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Articles by M.T. Beigi Nassiri
Total Records ( 2 ) for M.T. Beigi Nassiri
  M.T. Beigi Nassiri , Z. Hamidi and S. Tavakoli
  Blood samples of Mazandaran native chickens were collected. A total of 90 genomic DNAs were isolated through optimized and modified salting-out procedure. The samples were used in Polymerase Chain Reaction (PCR) with 20 micro satellite markers. Amplified PCR-products with the markers were separated on 8% denaturing polyacrylamide gel. One locus (MCW216) was monomorphic. According to allele frequencies of 20 micro satellite sites, mean heterozygosity (H) and Polymorphism Information Content (PIC) were calculated. The number of alleles varying from 1 to 6 and an estimate of average heterozygosity excluding the monomorphic data was calculated as 0.5872. The average heterozygosity and PIC value calculated from data on polymorphic and monomorphic loci was 0.5579 and 0.4939, respectively. The results of the heterozygosity were consistent with that of PIC. Diversity estimates in this study are lower than the observed frequencies of heterozygotes reported in other species using micro satellite markers. Other parameters for intrapopulation variation and Hardy-Weinberg proportions were also considered. All the loci except MCW222 and MCW165 showed deviations from Hardy-Weinberg equilibrium (p<0.005). Some of micro satellite sites were highly polymorphic, so they were effective markers for genetic diversity analysis. These results could provide basic molecular data for the research on the germplasm characteristics of Mazandaran native chickens.
  K. Mohammadi , M.T. Beigi Nassiri , J. Fayazi , H. Roshanfekr and A. Aghaei
  Genetic parameters and (co) variance components were estimated on 2445 lambs from 139 sires and 804 dams for Birth Weight (BW) on 2237 lambs from 127 sires and 784 dams for Weaning Weight (WW) and on 2098 lambs from 115 sires and 739 dams for Average Daily Gain (ADG). The data collected from Animal Science Research Station of Agricultural and Natural Resources Ramin (Khuzestan) University during 2001-2008. Analyses were carried out by Restricted Maximum Likelihood (REML) method. Six different animal models including or ignoring maternal genetic or permanent environmental effects were fitted for traits. The Model 3 with only maternal additive effects seemed most suitable. Influencing factors such as birth year, birth type, lamb’s sex and dam’s age were investigated as the fixed effects for the models. Estimates of direct heritability from model 3 were 0.194 for birth weight, 0.163 and 0.149 for weaning weight and average daily gain, respectively. Maternal heritability estimates for birth weight, weaning weights and average daily gain were 0.15, 0.11 and 0.09, respectively. For these traits, correlation estimates between direct additive and maternal genetic (ram) effects were high and negative ranging from -0.57 to 0.93. Bivariate analysis by Model 3 was also used to estimate genetic correlations between traits. The estimates of genetic, phenotypic and environmental correlations among traits were positive and intermediate to high in value. The results indicate that in addition to additive direct effect, additive maternal effect for all traits was important.
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