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Articles by Ayhan CEYHAN
Total Records ( 2 ) for Ayhan CEYHAN
  Muhittin Ozder , Tamer Sezenler , Ahmet Refik and Ayhan Ceyhan
  Genetic and non-genetic influences on the body weights of 8429 Turkish Merino lambs sired by 292 rams over 1992-2006 were evaluated. Traits analyzed were Birth Weight (BW), 3 Months Weight (3 MW), 6 Months Weight (6 MW), 12 Months Weight (12 MW), Pre-weaning Daily Gain (PRDG) and Post-weaning Daily Gain (PSDG). REML estimates of variance and covariance components were obtained by using animal models in which the fixed effects of year of lambing, sex, birth type and age of dam and random animal direct and the maternal genetic effects were included. Average weights were 4.31±0.02, 32.4±0.36 45.1±0.43, 53.4±0.55 kg; 315±4 and 76±2 g for BW, 3 MW, 6 MW, 12 MW, PRDG and PSDG, respectively. All environmental factors were statistically significant, except age of dam for PSDG. Estimates of direct and maternal heritabilities were 0.14, 0.16; 0.29, 0.03; 0.31, 0.05; 0.38, 0.09; 0.29, 0.03 and 0.49, 0.10 for BW, 3 MW, 6 MW, 12 MW, PRDG and PSDG, respectively. Genetic and phenotypic correlations among traits were statistically significant and favorable. In general, heritability estimates are moderate and hence, genetic progress can be achieved through mass selection.
  Ayhan CEYHAN , Tamer SEZENLER , Ismail ERDOGAN and Osman TORUN
  The present study was conducted to compare the fertility of ewes, the survival rates, and the growth performance of lambs that were crossbred by mating German Black-Headed Mutton (GBM) rams with Kivircik ewes. The average lambing rates of the GBM x K(F1), Bandirma-I and Bandirma-II genotype, and Kivircik ewes were 80.00%, 75.73%, 76.78%, and 83.72%, respectively. The differences in lambing rates between the genotypes were significant (P < 0.01). The genotypes had a significant effect on litter size at birth, but not on fecundity. The differences in lambs′ survival rates between the genotypes were significant (P < 0.05). The birth weight (BW), weaning weight (WW), and yearling live weight (YLW) of the lambs were 3.77 kg, 34.11 kg, and 43.71 kg for the GBM x K (F1); 3.74 kg, 32.98 kg, and 44.91 kg for the Bandirma-I; 3.73 kg, 33.18 kg, and 45.71 kg for the Bandirma-II; and 3.45 kg, 30.92 kg, and 42.22 kg for the Kivircik lambs. The results of this study showed that crossbreeding between the GBM and Kivircik breed did not significantly increase lamb production. However, crossbred lambs did not have significant survival problems when compared to native Kivircik lambs and had higher growth performance than purebred Kivircik lambs.
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