Ömer Şengül

Dr. Ömer Şengül

orcid

Research Focus & Metrics

Academic Career Length

9Years (2018-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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10 December 2018 in TURKISH JOURNAL OF VETERINARY AND ANIMAL SCIENCES
Verified
Journal Article
Open access
ESEkin SUCU
Ekin SUCU
KAKadir Cem Akbay
Kadir Cem Akbay
ÖŞÖmer Şengül
Ömer Şengül
MYMerve Tuba Yavuz
Merve Tuba Yavuz
IAİbRahim Ak
İbRahim Ak

21 May 2025 in Archives Animal Breeding
Verified
Journal Article
Open access
PDF file
ÖŞÖmer Şengül
Ömer Şengül
ŞÇŞenol Çelik
Şenol Çelik
This study was carried out to determine the final weight estimation of Kıvırcık lambs using body measurements via Chi-square automatic interaction detection (CHAID), exhaustive CHAID, classification and regression tree (CART), random forest (RF), multivariate adaptive regression spline (MARS), and bootstrap-aggregating multivariate adaptive regression spline (Bagging MARS) algorithms. For this purpose, height at withers (HW), back height (BH), croup height (CH), chest depth (CD), body length (BL), chest width (CW), and chest circumference (CC) were measured in the lambs. The statistical performances of these algorithms (CHAID, exhaustive CHAID, CART, RF, MARS, and Bagging MARS) were tested by using several goodness-of-fit criteria, namely the coefficient of determination (R2=0.699, 0.699, 0.722, 0.662, 0.792, and 0.624), adjusted coefficient of determination (Adj.R2=0.633, 0.633, 0.721, 0.637, 0.768, and 0.609), coefficient of variation (CV % = 6.35 and 5.14, P<0.01), mean square error (MSE = 3.296, 3.296, 2.904, 4.461, 2.277, and 4.121), root mean square error (RMSE = 1.815, 1.815, 1.704, 2.112, 1.509, and 2.030), mean absolute error (MAE = 1.409, 1.409, 1.279, 1.702, 1.193, and 1.628), and mean absolute percentage error (MAPE = 3.925, 3.925, 3.578, 4.002, 3.335, and 3.967), between actual and predicted values of live body weight. With this, the best-fitted MARS model was chosen using cross-validation and user-defined parameter optimization. As a result, it has been shown that it is possible to make a successful estimation of the live weights of lambs by using some of the morphological features of the lambs.

28 June 2020 in Bilecik Şeyh Edebali Üniversitesi Fen Bilimleri Dergisi
Verified
Journal Article
Closed access
PDF file
ÖŞÖmer Şengül
Ömer Şengül
MŞMusa Şeremet
Musa Şeremet
Menderes KAMMenderes KAM
Menderes KAM
Günümüzde, çevreye duyarlı üretim yöntemleri çerçevesinde ve doğal kaynakların ve enerjinin verimli kullanması, iklim değişikliğine sebep olan salınımların azaltmak için yeni ürünlere ihtiyaç duyulmuştur. Plastik malzemeler günlük hayatımızda önemli yer tutmaktadır. Termoplastik polimer malzemelerden olan polipropilen (PP), otomotiv sanayisi, tekstil ve yiyecek paketlemesi gibi çok geniş kullanım alanlarına sahiptir fakat bazı durumlarda istenilen özellikleri verememektedir. Bu malzemelerin özelliklerini daha iyileştirmek için kompozit malzemeye ihtiyaç duyulmaktadır. Sürekli gelişim ve değişim içinde olan kompozit malzemeler; maliyetlerin düşürülmesi, ürünün verimliliğinin ve kalitesinin arttırılması gibi birçok avantajlara sahiptir. Plastik malzemelere katkı olarak kullanılan bazı malzemeler plastik kompozit olarak mekanik ve termal özelliklerinde de iyileşmeler meydana getirmektedir. Bu çalışmada, % 1 grafit maddesi ile yaygın olarak kullanılan polipropilen (PP) malzeme ile çift vidalı ekstrüder tezgahında homojen karışımı yapılarak, enjeksiyon makinesinde 100 adet standart test çubuğu üretimi yapılmıştır. Katkısız polipropilen (PP) ile prototipi yapılan ürün ve kompozit ürünün izod darbe testi, eriyik akış endeksi (MFI), ısı deformasyon testi (HDT), sertlik testi (Shore-D), çekme testi ve yoğunluk testleri yapılmıştır. Test sonuçlarına göre, katkısız polipropilen (PP) ve Grafit katkılı polipropilen (GPP) kompozit malzemenin bazı termal ve mekanik özelliklerindeki değişmeler incelenmiştir. Sonuç olarak, bu iki malzemenin mekanik özellikleri yaklaşık olarak % 30 üzerinde ve termal özelliklerinde de yaklaşık % 15 üzerinde iyileşme meydana gelmiştir. Mekanik ve termal özelliklerinin iyileştirilmesi ile plastik sektöründe büyük avantajlar sağlayacaktır. Ayrıca, savunma sanayisi, havacılık ve otomotiv sektöründe yeni ürün olarak kullanılabileceği öngörülmüştür.

20 May 2019 in Turkish Journal of Agriculture - Food Science and Technology
Verified
Journal Article
Open access
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AŞAhmet Yusuf Şengül
Ahmet Yusuf Şengül
ÖŞÖmer Şengül
Ömer Şengül
ADAYDIN DAS
AYDIN DAS
Particularly in the fruit juice industry, the remaining peels and pulp parts are not available for human consumption after the juices are used. It is possible to evaluate these wastes by adding them to poultry feeds. A number of studies have been conducted by researchers on the nutritional value of many fruit wastes and on the performance of poultry. Natural antioxidant content has been reported to have a positive effect on growth, microbial and immunological parameters when high fruit peels are used as feed additive in poultry feeding.

17 January 2024 in Journal of the Hellenic Veterinary Medical Society
Verified
Journal Article
Open access
PDF file
ÖŞÖmer Şengül
Ömer Şengül
IAİ Ak
İ Ak
This study was carried out to investigate the effects on carcass characteristics of lambs fed with different silage types (corn silage, sunflower silage and their mixtures) and their mixtures at different levels. In the study, rumen volatile fatty acids levels and rumen pH of the lambs used in the experiment were determined at the beginning and end of fattening. For corn silage and sunflower silages, aerobic stability and lactic acid bacteria and yeast-mold counts were determined. In the treatment, 40 Kıvırcık male lambs aged 2.5-3 months were used as animal material. Lambs were divided into 5 different silage groups (100% corn silage, 75% corn+25% sunflower silage, 50% corn silage+50% sunflower silage, 25% corn silage+75% sunflower silage, 100% sunflower silage) and it was planned to have 8 lambs in each group. The lambs were housed in individual compartments during the experiment and the animals were individually fed. Silages were given to the lambs ad libitum and in addition to silage 700, 900 and 1400 g concentrated feed were given daily between 0-21, 21-42 and 42-56 days, respectively. As a result, it can be said that feeding with different silage types does not have a significant effect on carcass characteristics of lambs, and silages prepared with corn silage, sunflower silage and their mixtures can be used successfully in lamb fattening.

25 September 2019 in Atatürk Üniversitesi Ziraat Fakültesi Dergisi
Verified
Journal Article
Closed access
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YŞYusuf Şengül
Yusuf Şengül
HIHakan İnci̇
Hakan İnci̇
ÖŞÖmer Şengül
Ömer Şengül