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Articles by R. Jahanian
Total Records ( 4 ) for R. Jahanian
  H. Hamidi , R. Jahanian and J. Pourreza
  This study was conducted to investigate the effect of dietary betaine on performance, humoral immunity, intestinal immune responses and gut contents osmolarity of broilers in coccidiosis condition. Three supplemental betaine levels (0, 0.6 or 1.2 g kg-1) were fed to 189 mixed-sex broilers chicks which were randomly assigned to 9 floor cages in a completely random design with 3 replicates. To simulate a coccidiosis challenge, at day 28 of age the chickens were inoculated with a mixed culture of Eimeria tenella and Eimeria acervulina via the drinking water. Antibody response to Sheep Red Blood Cell (SRBC) was determined on day 21. The immunoglobulin A (IgA) content was quantified in sera and mucous membrane tissue of intestine. Ileum and cecum contents were measured for osmolarity at 21 and 42 days of age. The supplemented diets with 1.2 g kg-1 betaine improved average daily gain and feed conversion ratio in 21-42 and 7-42 days periods. Antibody response to SRBC was not affected by dietary treatments. Interestingly, sera IgA content was increased in birds subjected to coccidiosis-infection. The IgA content of both sera (p<0.05) and gut tissue (p<0.01) were increased by added betaine to diet. Variations in osmolarity and moisture of both ileum and cecum contents were similar and they were significantly (p<0.001 and p<0.05, respectively) decreased in day 42 measurement by betaine inclusion into the diet. Positive effects of dietary betaine on performance, immunity and digesta moisture and osmolarity redoubles the importance of adding betaine to diet of broilers especially, in stress conditions like coccidiosis-infection.
  R. Jahanian , H. Nassiri Moghaddam , A. Rezaei and A.R. Haghparast
  The present study was performed to evaluate the effects of dietary zinc-methionine (ZnMet) supplementation on broiler performance and carcass characteristics. Three added zinc levels (40, 80 and 120 mg kg-1) from each of zinc sulfate or ZnMet were used in a 2x3 factorial arrangement with four replicates of ten birds. Two hundred-forty day-old broiler chicks were fed with the experimental diets from 1 to 42 days of age and at the final day of experiment two randomly selected birds from each replicate were slaughtered and carcass parameters were measured. Inclusion of ZnMet into the diets caused to significant (p<0.01) increase in feed intake. Almost in all cases, increasing supplemental Zn level as either Zn sulfate or ZnMet sources lowered feed consumption. Body weight gain was affected (p<0.01) by zinc source in all experimental periods, with the highest weight gains assigned to chicks fed on ZnMet-supplemented diets. Except for week 1, feed conversion efficiency was not affected by Zn source or dietary Zn concentration. Increasing supplemental Zn level from 40 to 80 mg kg-1 from both Zn sources caused increase in liver weight percentage, but this parameter was reversely affected by further increase to 120 mg added Zn kg-1 of diet. Pancreas, heart and thigh weight percentages were not affected by dietary treatments; however, carcass and breast meat percentages were increased by dietary ZnMet supplementation. The present results suggest that dietary supplementation with more available Zn sources can improve production economics.
  H. Nassiri Moghaddam , R. Jahanian , H. Jahanian Najafabadi and M.M. Madaeni
  Natural zeolites have been shown to influence calcium and phosphorus utilization in laying hens. A 4x2 factorial arrangement of treatments was used to investigate the effects of dietary inclusion of zeolite (0, 1.5, 3 and 4.5% of diet) into the diets with sufficient or deficient Ca (3.26 and 2.45%) and non-phytate P (0.25 and 0.19%) contents on egg performance and egg quality parameters of 28 week-old Hy-Line (W-36) Leghorn hens. The trial lasted 98 days (2 week adaptation and 12 week recording periods), when the hens were 42 week-old. Significant dietary effects of feeding zeolite were observed for hen-day egg production, egg mass, egg weight, Haugh score and shell thickness at the initial 6 weeks of recording period, while dietary zeolite supplementation tended to/or had no significant effects on studied parameters at the second 6 weeks of experimental period. Dietary added zeolite caused a significant increases in egg weight (p<0.05) and egg production and egg mass (p<0.01). Hen-day egg production and egg mass at the second 6 weeks of recording period were significantly improved (p<0.01) by feeding low non-phytate P (NPP) diets. There was a significant interaction between NPP level and added zeolite for egg production (36 to 42 weeks of age), egg weight and eggshell thickness (30 to 36 weeks of age) and egg mass. Dietary Ca level interacted with P level for shell thickness, eggshell percentage and shell ash, so that the given parameters were affected by Ca:NPP ratio other than dietary Ca and NPP contents. In general, the present findings indicate that dietary inclusion of zeolite up to 1.5% has a potential to improve laying performance, particularly eggshell quality.
  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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