Browsing by Author "Yilmaz, A."

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The Application of Overdispersion and Generalized Estimating Equations in Repeated Categorical Data Related To the Sexual Behaviour Traits of Farm Animals
(Asian Network for Scientific Information, 2007) Yeşilova, A.; Yilmaz, A.
In this study, the Poison regression, negative binomial regression and generalized estimating equations were applied to the repeated measurements based on count data obtained from the sexual behaviors of ram lambs. Negative binomial regression was more effective to handle the over dispersion that causes bias in parameter estimations in Poison regression. The generalized estimating equations were used for analyzing repeated categorical data. GEE estimates were obtained by using the exchangeable working correlation. As a result of GEE analyses, it was concluded that flehmen lip curl response, tail raising, mount duration, vocalization and weight of the ram lamb were statistically important (p<0.05) for mount frequent. However, the anogenital sniff found be not significant. © 2007 Asian Network for Scientific Information.
Changes in Testicular Development, Ultrasonographic and Histological Appearance of the Testis in Buck Kids Immunized Against Lhrh Using Recombinant Lhrh Fusion Protein
(Wiley-blackwell Publishing, inc, 2009) Ulker, H.; Kucuk, M.; Yilmaz, A.; Yoruk, M.; Arslan, L.; deAvila, D. M.; Reeves, J. J.
This study was designed to evaluate the effectiveness of recombinant Ovalbumin-LHRL (OL) immunization on changes in testicular size, histological appearance and testosterone production in buck kids. Thirty native buck kids at 18 weeks of age were divided into three groups, control (n = 10), immunization (n = 10) and castration (n = 10) groups. Immunized animals received OL protein generated by recombinant DNA technology. Ultrasonographic and histological examinations of the testes were performed. Animals were slaughtered at 44 weeks of age. Semen and epididymides were evaluated for the presence of sperm cells. Immunized animals generated anti-LHRH antibodies. Testosterone production, testicular and accessory glands development and sperm production were suppressed in the immunized animals (p < 0.01). Semineferous tubule diameters decreased (p < 0.01), basal membrane of the tubule was thickened and hyalinized in immunized kids. Immunization affected ultrasonographic appearance of the testes drastically. While testes of control animals gained their normal ultrasonographic appearance as the age increased, immunized animals had uniform hypoechogenic testicular structure as observed at 18 weeks of age until slaughter. Simultaneous histological and ultrasonographic evaluations indicated that the changes in testicular histology could partly be monitored via ultrasonographic imaging; nevertheless, it is difficult to claim that ultrasonographic image reflects the exact changes in such instances. In conclusion, these results indicate that recombinant OL fusion protein is effective in immunocastration in buck kids and has a potential to be used as an alternative to physical castration. Further researches should be conducted to help assessing reproductive status of testes from ultrasound images.
Comparing Covariance Structures Using Different Optimization Techniques in Glmm on Some Sexual Behaviors of Male Lambs
(Pakistan Agricultural Scientists Forum, 2013) Ser, G.; Yesilova, A.; Yilmaz, A.
This study is concerned with use of generalized linear mixed models (GLMM) to analyse the repeated measurements based on count data obtained from the sexual behaviors of male lambs. A combination of different optimization techniques and covariance structures were applied to four constructed models. These models were defined in terms of random effect specifications. Therefore, residuals was assumed to be random (Model A), intercept assumed to be random effect (Model B), time (slope) assumed to be random effect (Model C) and both intercept and time assumed to be random effects (Model D). Five different techniques quasi-newton (QUANEW), newton-raphson (NEWRAP), trust region (TRUREG), newton-raphson ridge (NRRIDG) and double-dogleg (DBLDOG) optimization techniques were used for analyzing these models. Three different covariance structures compound symmetry (CS), unstructured (UN) and first-order autoregressive (AR(1)) were used. In conclusion, based on likelihood criteria, the Model A with CS structure outperformed other models for the repeated measurement data of sexual behavior characteristics.
Delayed Diagnosis of Selective Immunoglobulin Deficiency: a Case Report
(Ondokuz Mayis Universitesi, 2016) Kars, V.; Celepkolu, T.; Yilmaz, A.; Esmer, F.; Karadas, S.
