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Articles by Homayoun Farhangfar
Total Records ( 2 ) for Homayoun Farhangfar
  Rouhollah Nourmohammadi , Seyed Mohammad Hosseini and Homayoun Farhangfar
  Problem statement: The aim of this study was to investigated the effects of adding citric acid and microbial phytase supplementation (Natuphos®) on growth performance and carcass characteristics of broiler chickens fed corn soybean meal base diets. Approach: The experiment included nine treatments with 10 birds in each replicate using a 3x3 factorial design for two main factors of citric acid (0, 3 and 6%) and three phytase enzyme (0, 500 and 1000 IU kg-1). The diets were formulated based upon corn-soybean meal 7 to 21 and 22 to 42 day periods. Results: Using different levels of citric acid in diets had no effect on internal organs (except relative heart weight), whereas, diets containing 6% citric acid decreased feed intake, body weight gain and carcass yield (p<0.05) and improved feed conversion ratio and organs relative weight. Also, microbial phytase caused increase in feed intake, weight gain and relative neck weight (p<0.05). Conclusion: Depression of performance was differently affected by citric acid levels. Also, there was an additive effect between microbial phytase and citric acid.
  Rouhollah Nourmohammadi , Seyed Mohammad Hosseini and Homayoun Farhangfar
  A total number of 90 Ross 308 broiler chickens were randomly divided into three treatments with three replicates of 10 chicks each. The first treatment having 0% citric acid was served as control and fed corn-soybean meal base diet. While, the other two treatments were received the basal diet supplemented with citric acid at different levels of 3 and 6%, respectively. The experiment was lasted for 42 days. Some blood parameters (metabolites of serum, enzyme activities and plasma mineral concentrations), Gastrointestinal tract (GI-tract) morphology and weekly performance were measured. The results indicated that diets including citric acid had significant effect (p<0.01) on weekly feed intake, body weight gain and body weight but there was no significant improvement on feed conversion ratio during any experimental weeks. Also, citric acid had significant effect on carcass yield (p<0.01) and relative heart weight (p<0.05) but had no significant effect on relative weights of liver and abdominal fat. The effect of citric acid was significant on GI-tract morphology, cholesterol concentration, serum alkaline phosphatase and lactate dehydrogenase activities (p<0.05) but did not significantly affect urea, triglycerides, total protein concentrations and serum alanine aminotransferase and aspartate aminotransferase activities. Dietary effect of citric acid was significantly shown on plasma P and Fe concentrations (p<0.05) but not shown on plasma Ca, Mg and Zn concentrations. The results showed that addition of 3% citric acid significantly improved weekly growth performance but adding 6% citric acid had a negative effect on weekly performance factors of broiler chicks.
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