Browsing by Author "Akkol, S."

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Comparison of Artificial Neural Network and Multiple Linear Regression for Prediction of Live Weight in Hair Goats
(Centenary University, 2017) Akkol, S.; Akilli, A.; Cemal, İ.
Artificial neural networks are artificial intelligence based methods which learns like humans, as humans did from instances. In recent years, artificial neural networks are often preferred in prediction studies of farm animals as like in many different fields as an alternative to regression analyses. In this study, based on measurements of morphologic traits of 475 Hair goats, the impact of different morphological measures on live weight has been modelled by artificial neural networks and multiple linear regression analyses. Comparison of these two models has been done. In the analyses done with the artificial neural networks method three different back propagation algorithms, such as Levenberg-Marquart, Bayesian regularization and Scaled conjugate, have been used. Methods performances have been determined with different criteria as coefficient of determination, mean absolute deviation, root mean square error and mean absolute percentage error. According to the analyses results, it’s noted that artificial neural networks method is more successful than multiple linear regression in prediction of body weight in hair goats. © 2017, Centenary University. All rights reserved.
GKD Tedavisinde Femoral Kısaltma ve/veya Derotasyon için Uygulanan Farklı Seviyelerdeki Femoral Osteotomi Radyolojik ve Klinik Sonuçları Nasıl Etkiler?
(Yuzuncu Yil Universitesi Tip Fakultesi, 2023) Türközü, T.; Akkol, S.
Introduction: In the present study, different femoral osteotomy levels applied in the combined surgical treatment of the patients aged over 2 years with developmental dysplasia of hip (DDH) were compared. It was aimed to determine the advantages and disadvantages of the osteotomies performed at the shaft and subtrochanteric regions of the femur and to evaluate the radiological and clinical impact on hip development. Materials and Method: The study included the patients aged over 2 years with DDH who were applied open reduction, Pemberton pericapsular osteotomy and femoral osteotomy (PPO). The demographic information, clinical evaluations and radiographic results of the patients were applied from the medical records. In addition, radiation exposure (the number of fluoroscopic images), operation duration and present of complications were evaluated. The patients were divided into two groups based on the level of femoral osteotomy as shaft (group 1) and subtrochanteric (group 2) groups. The Tönnis Classification System was used to assess the grade of preoperative hip dysplasia. Radiological evaluation was performed according to Severin’s criteria while modified McKay’s criteria was applied for clinical evaluation. Kalamachi and MacEwen’s criteria were preferred for evaluation of avascular necrosis (AVN). Results: 46 hips of 31 patients were included in the study. 21 hips were in the shaft group and 25 hips were in the subtrochanteric group. No statistically significant difference was present between the groups in terms of age, Tönnis type of hip, preoperative acetabular index, postoperative acetabular index, preoperative collo-diaphyseal angle, postoperative collo-diaphyseal angle and degree of derotation. The difference between the follow-up durations of the groups was statistically significant. The follow-up duration of the group 1 was shorter than the group 2. Although, clinical results in the group 1 were proportionally better than the group 2, no statistically significant difference was determined between the groups. A statistically significant difference was detected between the groups in terms of radiological results. AVN was found in none of the hips in the group 1 whereas 8 hips were detected with AVN in the group 2. The difference between the groups regarding femoral head AVN was statistically significant. There was a statistically significant difference between the groups in terms of operation duration and radiation exposure. Subluxation or redislocation developed in none of the cases. Conclusion: Femoral osteotomy performed for femoral shortening and/or derotation at the region of femoral shaft can be used as an alternative surgical procedure without increasing the risk for AVN in the pediatric patients aged over 2 years with DDH. © 2023, Yuzuncu Yil Universitesi Tip Fakultesi. All rights reserved.
Performance of Electronic and Visual Ear Tags in Lambs Under Extensive Conditions in Turkey
(Archiv Fur Tierzucht, 2015) Karakus, F.; Demir, A. O.; Akkol, S.; Duzgun, A.; Karakus, M.
The objective of this study was to evaluate the effectiveness of electronic and visual ear tags in animal traceability, and to investigate the effect of placement site on ear-tag retention in Akkaraman lambs under rural conditions. A total of 380 lambs were identified with electronic and visual ear tags. Electronic and visual ear tags displayed 98.9 and 98.7% readability at the end of 7 months, and 98.0 and 98.0% readability at the end of the first year after tagging, respectively. Regarding the placement site, it was observed that there was more loss in ear tags placed on the mid-point part of the ear than the first-quarter part from the head side, but the difference was not statistically significant (P > 0 : 05). Breakages and electronic failures were not recorded during this study. In conclusion, electronic and visual ear tags demonstrated similar on-farm efficiency for the identification of Akkaraman lambs and fulfilled the minimum efficiency of 98% required by the International Committee for Animal Recording (ICAR) for an official animal identification device at the end of the first year after tagging. Based on the findings of the study, placement of the ear tag in a cranial position and near the base of the ear would be advised.
Prediction of Inner Quality Characteristics of Eggs Using Partial Least Squares Regression
(Centenary University, 2018) Akyürek, S.; Akkol, S.
This study was carried out to obtain a prediction model for egg albumen and yolk weight, which are the internal quality characteristics of egg predicted from external quality characteristics of egg. For this purpose partial least squares regression method was applied to the data set used in the study and the results were compared with the principal component regression method. In the partial least squares regression analysis for egg albumen and yolk weight, the number of latent factor was 1 and the determination coefficients were 68.44% and 63.40%, respectively. For the egg albumen weight, the coefficients of determination for the principal component regression with one latent factor were 63.40% and 53.80%. When there is no restriction for the number of factors in the principal component regression, for the egg albumen weight the number of latent factors was five and the coefficients of determination was 79.77%; for the egg yolk weight the values were two and 75.35%, respectively. The results shown that the partial least squares regression method was more effective than the principal component regression method in dimension reduction, and more reliable predictions can be obtained in small sample sets with multicollinearity using the partial least squares regression method. © 2018, Centenary University. All rights reserved.
The Relationships Among Phenological Stages, Grain Yield and Some Yield Components, of Two-Rowed Barley Cultivars Under Van Ecological Conditions
(Centenary University, 2020) Yilkan, Y.; Öztürkci, Y.; Arpali, D.; Akkol, S.
This study was carried out in randomized block design with four replications in order to determine phenological periods, seed yield and some yield components of two-rowed barley varieties (Tarm-92, Ünver, Keser, Özdemir-05, Kalaycı-97, İnce-04 and Bolayır) in the 2017-2018 growing season under Van ecological conditions. In this study, the relationships among grain yield, other yield components and phenological periods were investigated by correlation and path analysis. In this study, vegetative period, grain filling time, germination ripening time, grain filling rate, fertile spike number per square meter, stalk length, spike length, grain number per spike, grain yield per spike, thousand grain weight and grain yield characteristics of the barley varieties were examined. According to the results of this study, it was concluded that grain yield was a function of vegetative period and grain filling period and it was determined that the effect of stem length on grain yield was positive and high. It has been concluded that vegetative term and grain load time is important selection criteria for growing wintery barley and due to the fact that it should be considered for breeding studies. © 2020, Centenary University. All rights reserved.