Selective immunoglobulin A deficiency (SIgAD) is the most common of all primary immunodeficiency diseases; however, the pathogenesis has not been fully understood. Although most people with SIgAD are asymptomatic, some may present with recurrent infections; such as respiratory disorders, gastrointestinal tracts disorders, and allergic disorders. Herein, we report a case with SIgAD who presented with the complaints of pruritus, dental caries and chronic sinopulmonary infections. © 2016 OMU.
A Description of Growth Performances of Norduz Kids and Milk Yield of Norduz Goat
(National Centre for Agrarian Sciences, 2014) Bingol, M.; Daskiran, I.; Yilmaz, A.
In this research, growth performance of Norduz kids and milk yield of Norduz goats, a native gene resource in Turkey, were defined. The animals studied were brought from natural habitats to the animal research farm of Agricultural Faculty, Yuzuncu Yil University. Descriptive statistics for average birth, weaning, 30 th day, 60 th day, 90 th day, 120 th day, 150 th day and 180 th day weights of Norduz kids were found to be 2.98±0.07, 13.37± 0.44, 6.70±0.20, 10.88±0.34, 14.44±0.44, 17.92±0.48, 21.15±0.55, and 23.09±0.65 kg respectively. Least squares means of single kids and twin kids of Norduz were found to be 3.12±0.06 and 2.57±0.07 kg respectively. Least squares means of single male, single female, twin male and twin female kids of Norduz were found to be 3.23±0.08, 3.01±0.09, 2.81±0.09 and 2.33±0.10 kg respectively. Least squares means of lactation length and lactation milk yield were 226.4±7.23 day and 347.2 ± 40.06 kg respectively. Descriptive statistics of the growth of all kids revealed that in the time interval from birth to day 90 of age, birth to day 180 of age, birth to weaning (84 day) and weaning to day 180 of age daily weight gain were 0.193± 0.005, 0.145±0.004, 0.129±0.005 and 0.323± 0.043 kg, respectively. © 2014, National Centre for Agrarian Sciences. All rights reserved.
Effect of Frequent Ejaculation on Live Weight and Sperm Characteristics in Norduz Lambs
(Taylor & Francis Ltd, 2006) Bingol, M.; Yilmaz, A.; Cengiz, F.; Kum, D.
To determine the effects of frequent ejaculation on live weight and sperm characteristics, 12 Norduz rams (17 mo) were divided into three groups. The semen samples of the second and third group rams were collected 3 and 5 times per day, respectively, while no semen was collected from the first group. The sperm motility, semen viscosity and mass motility were marginally better in rams of third group (P < 0.05). In both groups semen volume decreased over the days and ejaculate number on the same day. Other parameters were either unaffected or did not follow any definite pattern. It is concluded that live weight of rams and semen characteristics were not affected by taking 3-5 ejaculates in a day in Norduz rams.
The Effects of Immunization Against Lhrh Using Recombinant Lhrh Fusion Protein Ol on Testicular Development, Ultrasonographic and Histological Appearance of the Testis in Buck Kids
(Amer Soc Animal Science, 2006) Ulker, H.; Kucuk, M.; Yilmaz, A.; Yoruk, M.; Arslan, L.; deAvila, D. M.; Reeves, J. J.
Lhrh Fusion Protein Immunization Alters Testicular Development, Ultrasonographic and Histological Appearance of Ram Testis
(Wiley-blackwell Publishing, inc, 2009) Ulker, H.; Yilmaz, A.; Karakus, F.; Yoruk, M.; Budag, C.; deAvila, D. M.; Reeves, J. J.
