الفهرس 
IMPACT OF ADDING CITRIC ACID, SYMBIOTIC AND ORGANIC ZINC AS ANTI-GLYCATION AGENTS ON PROTEIN UTILIZATION IN BROILER DIETS
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Abstract
The present study was conducted to determine the best level of crude protein and the best anti-glycation agent by feed additives to achieve optimum broiler performance and minimize the production cost. The experimental diets included the protein levels of either 100% (optimal level) or 90% (low level) of the requirements and feed additives including citric acid (2%), symbiotic (0.1%), and zinc-methionine (0.05%). The experimental diets were formulated to meet the nutritional recommendations according to Cobb 500 guide except for CP in low protein diets. Birds were distributed into 8 treatments of 40 birds each in 4 replicates (10 birds/replicate). Results showed that diets contain optimal protein level was significantly (P<0.05) improved live body weight and body weight gain, feed conversion ratio, carcass %, abdominal fat%, intestinal morphology, glycation markers, and economic efficiency. Citric acid and symbiotic addition resulted in better body weight gain and feed conversion ratio than those fed either free diets or zinc-methionine diets. All tested feed additives reduced abdominal fat%, villus height, cecal microbial count, albumin, glycated hemoglobin Ac1, fructosamine, glycated albumin, and N- carboxymethyl-lysine. Broiler chickens fed a low protein diet supplemented with citric acid and symbiotic addition had the same performance as the control group. It could be concluded that adding citric acid and symbiotic removed the adverse effects of low dietary protein on broiler performance