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Articles by T. Farahvash
Total Records ( 4 ) for T. Farahvash
  T. Farahvash , Sh. Golzar Adabi , A. Ahmadzadeh and J. Davoodi
  The objective of this retrospective study was to investigate the potential factors affecting sex ratio on dairy herds in East Azarbaijan province of Iran. The data used in this experiment were collected from 186 registered dairy herds are routinely compiled on a monthly basis (from June 1990 to July 2007). For statistical analyses, sex ratios were compared with expected value using goodness-of-fit Chi-square ( χ2) analysis. The effect of some factors such as herd size, artifical insemination year and kind of frozen semen (internal and external ) on sex ratio was determined. Statistical analysis of data shown that herd size had significant effect on sex ratio (χ2 = 5.989, df = 4, p < 0.05). The χ2-test for year variables were significant (χ2 = 52.496, df = 17, p < 0.01), Also the effect of frozen semen (internal and external) on sex ratio was not significant (χ2 = 5.893, df = 7, p > 0.05). Results suggested a positive effect of herd size and year on sex ratio therefor it is possible using this result as a practical and inexpensive method of sex ratio modification.
  Sh. Golzar Adabi , A. Haji Babaei , H. Lotfollahian , T. Farahvash and F. Moslemi Pour
  To investigate the effect of dietary L-carnitine on ostrich sperm quantity and quality, a study was conducted in a completely randomized design consisting of three treatments and four replicates (total 12 male ostriches). The experimental rations were prepared using different levels of carnitine (L1 = 0, L2 = 250 and L3 = 500 mg kg-1). Ejaculates were collected by massage method once a month for three months. The ejaculate volume, total sperm numbers per ejaculate, concentration of spermatozoa, sperm motility, live sperm percentage and abnormal sperm percentage were measured. Semen volume in both groups (250 and 500 mg kg-1) was higher than control group, (p < 0.01), L-carnitine treated ostriches (250 and 500 mg kg-1) have increased sperm count, sperm motility, live sperm (p < 0.05) but L-carnitine had no significant effect on abnormal sperm. According to this study it is recommended to use 250 mg kg-1 L-carnitine in order to increase the ejaculate quality in ostriches.
  T. Farahvash , J. Shodja , A. Rafat and A. Keshtkaran
  In order to study the effect of bilateral crossbreeding between Arkhamerino (Ar) and Ghezel (G) sheep on the quality of wool produced by their F1 crosses, 16 ArkhamerinoxGhezel (ArG) F1 sheep and 53 GhezelxArkhamerino (GAr) F1 sheep were sampled. Fiber Diameter (FD), Coefficient of variation of fiber diameter (CVf) and Staple Length (SL) were traits measured on wool samples. The variations between obtained data were analyzed for genotype, sex and birth type. The results showed that the FD was not affected by any of the factors in model. Genotype, had significant effect on CVf and SL (p<0.01) and the effect of sex on the SL was significant (p<0.01). Also twin F1s produced longer staples than single crosses (p<0.01). Bilateral crossbreeding between Ar and Gh sheep did not make considerable changes in FD of wool produced by their F1 crossbreds but CVf and SL of wool have been influenced.
  A. Lavvaf , A. Noshari and T. Farahvash
  In order to evaluate the relation between body measurements (body length, stator, chest girth, body depth and romp width) with carcass traits (live weight, warm carcass weight, warm carcass efficiency, warm carcass weight without fat-tail and warm carcass without fat-tail efficiency), records from 200 Afshari and Zandi rams collected. Genetic group had effect on the warm carcass efficiency (p<0.01) and Zandi rams had higher efficiency. Chest girth affected by genetic group (p<0.05) which Afshari rams had bigger chest girth. Both genetic groups had high correlations between chest girthxlive weight, romp widthxlive weight, chest girthxwarm carcass weight without fat-tail, live weightxwarm carcass weight without fat-tail, warm carcass weightxwarm carcass weight without fat-tail. Results showed that chest girth was the best index in predicting body weight to 6 months of age at both genetic groups. Live weight at 6 months could be used to predict the warm carcass weight and warm weight without fat-tail. Chest girth and romp width in Afshari and Zandi, respectively were suitable factors for predicting warm carcass weight and warm carcass weight without fat-tail.
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