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Articles by Hasan Ulker
Total Records ( 4 ) for Hasan Ulker
  Ozdal Gokdal , Hasan Ulker , Ferda Karakus and Firat Cengiz
  In this study, the growth traits of Karakas and (Ile de France x Akkaraman (G1)) x Karakas crosses (F1) (IDFAK) lambs were investigated. Ewes in the flock were not milked and lambs were subjected to unlimited suckling regime without weaning. Least squares means of weights of IDFAK and Karakas lambs at birth and 1-6th months were 4.67 and 4.08 kg (p<0.01), 9.16 and 9.49 kg, 14.87 and 15.44 kg, 22.31 and 24.12 kg, 30.84 and 32.51 kg, 35.34 and 33.79 kg, 39.51 and 35.99 kg, respectively. Least squares means of daily live weight gains of IDFAK and Karakas lambs from birth to 1., 2., 3., 4., 5. and 6th months of age and between 3-6th months were 0.159 and 0.170 kg, 0.174 and 0.184 kg, 0.198 and 0.219 kg, 0.221 and 0.235 kg, 0.207 and 0.197 kg, 0.196 and 0.177 kg, 0.202 and 0.172 kg, respectively. The survival rates of IDFAK and Karakas lambs until 60th day were 95.94% and 89.79%, respectively (p<0.05). It seems that (Ile de France x Akkaraman (G1)) x Karakas crosses (F1) lambs reached to marketing age more short time than Karakas lambs. It could be concluded that Ile de France x Akkaraman (G1) genotype is useful in improving lamb production in Karakas sheep and desired growth could be obtained especially for cross lambs during 5th and 6th month age.
  Murat Demirel , Omer Faruk Kurbal , Turgut Aygun , Sibel Erdogan , Yunus Bakici , Ayhan Yilmaz and Hasan Ulker
  A total of 78 Norduz ewes and their lambs were used in the study. Group 1 (control) was grazed only on pasture and Group 2, 3 and 4 were supplied with 200, 300, 600 g-1 head day -1 rolled barley, respectively, in addition to pasture. There were increases in live weights in Norduz ewes in response to supplementary feeding during feeding period (P<0.01). Feed supplementation during mating period did not affect reproductive traits. The effect of ewe age on the twinning rate and litter size (P<0.01) and fecundity (P<0.05) was significant. The mean lamb birth weight, weaning weight, daily live weight gain and survivability at weaning were 4.65 kg, 19.29 kg, 192 g and 96.43%, respectively. In conclusion, supplementary feeding in addition to grazing during breeding season affected live weight in Norduz ewes but not other reproductive traits. Further detailed studies should be carried out in order to determine the effects of supplementary feeding on reproductive traits in this breed.
  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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