This study was designed to evaluate the effectiveness of a luteinizing hormone releasing hormone (LHRH) fusion protein immunization on reproductive traits in ram lambs including the changes in histology and ultrasonographic appearance of testis. Thirty native ram lambs at 19 weeks of age were divided into control (C, n = 10), immunization (I, n = 10) and castration (E, n = 10) groups. Animals in immunization group were immunized against LHRH using ovalbumin-LHRH-7 (OL) protein generated by recombinant DNA technology as a primary and a booster injection at 19 and 23 weeks of age respectively. Animals were bled via jugular venepuncture at 2-week intervals to determine LHRH antibody and testosterone concentrations. Bi-weekly ultrasonographic examination of the testes was performed to determine the changes in ultrasonographic appearance as the age increased. Biopsied testicular tissues taken at 19, 29 and 41 weeks age were also evaluated. At 41 weeks of age, animals were slaughtered. Semen and epididymis were evaluated for the presence of sperm cells. Testicular development and sperm production were suppressed in the immunized animals. Semineferous tubule diameters decreased, basal membrane of the tubule was thickened and hyalinized in immunized ram lambs. While testes of control animals gained their normal ultrasonographic appearance as the age increased, immunized animals had uniform hypoechogenic testicular structure as observed at 19 weeks of age until slaughter. Simultaneous histological and ultrasonographic evaluations indicated that the changes in testicular histology could partly be monitored via ultrasonographic imaging. Nevertheless, it is difficult to claim that ultrasonographic image reflects the exact changes in such instances. In conclusion, these results indicate that recombinant OL fusion protein is effective in immunocastration in ram lambs and has a potential to be used as an alternative to physical castration. Further research studies should be conducted to help assess reproductive status of testes from ultrasound images.
Noise Pollution, Psychiatric Symptoms and Quality of Life: Noise Problem in the East Region of Turkey
(Cambridge Univ Press, 2012) Akan, Z.; Yilmaz, A.; Ozdemir, O.; Selvi, Y.; Korpinar, M. A.
Oxidative Stress in Rats During Exposure To Cigarette Smoke and After Smoking Cessation
(Wiley-blackwell, 2016) Donder, A.; Balahoroglu, R.; Huyut, Z.; Yildirim, S.; Dulger, H.; Ilhan, F.; Yilmaz, A.
Phenotypic Correlations Among Fleece Traits in Norduz and Karakas Sheep
(2011) Kor, A.; Karakus, F.; Tuncer, S.; Yilmaz, A.; Bingol, M.; Cengiz, F.
In this research, it was aimed to determine the phenotypic correlations among some physical traits of Norduz and Karakas sheep. Animal material was consisted from 2-6 years of age of breeding flocks of 50 Norduz and 50 Karakas ewes. Traits measured were greasy fleece weight, fiber diameter, clean fleece percentage, staple length, single fiber actual length, single fiber natural length, breaking strength, elasticity and the number of crimp in 2.54 cm. There was a positive correlation between clean fleece percentage and fiber diameter, it was insignificant for both genotypes. The estimated phenotypic correlations between staple length and greasy fleece weight was 0.403 (p<0.01) and 0.445 (p<0.01) in Norduz and Karakas sheep, respectively. It was understood that traits like fiber diameter, length, fleece weight and the number of crimp should be evaluated together in breeding studies on fleece yield in Norduz and Karakas sheep. © Medwell Journals, 2011.
Production of Rosmarinic Acid Nanoparticles, and Investigation of Anti-Oxidation Effects on Salmon Fish Meat
(Turkish Chemical Society, 2022) Ceylan, Z.; Budama Kilinc, Y.; Yilmaz, A.; Unal, K.; Ozdemir, B.
In this study, an anti-oxidant nanoformulation to prevent the oxidation of salmon was developed using rosmarinic acid (RA). Minced salmon samples (MSs) were treated with 8.10-3 g (RAT1) and 16.10-3 g (RAT2) RA-loaded nanoparticles for 100 g MS rosmarinic acid, separately. The thiobarbituric acid (TBA) values of control (C), RAT1, and RAT2 samples stored at 4 °C were found as 2.995, 1.350, and 0.994 mg MDA/kg; respectively, after 9 days. While the initial free fatty acid (FFA) value of C samples was 2.011%, RAT1 and RAT2 were found as 2.765% and 2.494%, respectively. The 2,2,diphenylpicrylhydrazyl (DPPH) values of MSs treated with RAT1 and RAT2 were observed to be higher than that of C samples. C samples were evaluated as unfit for human consumption on the 5th day of the storage, it was revealed that but the sensory scores of MSs treated with RAT1 and RAT2 were still acceptable for human consumption. © 2022, Turkish Chemical Society. All rights reserved.