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Articles by Reza Tohidi
Total Records ( 2 ) for Reza Tohidi
  M.R. Nassiry , A. Javanmard and Reza Tohidi
  Problem statement: A wide range of studies for the assessment of genetic diversity in livestock breed were conducted using genetic distance. For high-accuracy and unbiased estimation sampling methods, criteria of choosing type of DNA markers, distance measurement strategies, cluster analysis will be important for any genetic diversity projects. Approach: Main objective of this short review is focusing on application statistical procedures and methods in analysis of genetic diversity data in animals. Results: There is no simple strategy to address for best and effectively genetic diversity results by the way regarding to some important factors can make reliable results for next analysis. Conclusion: There is still a distinct need for developing comprehensive and user-friendly statistical packages that facilitate an integrated analysis of different data sets for generating reliable information about genetic relationships, genome diversity, and favorable allele variation. Equally important and perhaps more challenging, is the concerted and planned utilization of genome information in animal breeding programs on the basis of knowledge accrued from studies on genetic diversity.
  Cyrus Farasati and Reza Tohidi
  The influences of dopamine (DA) and zinc (Zn) on some physiological parameters of plasma such as growth hormone, cholesterol, 3-glyceride and growth rate, feed conversion ratio and abdominal fat of broilers between the ages of 21 to 42 day were investigated. The experiment was designed on a total of 180 commercial meat-type chicks as a randomized complete block with a 3x2x2 factorial arrangement of treatments with three levels of DA (0, 50 and 100 mg kg-1) and two levels of Zn (0 and 40 mg kg-1) in each sex. At the first day of trial, chicks were randomly distributed in 36 boxes at the same condition until day 15. Then, the treatments were administered in a low dosage for acclimating of chicks to them. From day of 21, the main dose of treatments was used. The effects of DA and Zn and interaction between them on cholesterol concentration of plasma were significant (p<0.05). But the effects on concentration of growth hormone (GH) and 3-glyceride of plasma were not significant. The maximum concentration of cholesterol in plasma was observed in male chicks administered 40 mg kg-1 of Zn and the minimum concentration was related to female chicks administered 50 mg kg-1 of DA. In this period, the main and interaction effects of all treatments on weight gain mean of chicks were significant. Also, Zn and DA and interaction of DAxsex improved feed conversion ratio (p<0.05). The results of this experiment confirmed the lipolytic effect of DA on plasma cholesterol and abdominal fat and also showed that consumption of 100 mg kg-1 of DA plus 40 mg kg-1 of Zn cause to improve growth performance of male chicks.
 
 
 
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