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Articles by H.R. Rahmani
Total Records ( 12 ) for H.R. Rahmani
  N. Bakhshi , G.R. Ghorbani , H.R. Rahmani and A. Samie
  Localization of normal microflora in the GIT of ruminants is an important factor, which enhances evolution of their digestive system. Probiotics are one of these options, which contribute in this manner. The present study evaluated single or twice daily milk feeding with and without probiotic on daily calves` performance. Forty Holstein calves weighing 43±5 kg were used in a completely randomized design test to study the effects of probiotic on food intake, blood characteristics and coliform bacteria population of feces. Treatments were as follows: T1) control with feeding four liters of milk twice daily, T2) probiotic with feeding four liters of milk twice daily, T3) control with feeding four liters of milk once daily, T4) probiotic with feeding four liters of milk once daily. From first day to end of the experiment (49 days) T2 and T4 received one-gram probiotic in their milk daily. Water and calf starter were offered free choice. Calves were weighed weekly. Intakes of starter were recorded daily and jugular blood sample were taken every 10 days for recording albumin (A), IgA, IgG and A/G ratio. Feces samples were taken every two weeks. Despite findings in earlier reports the results of this experiment did not confirm the positive effect of probiotic on calf performance. Feed intake mean for calves in treatment 2, was 370.8 g and for treatment 1 was 351.8 g. Body weight gain for group with probiotic (T2, T4) and control (T1, T3) was 441.5 and 422.8 g day-1, respectively. Feed efficiency for probiotic treatments and control groups was 1.3 and 1.4 g g-1, respectively. There was no significant difference (p>0.05) between probiotic and non-probiotic groups for any of the performance parameters recorded. Feed intake, body weight gain and Feed efficiency for calves feeding milk once daily and twice daily was 372.4 and 348.8 g, 381.6 and 480.9 g day-1, 1 and 1.4 g g-1, respectively. Feed intake was not significantly different (p>0.05) between groups with feeding milk once or twice daily, but body weight gain and feed efficiency were significantly (p<0.05) different between the treatments. In conclusion, probiotic used in this study did not affect the performance of dairy calves, but feeding milk once or twice daily influenced their performance.
  Gh. Sadeghi , A. Samie , J. Pourreza and H.R. Rahmani
  This study was conducted to determine canavanine content and examine the efficacy of soaking in water, acetic acid or heat treatments on the detoxification of bitter vetch for broiler chickens. A total of 1280 one-day old broiler chicks were placed in 64 pens, twenty in each pen. Treatments were included a corn -soybean based diet as control; raw bitter vetch; soaked in water (1:5, wt/vol) for 12 h, autoclaved (121oC, 20min), then dried at room temperature (SAD); coarsely ground, soaked in water for 24 h, autoclaved and dried (GSAD); coarsely ground, soaked in water for 47 h with exchange of water every 12 h, cooked (75min at 95oC) and dried (GSCD); coarsely ground, soaked at 1% Acetic acid solution for 24h at 60oC (GAAS) bitter vetch in three levels (15, 30, 45%). Each treatment replicated four times. Raw bitter vetch was contained 0.073 percent canavanine. All processing methods reduced canavanine content of seeds to a negotiable amount. Feeding of GSCD and GSAD diet resulted to higher and lower body weight (BW), feed intake (FI) and feed efficiency ratio (FER) at 21, 42 and 49 days, respectively, than other detoxification methods (P<0.05). Increasing Bitter vetch level from 15 to 30 and 45 percent significantly declined BW, FI and increased FER (P<0.05). Feeding of diet with 15% of GSCD and SAD bitter vetch resulted in performance more similar to control diet (P>0.05). Different detoxification methods had no effect on the liver weight, but pancreas weight decreased in all detoxification methods in comparison to raw bitter vetch (P<0.05). In all bitter vetch treatments liver weights were higher in 30 and 45% in comparison to15% (P<0.05). The results showed that all processing methods were efficient to eliminate canavanine from seeds and GSCD and SAD treatments were more effective to detoxification of the bitter vetch for broiler chicken.
