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Asian Journal of Animal and Veterinary Advances
Year: 2008  |  Volume: 3  |  Issue: 5  |  Page No.: 286 - 292

The Effects of Energy Increasing and Protein Lowering by Addition of Fats to Diet on Broiler Chickens: Performance and Serum Lipids

Tohid Vahdatpour, Kambiz Nazer-Adl, Yahya Ebrahim-Nezhad, Naser Maheri-Sis and Sina Vahdatpour    

Abstract: This experiment was conducted to determine the effects of increasing, energy to protein ratio and partial decreasing of nutrient contents of diet using different levels of fats on broiler chickens performance and serum lipids. With addition of fats (Poultry oil, Soybean oil and Tallow) in two levels (4 or 8%) to basal diet that was already balanced on NRC (1994) recommendations, seven different non-isocaloric and non-isonitrogenic diets were prepared (12 or 24% increasing of energy to protein ratio in 4 or 8% of fat level addition, respectively) and given ad libitum between 22 to 49 day of age. The blood samples were collected at 35 and 49 day and weight of selected visceral organs were recorded at 49 day. The results suggested that high fat intake had no significant effect on Final Body Weight (FBW) and Feed Conversion Ratio (FCR). Numerically the FBW was higher in all groups that received high fat levels than control group. But abdominal fat deposition only in birds that was fed by additional soybean oil and tallow in 4% level was constant. The liver weight significantly decreased (p<0.01) and abdominal fat weight significantly increased (p<0.05) by elevation of fat level. Serum lipids concentrations had no significant difference in dietary treatments. Serum LDL concentration showed significant elevation from 35 to 49 day (p<0.01), whereas serum cholesterol concentration showed decline at the same times (p<0.05). With increasing of dietary fat level from 4 to 8%, serum cholesterol had showed elevation (p<0.05). Therefore, it seems that broilers are more resistant against the high dietary fat intake and they can be effectively used for nutritional and growth requirements promoting, without mortality.

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