Cilek, S., H. Orhan, A. Kaygisiz and E.H. Sahin, 2008. Estimation of breeding values of Anotolian population of Simmental cows test day milk yields. Arch. Zootech., 11: 79-85.

Orhan, H. and A. Kaygısız, 2009. Genetic and environmental parameters effecting racing performance of turk-arabian horses raised at anatolian state farm. Asian J. Anima. Vet. Adv., 5: 112-119.
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Orhan, H. and A. Kaygisiz, 2002. Comparison of different lactation curve models for Holstein cattle. J. Anim. Prod., 43: 94-99.

Orhan, H. and D. Kaşıkçı, 2002. A study on comparison of the correlation, path and partial regression coefficients. J. Anim. Produc., 43: 68-78.
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Orhan, H. and H. Okut, 1996. Comparing of the maximum likelihood (ML) and the least squares (LS) methods in terms of variance components for unequal numbers of abservations in subclasses. Türk Veterinerlik ve Hayvancılık Dergisi, 20: 293-297.
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Orhan, H. and S. Yasar, 2010. A model to analyse and classify the level of farmer`s qualification in sustainable dairy farming. J. Anim. Vet. Adv., 9: 159-168.
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Orhan, H., E. Erensayın and S. Aktan, 2001. Determining egg quality characteristics of japanese quails (Coturnix Coturnix Japonica) at different ages. J. Anim. Produc., 42: 44-49.
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Orhan, H., I. Ozturk and Z. Dogan, 2009. Comparison of principal component analysis and multidimensional scaling methods for clustering some honey bee genotypes. J. Anim. Vet. Adv., 8: 413-419.
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Orhan, H., I. Ozturk, S. Yurtseven and Z. Dogan, 2009. Examining structural distribution of livestock in eastern and South-Eastern Anatolia of Turkey by multivariate statistics. J. Anim. Vet. Adv., 8: 481-487.
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Vanlı, Y., H. Orhan and S. Baş, 1997. The effects of linear models assumed for the analysis of environmental sources of variation upon parameter estimates: I. Models and environmental parameters. Turk. J. Vet. Anim. Sci., 21: 233-245.
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Yasar, S., H. Orhan and C. Erensayin, 2003. Examining the nutritional and production charecteristics of egg-farms in Basmakci County in Turkey. World Poult. Sci. J., 59: 249-259.
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