This study was conducted to investigate the effect of different levels of oak acorn and sex on abdominal fat and mRNA expression of pancreatic lipase gene in broiler chicken. A total of 264 one-day old boilers of male and female for Cobb 500 strain were assigned in a completely randomized design to 3 experimental groups each with 4 replicates (22 broilers per replication). In the first treatment (control), the broiler chicks were fed with early and end-of-corn diets (without oak), while in the other two treatments, the diets contained 15 or 20% oak acorn. In order to determine the effect of treatments on lipase gene expression at the age of 21 and 42 days from each treatment, 6 broilers were slaughtered and sampled from their pancreatic tissue. Gene expression data were analyzed using SAS and REST softwares. The results showed that the expression of the pancreatic lipase gene was significantly higher in 15 and 20% oak acorn treatments relative to control group (P<0.05) on day 21,however, there was no significant difference in expression of lipase gene on day 42 (P>0.05). In addition, relative weight of abdominal fat was significantly increased in both treatments of oak acorn on day 42 (P<0.05).
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