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Articles by Olcay Guler
Total Records ( 4 ) for Olcay Guler
  Olcay Guler , Mete Yanar , Recep Aydin , Bahri Bayram , Unsal Dogru and Sinan Kopuzlu
  The research was performed to determine the effect of non-genetic factors on milkability characteristics and to estimate genetic parameters and relationships among Milk Flow Rate (MFR), Milking Time (MT) and milk yields of Holstein Friesian cows reared in Eastern Region of Turkey. The data used in this study consisted of 1267 observations of MT and MFR on 177 lactations of 91 Holstein Friesian cows. The least squares means for MFR, MT and Total Test Day Milk Yield (TTDMY) were 1.049 kg min-1, 5.83 min and 12.31 kg, respectively. Parity, stage of lactation and calving season affected (p<0.01) on the MFR, MT and TTDMY. Multiparous cows had higher MT and TTDMY (p<0.01) than primiparous cows. Calving season affected (p<0.01) on MT, MFR and TTDMY. The heritability coefficients for MFR, MT and TTDMY were 0.21, 0.23 and 0.23, respectively. The positive genetic correlations of MFR with TTDMY, actual milk yield and 305 days milk yield were 0.62, 0.49 and 0.48, respectively, while genetic correlations between MT and TTDMY, actual milk yield and 305 days milk yield were 0.20, 0.28, 0.34, respectively. Phenotypic and genetic correlations between MFR and MT were -0.49 and -0.63, respectively.
  Olcay Guler , Mete Yanar , Bahri Bayram and Jale Metin
  The effects of three levels of milk replacer on growth performance of Brown Swiss calves (15 males and 15 females) were investigated in the study. The amount of daily milk replacer given to calves in the treatment groups was kept constant at 6, 7 and 8% of their birth weight. The calves were weaned at 35 days of age. The weaning weight, 4 and 6 months weights were, respectively 42.0±1.2, 93.5±4.3 and 142.0±6.3 kg for calves in 6% group, 42.6±1.2, 96.4±4.2 and 146.8±6.3 kg for those in 7% group and 45.4±1.2, 89.6±4.2 and 133.9±6.3 kg for young animals in 8% group. The weights were not significantly affected by the levels of the milk replacer. Levels of the milk replacer feeding did not affected significantly on the daily weight gains and gains in the body measurements in the pre- and post-weaning periods of the growth. Overall results of the study suggested that it could be possible to drop the level of milk replacer from 8 to 6% of birth weight without causing a detrimental influence on the growth characteristics of Brown Swiss calves.
  Abdulkadir Ozluturk , Olcay Guler , Mete Yanar , Omer Akbulut , Necdet Unlu , Sinan Kopuzlu and Ozmen Biberoglu
  The effects of two different initial ages of fattening on the weight gain, feed intake and feed efficiency characteristics as well as carcass and non-carcass components of the native Eastern Anatolian Red cattle raised in Eastern region of Turkey were studied in this research. According to the age at the beginning of the fattening, 61 EAR male cattle was allocated into two age treatment groups named as group I (9-14 months of ages) and group II (17-22 months of ages). Total weight gain throughout the fattening was numerically greater in younger group compared with the elderly group, however, the difference was not statistically significant. Total dry alfalfa hay and concentrate intake as dry matter did not differ significantly between age groups. However, feed efficiency ratios were significantly (p<0.01) influenced by initial age of the fattening in favour of younger EAR cattle. Carcass cutability and yield grade values of the EAR cattle in group I did not differ significantly from those in group II. Overall results of the study revealed that as initial age of the fattening lowers, fattening performance and feed efficiency ratio of EAR male cattle improved, but, carcass quality traits were not adversely influenced.
  Recep Aydin , Mete Yanar , Olcay Guler , Sadrettin Yuksel , Feyzi Ugur and Leyla Turgut
  The study was carried out to determine the effect of environmental factors on milkability traits and to estimate genetic parameters and relationships among milk yields, milk flow rate (MFR) and milking time (MT) of Brown Swiss cows reared in Eastern Region of Turkey. The data used in this study consisted of 2051 observations of milking time and milking flow rate on 315 lactations of 163 cows. The averages for MFR, MT and total test day milk yield (TTDMY) were 0.972 kg min 1, 5.46 min and 11.35 kg, respectively. Stage of lactation and parity had significant (p<0.01) effect on the MFR, MT and TTDMY. Multiparous cows had higher MT and TTDMY (p<0.01) than primiparous cows. Calving season only significantly (p<0.01) affected on TTDMY. The heritability estimates for MFR, MT and TTDMY were 0.37, 0.37 and 0.21, respectively. The positive genetic correlations of MFR with actual milk yield, 305 days milk yield, TTDMY were 0.423, 0.585 and 0.735, respectively, while negative genetic correlations between MT and milk yield traits were calculated. The higher heritability values for MFR and MT suggested that selection of a good milkability seems to be promising and genetic improvement in MFR and MT might be achieved through selection for milk production.
 
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