  N. Vali , M.A. Edriss and H.R. Rahmani
  In order to estimate genetic parameters for body weights and carcass yield of 2 strains of quails; 32 pairs of Japanese quail (coturnix Japanese) and 26 pairs of range quail (coturnix ypisilophorus) randomly were selected from the base populations of parents. Produced progenies (650 birds) were used to estimate the genetic parameters of body weights and carcass characteristics traits. Body weights at 35, 42 and 49 days of ages were significantly different, while there was no significant difference for body weights at 63 days of age (p>0.05). Carcass weight, carcass percent, breast weight and thigh percent were significantly affected by strain source of variations (p<0.1). Estimated heritabilities for different traits were from 0.030±0.090 for breast weight of coturnix Japanese to 0.787±0.406 for thigh weight of coturnix ypisilophorus. Genetic correlation among body weights at 35, 42, 49, 63 days of age and among carcass traits (carcass weight, breast weight and thigh weight) were all positive and high, while genetic correlation for breast percent, and carcass percent were low. Genetic correlation of thigh percent with the other considered traits was negative except body weight at 42 days of age, which tended to be low.
  H.R. Taheri , H.R. Rahmani and J. Pourreza
  This study was conducted to determine the effect of different levels of oil extracted propolis (OEP) on humoral immunity of broilers from 1st to 7th week of age. The experiment started with 672 chicken (Ross 308, 336 marked male and female), in a completely randomized design test with 7 treatments, 4 replicates and 24 chicken (12 male, 12 female) per treatment. Chicken received the normal soybean meal-corn diet supplemented with 0 (control), 40, 70, 100, 400, 700 and 1000 mg/kg of OEP. Immunization program included vaccination against infectious bronchitis virus (IB, H120 on days one and 8 spray; H52 on day 30 drinking), Newcastle disease (ND, B1, day 10, eye drop; Lasota days 20 and 32 drinking) and infectious bursal disease (BD, or Gumboro, D78, days 12 and 24, eye drop). Blood samples were collected two times on days 21 and 42 of age, via brachial vein from one male and one female of each replicate and plasma was separated by centrifugation. Antibody concentration against IB, ND, BD and avian influenza (AI) were measured by ELISA method. Results indicated that antibody titer against AI, ND and BD were significantly (P<0.05) increased with OEP supplementation, without any effect on IB. Relatively negative effect of higher concentration of OEP on humoral immunity of broilers, concluded that broiler`s immune system may respond to OEP on a crucial dosage.
  A.H. Mahdavi , H.R. Rahmani and J. Pourreza
  The effect of probiotic supplements (0, 400, 1000 and 2000 gr Bioplus 2B ton-1 feed providing 0, 1.28x106, 3.2x106 and 4.6x106 cfu gr-1 feed concentration) on egg quality and laying hen`s performance was investigated on eighty white leghorn Hy-Line, W-36 strain. Evaluated traits were egg production, egg weight, egg mass, feed consumption, feed conversion ratio, shell thickness, shell hardness, Haugh unit,egg cholesterol, plasma cholesterol, plasma triglyceride and histological changes of duodenum. Although, using the different levels of probiotic caused highly significant increase (P< 0.01) in goblet cell numbers, significant increase (P< 0.05) in destroying apical cells of villus and significant decrease (P< 0.05) in plasma cholesterol, plasma triglyceride and egg cholesterol (mg gr-1 of yolk), but it had no significant effects on other traits.
  H.R. Rahmani and W. Speer
  Animal nutrition as a scientific field is based on many basic sciences, such as chemistry, biochemistry, physiology and even microbiology. In this relation broiler production is one of the economic ways for protein supply. Regarding more than 32 antimicrobial compounds which is used in poultry production without any prescriptions and entering these compounds in human nutrition is considered more seriously. Recent advances in this field suggest using pre- and pro-biotics are more beneficial than antibiotics and have fewer disadvantages. This study was conducted to compare the effects of using an organic acid (citric acid) and natural additive (APC) on broiler performance and its relation with gut circumstances. 960 sexed Ross 308 chicken in a completely randomized design test in 6 groups with 4 replicates received corn-soybean meal based diet (control, group C) supplemented with 2% citric acid (group B) or 0.2% APC (group A). Body weight (BW), feed conversion ratio (FCR), duodenum and jejunum pH, ileum microflora, gut histological changes and serum gamma globulin were evaluated on days 21 and 42. Analyzed results and compared means by Duncan`s range test showed that microflora content of the intestine is dynamically changed by adding these compounds and decreasing the pH of intestine significantly (p< 0.05) affects broiler performance and other parameters by acting on microbial population of digestive system.
