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Articles by Ali Khosravi
Total Records ( 3 ) for Ali Khosravi
  Ali Khosravi , Fathollah Boldaji , Behrouz Dastar and Saeed Hasani
  This study was conducted to compare the broiler performance and carcass measurements fed diets containing a probiotic and an organic acid with those fed a diet containing antibiotic. In a completely randomized design, 320 commercial broilers were assigned to four dietary treatments. A control negative diet was prepared based on NRC recommendations. For preparing other diets, control diet was supplemented with a probiotic, propionic acid and an antibiotic (positive control) at the levels of 0.1, 2 and 1 g kg-1 of diet, respectively. Metabolic body weight and feed intake were recorded on days 14, 28 and 42. At the day 43, one male chicken from each pen was randomly selected and killed for determining the carcass parameters. Metabolic weight gain just was significantly increased during the first 2 week by propionic acid. The birds fed probiotic and propionic acid, either significantly or numerically, had better feed efficiency and lower metabolic feed intake than negative control. Thigh, breast, abdominal fat and carcass yields were unaffected by probiotic and propionic acid compared to negative control birds. No significant differences were observed in viability index among experimental groups. Although there were significant differences in performance index among the negative control group and those supplemented by propionic acid and probiotic groups during the first and the second 2 week, this difference just remained significant for propionic acid during the second 2 week. In conclusion, probiotic and especially propionic acid have potential to be used as suitable alternatives to antibiotic growth promoters in starter phase of broilers nutrition.
  Ali Khosravi , Fathollah Boldaji , Behrouz Dastar and Saeed Hasani
  This study was undertaken to investigate the effects of some feed additives on the performance and blood parameters of broilers. In a completely randomized design, 320 1-d-old chicks were divided into four replicate groups. A control diet was prepared, based on NRC recommendations. For preparing other diets, control diet supplemented with propionic acid, protexin and nettle extract at the levels of 2, 0.1 and 1 g/kg of diet, respectively. Diet contained propionic acid resulted in significant increase in BWG during the starter and from 0-42 periods. The birds fed control diet had more FI and PI during the finisher period than those fed propionic acid. When diet supplemented with propionic acid and protexin, a significant improvement in FCR and PER was observed among this diets and other diets. Propionic acid also significantly increased HDL and decreased LDL compared to other feed additives. In conclusion, based on the results of this experiment, propionic acid and protexin can be used as a suitable alternative to antibiotic growth promoters whereas nettle extract can not.
  Ali Khosravi , Fathollah Boldaji , Behrouz Dastar and Saeed Hasani
  This study was conducted to evaluate the effects of dietary protexin, propionic acid and a blend of protexin and propionic acid on the immune response and the performance of broiler chicks. In a completely randomized design, three hundred and twenty broiler chicks were divided into 4 groups (each group consisting of 16 unsexed 1-d-old chicks) and reared on floor pens for 42 days. Dietary treatments consisted of a control diet without any additives, the control diet + 0.1 g/kg protexin, the control diet +2 g/kg propionic acid, and the control diet + 0.1 g/kg protexin + 2 g/kg propionic acid. On the 42 day, body weight gain and feed intake of chicks were calculated. On the same day, one male chick from each pen, which was the nearest to mean weight, was bled to determine blood parameters. Feed conversion ratio for birds fed a diet of propionic acid and a protexin + propionic acid differed (p <0.05) from control birds. Although body weight gain was numerically higher in the birds fed feed additives than the control diet, body weight gain for these birds did not differ (p>0.05) from control birds. There were no significant differences for feed intake and blood parameters among the dietary treatments. In conclusion, based on the results of the experiment, propionic acid and protexin have the potential to be used as feed additives in broiler diets.
 
 
 
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