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Articles by Galip Bakir
Total Records ( 5 ) for Galip Bakir
  Galip Bakir , Ali Kaygisiz and Suleyman Cilek
  In this study, effects of environmental factors on milk yield and milk yield characteristics of Holstein cows raised at Tahirova state farm in Balikesir province of Turkey have been investigated. A total of 1302 milk records obtained between 2000 and 2007 were used in this study. As milk yield traits, lactation duration, lactation milk yield, 305 days milk yield and dry period were investigated. Effect of environmental factors on milk yield traits was analyzed by using the least square means method. The least square means for the lactation duration, lactation milk yield, 305 days milk and dry period yield were 331.74±1.55 days, 7574.39±55.22 kg, 6810.14±56.38 kg and 79.47±0.90 days, respectively. The effects of calving year on lactation duration, lactation milk yield, 305 days milk yield and dry period were much significant (p<0.01). Effect of calving season on lactation duration was significant (p<0.05). Effect calving age on lactation duration and lactation milk yield was significant (p<0.05, p<0.01). The effects parity on lactation duration, lactation milk yield, 305 days milk yield and dry period were significant (p<0.01-0.05). It can be said that Holstein cattle have quite well milk yield and are raised successfully on Tahirova state farm and under conditions of west Anatolia in Turkey. To obtain much higher milk yield in this farm, true selection for milk yield should be done and better feeding, care and management should be done.
  Galip Bakir and Suleyman Cilek
  The aim of this study was to investigate environmental factors affecting reproductive traits of Holstein cows and heifers raised at the Tahirova state farm in province Balikesir in Turkey. Reproductive traits were investigated by using 1074 records between 2000 and 2008. The least square means of age of first breeding, age of first calving, service period, calving interval and gestation length were 523.90±6.71, 815.38±7.18, 387.69±1.60, 122.30±1.67 and 277.45±0.27 days, respectively. Effects of calving year, calving age, calving season on age of first breeding and age of first calving were statistically significant (p<0.01). The effects of calving age, calving year and calving season on calving interval were significant (p<0.01-0.05). Although, the effect of calving year on service period was non-significant (p>0.05), the effects of calving age and calving season on service period were significant (p<0.01-0.05). Effects of sex of calf, calving age, calving year and calving season on gestation length were statistically significant (p<0.01-0.05). According to these results, it can be concluded that reproductive performance of Holstein cattle reared at this farm in Balikesir province were raised more successful than state farms in other regions of Turkey. To obtain better reproductive performance, service period should be decreased, heifers should be bred at 15 months of age, oestrus detection and artificial insemination should be done at the right time and convenient manner, GnRH injections was done for cows with high milk yield.
  Galip Bakir , Siddik Keskin and Hamit Mirtagioglu
  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.
  Galip Bakir , Ali Kaygisiz and Hasan Ulker
  The purpose of this study is to estimate genetic parameters of milk yield traits in Holstein and Brown Swiss cattle raised at two different State Farms. The heritability estimates of 305 days milk yield and lactation length were 0.21±0.06 and 0.06±0.04 for Holstein Friesian; 0.37±0.03 and 0.27±0.03 for Brown Swiss, respectively. The repeatability estimates of 305-days milk yield and lactation length were 0.36±0.03 and 0.22±0.03 for Holstein Friesian; 0.54±0.16 and 0.65±0.12 for Brown Swiss, respectively. It has been estimated that heritability of milk yield traits were moderate, repeatability of lactation length was high. Thus, high repeatability estimates are promising for opportunities for early selection practices.
  Galip Bakir , Ali Kaygisiz and Hasan Ulker
  The purpose of this study was to estimate genetic and phenotypic parameters for birth weight in Holstein calves raised at 4 different state farms. The least squares mean of birth weight was 38.09±0.07 kg. Effects of birth year, birth type, parity, farm (P<0.01) and season (P<0.05) on birth weight was significant; however, the effect of sex on birth weight was not significant. Repeatability and heritability estimates for birth weight were 0.34±0.02 (P<0.05) and 0.13±0.02 (P<0.01). Based on these results it can be suggested that the effects of environmental factors should be eliminated in the selection which will be mediated based on birth weight.
 
 
 
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