Browsing by Author "Cengiz, Firat"

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Comparison of Pure Caucasian, Carniolan and Native Anatolian Ecotype Honey Bee (Apis Mellifera L.) Colonies in the Eastern Anatolia Region With Reciprocal F1 Hybrids
(Univ Federal Uberlandia, 2024) Erkan, Cengiz; Gunbey, Veysel Serkan; Gunbey, Belgin; Cengiz, Firat
The aim of this study was to compare specific physiological and behavioral characteristics of A. m. caucasica, A. m. carnica, and native honeybees, as well as reciprocal crosses, within the ecological conditions of East Anatolia (Van province), Turkey. The findings revealed that native honeybees exhibited the highest average sealed brood area and the highest average number of frames with bees. In contrast, the highest average honey yield was observed in the crossbreeding of Carniolan bees with native bees. Significant differences were identified among the groups concerning brood area, the number of bee frames, aggression tendency, and honey yield. The study concluded that Carniolan and Caucasian bees exhibited suboptimal performance outside their native habitats. Nevertheless, Carniolan bees were identified as a viable option for mitigating aggression tendencies and enhancing honey yield in native bee populations.
Determination of Factors Influencing Birth Weight Using Regression Tree (Rt) Method
(Garuda Scientific Publications, 2008) Eyduran, Ecevit; Karakus, Kadir; Keskin, Siddik; Cengiz, Firat
This study was conducted to evaluate the effects of genotype, sex, birth type and year and dam age on birth weight by applying regression tree method using 101 Karakas and 103 Norduz lambs raised at Research and Application Farm of the Faculty of Agriculture, Yuzuncu Yil University, Van, Turkey. The effect of sex on single-lambs was significant, whereas, genotype had a significant effect on twin-lambs. The heaviest mean birth weight was obtained by single-male lambs, but twin-lambs born by dam of 2, 3 and 6 years age in the Norduz breed had the lowest mean birth weight.
Determination of the Best Growth Curve and Measurement Interval in Norduz Male Lambs
(Medwell online, 2008) Karakus, Kadir; Eyduran, Ecevit; Kum, Derya; Ozdemir, Tenar; Cengiz, Firat
The aim of this study, was to determine the best non-linear model and measure interval (biweekly or monthly) in explaining the body weight-age relationship in Norduz male lambs born in 2004. For this aim, Brody, Logistic, Gompertz and Richards non-linear models were fitted to the average body weight-age data with 15 (biweekly) days and 30 (monthly) days of measure intervals. Although, Logistic model become equal to Richards model (99.8%) for two intervals, Logistic model had lower RMSE than Richards model. Therefore, the best non-linear model for 2 intervals was Logistic model having the highest coefficient of determination (R-2) but the lowest Root of Means Square Error (RMSE). Contrary to Brody non-linear model, the usage of 30 days of measure intervals performed positive effect on Logistic, Gompertz and Richards non-linear models instead of 15 days of measure interval. As a result, it was concluded that the best non-linear model for Norduz male lambs was Logistic model and the appropriate measure interval for Norduz male lambs was monthly interval.
Evaluation of One-Shot Vaccination Protocol for Suppressing Reproductive Functions in Rams Using Encapsulated Ovalbumin-Lhrh Protein
(Agricultural Research Communication Centre, 2018) Yilmaz, Ayhan; Karakus, Ferda; Hakan, Bunyamin; Stormo, Keith; Cengiz, Firat; Ulker, Hasan
The objective of study were to determine the effectiveness of Ovalbumin-LHRH-7 (OL) protein administered with cytosine guanine (CpG) adjuvant and Incomplete Freund's Adjuvant (IFA), and used one-shot immunization (single-dose vaccination) protocol in which booster dose included in microspheres in rams. Fifty ram lambs at about a year old were used. Treatment groups receiving Ovalbumin LHRH and control contained 10 animals. They were stratified according to age (weeks), live weight and scrotal circumference size, and were randomly assigned to five groups. Scrotal circumference, sexual activities and the numbers of rams having sperm in the ejaculate were affected from treatment (P<0.05) depending on the dose and vaccination protocol. However, immunization did not affect live weight changes in any treatment groups (P>0.05). Findings clearly demonstrate that the effects of OL immunization on reproductive traits in yearling rams were prominent when it was administered at higher dose and classical one primary and one booster immunization as free protein form. Also we observed that the effect of higher and single dose of OL protein in encapsulated form on reproductive traits had the partial suppressing. CpG adjuvant along with IFA was proved to be an effective adjuvant and could be suggested to be used and alternative to FCA in hormone immunization.
Multilevel Analysis for Repeated Measures Data in Lambs
(Galenos Publ House, 2018) Akkol, Suna; Karakus, Ferda; Cengiz, Firat
The study was conducted to compare the individual growth curves models and to detect individual differences in the growth rate by a performing multilevel analysis. The data set used for this purpose consisted of live weight records of 52 crossbred lambs from birth to 182 days of age. There were 670 observations in level-1 units which were the repeated measurements over time, and there were 52 observations in level-2 units which were lambs. In the study, parameter estimation of time-independent covariate factors, such as gender, birth type and birth weight, was performed by using five different models within the framework of multilevel modeling. LRT, AIC and BIC were used for the selection of the best model. The "Conditional Quadratic Growth Model-B" provided the best fit to the data set. The multilevel analysis indicated that linear and quadratic growth in lambs was significant. According to the results of the study, individual growth curves can he investigated using multilevel modeling in animal studies which is an important parameter of the individual growth rate.