  F. kheiri and H.R. Rahmani
  This study was conducted to evaluate different levels of calcium (Ca) and phosphorous (P) on ileum microbial content, and performance of broilers. In a completely randomized design test with four treatment diets containing; NRC level (control), 10, 20 and 30% lower than NRC level of Ca and P with four replicates and 30 Ross broiler chicken per replicate in 44 days (12-56 days of age), food consumption, feed conversion ratio (FCR), serum and tibia Ca and P, and duodenal and jejunal epithelial protein were evaluated weekly. Results indicated that serum Ca and P was not affected at all, in contrast, Ca and P content of the tibia were significantly (p< 0.05) affected, with the lowest level in 30% reduced group. FCR was also influenced by the levels of Ca and P on the diet significantly (p< 0.05) which reduced by decreasing their levels. Reduction of Ca and P of the ration did not affect the microbial content of the ileum but affected the protein content of the intestinal epithelium significantly (p< 0.05) in different weeks.
  A. Zamani , H.R. Rahmani and J. Pourreza
  This experiment was conducted to evaluate the effects of supplementing the diet of laying hens with a combination of Zn and Mn on performance traits and broken eggs in a Completely Randomized Design with a 4x4 (16 treatment) factorial arrangement. Three hundred and twenty, 28 weeks old white leghorn laying hens, strain Hy-Line W36 were divided into 64 groups, five hens per group and each four groups were assigned to one of the 16 experimental diets. Sixteen experimental diets contained a corn-soybean basal diet containing 50 mg kg-1 Zn and 30 mg kg-1 Mn supplemented with 0-0, 0-30, 0-60, 0-90, 50-0, 50-30, 50-60, 50-90, 100-0, 100-30, 100-60, 100-90, 150-0, 150-30, 150-60 and 150-90 mg kg-1 of Zn and Mn, respectively. The results indicated that Mn and Zn in combination, Mn alone and age had not any effect on egg output, feed consumption and feed conversion ratio. Mn and Zn alone and in combination had a significant (p<0.05, p<0.05 and p<0.01, respectively) effect on broken eggs. Different levels of Zn had significant (p<0.05) effect on egg production, without any effect on egg output, feed consumption and feed conversion ratio. Age of birds had significant (p<0.05) effect on feed consumption but did not affect egg output, egg production and feed conversion ratio.
  N. Vali , M.A. Edriss and H.R. Rahmani
  In order to determine characteristics for hatching of two quail strains 1500 eggs of Japanese quail (Cotunix Japanese) and 1200 eggs of Range quail (Coturnix ypsilophorus) were randomly selected from breeder quails (8-16 weeks of ages). The eggs were incubated in artificial incubation in six hatches. Fertility and hatchability of fertile eggs were 74.5±7.9 and 72.46±10.73, respectively. Egg, shell and chicken weights were 10.68±1.01, 0.82±0.08 and 7.547plusmn;0.84, respectively. Chicken and shell weights were significantly affected by strain (p<0.01), while there was no strain effects for fertility, infertility, egg weights (p>0.05). Hatchability (fertile and total eggs), egg weights, chicken weights, shell weights were significantly different in six hatches, while there were no significant differences for fertility and infertility of eggs.
  A. Zamani , H.R. Rahmani and J. Pourreza
  An experiment was conducted to evaluate the effects of supplementing the diet of laying hens with a combination of Zn and Mn on eggshell quality. Six hundred and forty white leghorn laying hens, strain Hy-Line W36 were divided into two groups according to age (28 and 44 week old). Each group then was divided into 64 and five birds per group (totally 128 groups). In both groups every four cages were assigned to one of the 16 experimental diets. Sixteen experimental diets included a corn-soybean basal diet containing 50 mg kg-1 Zn and 30 mg kg-1 Mn supplemented with 0-0, 0-30, 0-60, 0-90, 50-0, 50-30, 50-60, 50-90, 100-0, 100-30, 100-60, 100-90, 150-0, 150-30, 150-60 and 150-90 mg kg-1 of Zn and Mn, respectively. Addition of Zn increased eggshell thickness, concentration of Ca in eggshell and eggshell index and decreased concentration of P in eggshell significantly (p<0.05) and did not affect the following measures of eggshell quality: percentage, stiffness, elastic modulus, breaking strength and fracture toughness of eggshell and egg weight. In contrast addition of Mn increased percentage, stiffness, elastic modulus, breaking strength and fracture toughness of eggshell significantly (p<0.05), but did not affect the following measures of eggshell quality: Concentration of P and Ca, index and thickness of eggshell and egg weight. Addition of Zn and Mn in combination increased percentage, index (shell weight per unit surface area), stiffness, elastic modulus, breaking strength, thickness, fracture toughness and concentration of Ca in eggshell and decreased concentration of P in eggshell and did not affect egg weight. In older hens there was a significantly increase in egg weight, breaking strength, elastic modulus, stiffness and fracture toughness of eggshell and significantly (p<0.05) decrease in thickness, percentage and index of eggshell without any effect on concentration of P and Ca in eggshell.
