup, yaşlarına göre 4 grup ve coğrafi bölgelerine göre 3 grupta ele alınmıştır. Sığırcılıkla ilgili en önemli sorunlar; sırasıyla yem fiyatları, yetiştiricinin kar edememesi, üretici süt-et fiyatlarının düşüklüğü, mera sorunu, kırsal bölgeden göç, hastalıklara bağlı kayıplar ve kuraklık olmuştur. Koyun-keçi yetiştiriciliğinde en önemli sorunlar; sırasıyla mera, yem fiyatları, kuraklık, yetiştiricinin kar edememesi, üretici süt-et fiyatlarının düşüklüğü ve hastalıklardır. Veteriner hekimlerin %83,13’ü bölgelerindeki hayvan sayısının azaldığını ve %60,68’i ise 6-30 sığır kapasitesinde olan işletme grubundan azaldığını belirtmiştir. Meslektaşların %56,31’i hayvancılığın sürdürülebilir karlı olma olasılığının %25’in altında ve %20,92’si hiç karlı olmayacağı görüşündedir. Veteriner hekimlere gelir düzeylerinin geçmiş yıllara göre değişimi sorulduğunda %58,77’si olumsuz ve %29,23’ü kısmen olumsuz olarak değerlendirmiştir. Gelecek 10-20 yıldaki ruminant hekimliği hakkında %49,39’u olumsuz ve %33,44’ü kısmen olumsuz düşünmektedirler. Meslektaşlarımızın %63,80’i kendi çocuklarının veteriner hekim olmasını istememektedir. Önümüzdeki 10 yıl içerisinde gelişme potansiyeli en yüksek alanlar sorulduğunda pet sektörü %41,01, biyoteknoloji %17,03, sürü sağlığı %15,77, organik tarım ve hayvancılık %15,46, halk sağlığı %7,26, hayvan refahı %3,47 olarak yanıtlanmıştır. Sonuç olarak; veteriner hekimler ruminant hayvancılığının küçüldüğünü ve ruminant hekimliğinin daralacağı görüşündedirler.