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Articles by Jamal Fayazi
Total Records ( 2 ) for Jamal Fayazi
  M. Nazari , Jamal Fayazi , S. Tabatabaei , A. Aghaei and Morteza Mamoei
  The main objective of this study was to estimate genetic and phenotypic potential of milk yield, fat yield and fat percentage traits. Data analyzed were 3350 records from buffalo during 1989-2008 were collected. Co-variance components were estimated using uni and multiple traits of animal model with the Restricted Maximum Likelihood method. In this method with constant effects of season-city-year and lactation period and additive genetic was taking as Random effect. The mean and standard deviation for milk yield, fat yield and fat percentage were 964.14±18.28, 52.35±1.88 and 5.58±0.03, respectively. The heritability of milk yield, fat yield and fat percentage were 0.22, 0.18 and 0.13, respectively using univariate model. The repeatability of milk yield, fat yield and fat percentage were 0.55, 0.41 and 0.39, respectively using univariate model. The genetic and phenotypic correlation between milk yield-fat percentage, milk yield-fat yield, fat yield-fat percentage was -0.25 and -0.30, 0.75 and 0.25, 0.29 and 0.41, respectively. The heritability for milk yield trait was moderate, so selection on the basis of this trait may cause a desirable genetic gain.
  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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