  H.R. Ziaran , H.R. Rahmani and J. Pourreza
  This investigation was conducted to determine the effect of different levels of Oil Extract of Propolis (OEP) on immune system of broiler chickens from 1 to 47 days of age. Chicks were fed soybean meal-corn diets supplemented with levels of 0, 40, 70, 100, 400, 700 and 1000 mg kg-1 of OEP from hatching. On days 20 and 32, they were immunized with Newcastle Disease Virus (NDV) and examined 10 days later. In general, the immune system can be stimulated by addition of OEP, without affecting the performance. At 30 days of age after immunization at 20 days, antibody response to NDV was significantly increased in chickens fed with 70 and 100 mg kg-1 of OEP in the diet (p<0.05). No effect of dietary OEP was observed on the ratio of gamma globulins to total serum proteins. Heterophil to lymphocyte ratio was significantly decreased in chickens fed with 40 and 70 mg kg-1 of OEP in the diet (p<0.05). Investigation of histological sections revealed that the number of proliferating cells of bursa of fabricius was increased in chickens fed with 1000 mg kg-1 of OEP in the diet. When broilers received the high levels (400, 700 and 1000 mg kg-1) of OEP in the diet the number of leukocytes in the lamina propria of intestine was higher compared with other levels of dietary OEP. The number of lymphoid cells in the preportal area of the liver increased at the highest dose (1000 mg kg-1) of OEP and the thickness of blood vessels wall increased at control treatment. The results indicate that both humoral and cellular immune responses were modulated by different levels of OEP in the diet and suggest that low levels (40 and 70 mg kg-1) of dietary OEP developed the immune response, whereas the chickens fed highly enriched OEP diet, showed lower immune response.
  A.H. Mahdavi , H.R. Rahmani , J. Pourreza and M.A. Edriss
  The purpose of this study was to investigate the effect of probiotic (0, 400, 1000 and 2000 g Bioplus 2B ton-1 feed providing 0, 1.28 x 106, 3.2 x 106 and 4.6 x 106 cfu g-1 feed concentration) in different levels of barley substitution for corn diets (0, 50 and 100%) on laying hen`s performance, egg quality, blood factors and histological changes in duodenum. Evaluated traits were egg production, egg weight, egg mass, feed consumption, feed conversion ratio, shell thickness, shell hardness, Haugh unit, egg cholesterol, plasma cholesterol, plasma triglyceride and histological changes of duodenum. Using different levels of substitution of barley for corn showed highly significant decrease (p<0.01) in feed consumption and feed conversion ratio, highly significant increase (p<0.01) in goblet cell numbers and epithelium surface folds of villus, significant increase (p<0.05) in egg weight and damaged apical cells of villus, without any effect on other traits. Although, using the different levels of probiotic caused highly significant increase (p<0.01) in goblet cell numbers, significant increase (p<0.05) in feed consumption, feed conversion ratio and destroying apical cells of villus and significant decrease (p<0.05) in plasma cholesterol and triglyceride, but it had no effects on other traits. Consumption of probiotic alone had no effect on egg cholesterol (mg g-1 of yolk), but caused significant decrease (p<0.05) in egg cholesterol (mg g-1 of yolk) among fourth level of probiotic and another levels, in corn based diets. Interaction of different percentages of substitution of barley for corn and probiotic levels had highly significant effect (p<0.01) on feed consumption, feed conversion ratio and egg cholesterol (mg g-1 of yolk) and significant effect (p<0.05) on Hough unit.
 
 
 
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