Browsing by Author "Mirtagioglu, H."

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Classification Tree for Low Birth Weight Rate of Calves
(2009) Mirtagioglu, H.; Keskin, S.; Bakir, G.
The aim of study was to determine effects and interactions of age of first insemination, first calving age, calving age, calving interval, lactation order, dry period, calving month and sex of calf variables on low birth weight rate in calves by using of Classification tree (CT) method. For this the observations obtained from 596 animal materials were used. As a result, calving interval, calving age and calving month were found as significant predictor variables for low birth weight rate of female calves. On the other hand, none of these (calving interval, calving age and calving month) variables was found as significant for male calves.
Determination of the Effective Factors for 305 Days Milk Yield by Regression Tree (Rt) Method
(2010) Bakir, G.; Keskin, S.; Mirtagioglu, H.
The purpose of this study was to determine the effects of dry period, lactation parity, farm, calving season and age on 305 days milk yield using Regression Tree (RT) method. For this purpose 3315 data of 735 Holstein-Friesian raised in Ceylanpinar, Reyhanli and Tahirova State Farms were analyzed. Dry period-lactation parity and farm-calving season and calving age were determined to affect 305 days milk yield at the first, second and third degree factors, respectively. The 305 days milk yield was affected by dry period, calving age and season and being of the dry period around ideal period (60 days) affected milk yield positively. It was suggested that dry period should be around 60 days and some precautions to decrease the adverse effects of heat on milk yield are required to be taken. © Medwell Journals, 2010.
Effect of Stocking Density on Deviation From Bilateral Symmetry and Slaughter Weight in Broilers
(Pakistan Agricultural Scientists Forum, 2013) Mirtagioglu, H.; Mollaogullari, A.; Genc, S.; Mendes, M.
The main objective of this study was to investigate the effect of two different stocking densities (11 birds / m(2) and 17 birds / m(2)) on deviation from bilateral symmetry in broiler chickens. For this purpose, the weekly body weight, left and right shank length, shank width, wing length, face width and face length of the same birds were measured on from 7th to 42nd days of age. Repeated measurements analysis of variance was used to investigate the effect of stocking densities and ages (week) on relative asymmetry. Binary logistic regression analysis was used to determine the most important morphological character influencing the deviation from ideal slaughter weight of 1800 g. The overall relative asymmetry mean for shank width was significantly greater in control group (2.42 +/- 0.41) than in treatment group (1.87 +/- 0.43). The results of binary logistic regression analysis showed that only increase in difference of width in left and right shank caused significant change (p= 0.0148) in slaughter weight. In this study, the deviation from the bilateral symmetry was mostly found in fluctuating asymmetry for the measured characters in treatment group (11 birds per m(2)), and the low fluctuating asymmetry level was generally indicated higher welfare level and lower developmental instability for this group than that of the control group (17 birds per m(2)). Stocking density can be stated as one of the most important environmental factors which may influence developmental stability, welfare and performance of broilers.
Influence of Using Alternative Means on Type-I Error Rate in the Comparison of Independent Groups
(Pakistan Agricultural Scientists Forum, 2014) Mirtagioglu, H.; Yigit, S.; Mollaogullari, A.; Genc, S.; Mendes, M.
In this study, the effect of using trimmed, winsorized, and modified means instead of arithmetic mean on type-I error rate was investigated when the assumptions of the one-way ANOVA were not satisfied. Therefore, random numbers were generated by simulation technique from the populations distributed by Normal (0,1), Beta (5,2) and chi(2) (3) for 3 and 4 groups. The results of 30 000 simulation trials demonstrated that all the means displayed similar type-I error rates when the variances were homogenous regardless of the distribution shape, sample size and the number of groups. When homogeneity of variances assumption was not satisfied, the most reliable result was obtained by using trimmed mean in terms of keeping the type-I error rate at nominal alpha level and it was followed by modified and winsorized means. The most biased results were obtained when arithmetic mean was used.
Regression Tree Analysis for 305 Day Milk Yield in Holstein Cows
(indian veterinary Journal, 2008) Mirtagioglu, H.; Keskin, S.; Bakir, G.
305 - day milk yield in cows is one of the most important traits in breeding studies. Therefore, it is important to determine and investigate the relationships between the 305-days milk yield and other related traits. In the present study, relationships between 305-day milk yield and related traits as well as their interactions were analyzed by using regression tree analysis (RT).