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Articles by Hedayatollah Roshanfekr
Total Records ( 2 ) for Hedayatollah Roshanfekr
  Mostafa Lotfi Farokhad , Hedayatollah Roshanfekr , Saeed Amiri , Kourosh Mohammadi and Khalil Mirzadeh
  In this study, 6574 growth trait records of Arman sheep bred and reared in Abbas-Abad sheep breeding station, Mashhad, Iran during 1997-2007 were used to estimate the genetic trends for some of the growth traits using Animal model for lambs, rams and ewes. Genetic trends were estimated for Birth Weight (BW), Weaning Weight (WW) and 6 Months Weight (6 MW) traits. Appropriate models from single and three-trait analysis were applied for research of traits. Predicted breeding values averaged by year of birth from both the single and three-trait analysis for growth traits increased over time. Genetic trends of studied traits were estimated by regressing mean of breeding values on birth year. Direct genetic trends were positive and highly significant (p<0.01) for BW, WW and 6 MW and were 2, 7 and 8 g year-1, respectively. Also, maternal trends for BW and WW were positive and highly significant (p<0.01) and were 22 and 7 g year-1.
  Mojtaba Lotfi , Mohammad Taghi Beigi Nassiri , Hedayatollah Roshanfekr and Jamal Fayazi
  Major Histocompatibility Complex (MHC) plays a pivotal role in antigen presentation for eliciting immune responses against invading pathogens. The best-characterized genetic control of disease resistance and immune response in animals are associated with MHC. Therefore in this study polymorphism of ovar-DRB1 in DNA samples of 111 heads Arabi sheep using Polymerase Chain Reaction (PCR) and Restriction Fragment Length Polymorphism (RFLP) method was examined. Identities of 18 different patterns and 8 distinct DRB1 alleles among Arabi sheep have been determined. There is not deviation in Ovar-DRB1 gene from Hardy-Weinberg equilibrium in this population results showed. Obtained results have revealed that the exon 2 region of ovar-DRB1 was highly polymorphic on Arabi sheep.
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