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Articles by H.R. Rahmani
Total Records ( 4 ) for H.R. Rahmani
  M.A. Edriss , P. Hosseinnia , M. Edrisi , H.R. Rahmani and M.A. Nilforooshan
  A mathematical model for prediction of second parity milk yield and fat percentage, with the use of first parity information seems to be helpful in order to predict the performance of prospective productive cows. As a tool for this prediction, back propagation neural network and multiple linear regression methods were compared based on their prediction differences with observed values. While, multiple linear regressions are based on linear relationships between variables, artificial neural network system also considers non-linear relationships between parameters. Data was collected from 4 medium sized dairy herds in Isfahan, Iran, which was divided into three parts in order to train, verify and test the artificial neutral network system and estimation of regression coefficients, verify and test the multiple linear regression method. The results of the simulation showed that evaluations from both multiple linear regression and artificial neural network methods are good predictors for second parity production estimated from first parity information. However, artificial neural network predictions showed lower differences with the observed values and better quality parameters than multiple linear regression predictions, which made this assumption that artificial neural network system is more accurate in prediction.
  A.H. Mahdavi , H.R. Rahmani , N. Nili , A.H. Samie and S. Soleimanian-Zad
  The growth inhibitory effect of egg yolk antibody (IgY) powder for food application was investigated on Escherichia coli O78:K80, as a model and the major cause of associated septicemic disease in broiler chickens. Laying hen’s hyperimmunized with E. coli O78:K80 bacteria for a 12 weeks period and IgY was isolated by the water-dilution method. E. coli O78:K80 was incubated with IgY (50, 100 and 150 mg mL-1 specific and non-specific IgY powder) for 6 h during, which samples were taken at 2 h intervals. After the first immunization, the antibody specific activity in serum and egg yolk increased and became plateau on day 7 and 14, respectively. The protein concentration of serum and IgY powder did not change during the immunization period, but the ratio of gamma globulins to total serum protein and IgY purity (total IgY in protein) of IgY powder increased (p<0.05) and remained high throughout the experimental period. Specific IgY powder at the concentration of 150 mg mL-1 decreased bacterial proliferation by 1.18 log CFU mL-1 compared with the control group at 6 h of incubation period (p<0.01). Results of this study suggest that E. coli O78:K80 could have long term antigenic properties to induce an immune response in laying hens. The large-scale and long-term production of IgY, with high purity and high specific activity, can be attained by water dilution method. The inhibitory effect of specific IgY powder may encourage IgY powder to be applied as a feed additive to protect against E. coli O78:K80.
  G.R. Shadnoush , M. Alikhani , H.R. Rahmani , M.A. Edriss , A. Kamalzadeh and M. Zahedifar
  About 48 Lori-Bakhtiari lambs were used to measure the effects of restricted feeding and re-feeding on intake, body weight and development of body organs. The feeding management was divided to Feed Restriction Period (FRP) and Re-alimentation Period (RAP). During FRP, the 18 Control (C) animals were fed a low-quality roughage, ad libitum and 40 g kg BW-0.75 day-1of concentrate and the 30 animals were only fed low-quality roughage as the Restricted (R) group. At the end of FRP and RAP, six lambs of each group were slaughtered. In the RAP, the 24 remaining lambs from restricted treatment were divided into two groups of R1 and R2 and received low-quality roughage plus 40 and 48 g kg BW-0.75 day-1, of concentrate, respectively. During FRP, Dry Matter (DMI), Metabolizable Energy (MEI) and Crud Protein Intake (CPI), Daily Gain (ADG), Final Body Weight (FBW), pelt, liver and kidneys of C group were higher (p<0.05) than R group. In the RAP all groups had similar FBW but feed conversion ratio, DMI, MEI, CPI and weights of all body organs of C group were higher (p<0.05), however ADG was lower (p<0.05) than R1 and R2 groups. In general, restricted feeding following re-feeding lambs caused more efficiency of performance which was associated with lower maintenance requirements.
  R. Jahanian and H.R. Rahmani
  This study was conducted to investigate the effect of dietary betaine (Betafine) supplementation as a replacement for choline on broiler performance and carcass characteristics. Three betaine replacement levels (0, 50 and 100% in substitution for choline) were used in two various basal diets (without or containing 30 g kg-1 oil) in a 2x3 factorial arrangement with four replicates of 10 birds. Two hundred-forty day-old broiler chicks were fed with the experimental diets from 1 to 49 days of age and at 49 days of age, two birds from each replicate were selected randomly for blood sampling and comparison of carcass characteristics. Dietary betaine inclusion had no effect on feed intake, but the significant differences in body weight (BW) gain (at 1-3 and 3-5 weeks of age) and feed conversion ratio (at 3-5 weeks of age) were observed among the experimental diets. Replacing choline with betaine increased (p<0.05) dressing and breast meat percentages and reduced (p<0.01) abdominal fat percent, but had no significant effect on thigh and liver weight percentages. Plasma levels of cholesterol and low density lipoproteins (LDL) were not affected by dietary substitution of betaine for choline. Dietary betaine replacement caused a significant decrease in plasma triglycerides (p<0.05) and very low density lipoproteins (p<0.01) and significant increase in (p<0.05) high density lipoproteins (HDL). These findings indicate that although dietary betaine inclusion instead of choline had little benefit in terms of performance parameters, but resulted favourable changes in abdominal fat and breast meat percentages.
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