| In China, ammonia emissions are predominantly produced by the agricultural sector and a number of the total emission occurs as a result of poultry production. With intensive degree of poultry farms increased, the conflicts between some environmental concerns given rise to by them and environmental protection will become acute. Current management systems and production levels for poultry industry result in most nitrogen losses. Uric acid is the main N components in poultry N metabolite and manure. Most of the loss occurs through the rapid hydrolysis of urinary nitrogen to ammonia by microbial uricoxidase and urease that present in intestinal tract and excretion of poultry. So this research was conducted to study the effect of Comphor Family Plant Extract in diet on nitrogen metabolism in broilers and ammonia losses in excretion.Three hundred sixty Arbor Acres commercial broilers were allotted to four treatment groups, each treatment with three replications and each replication with thirty broilers. The broilers were kept on iron net and feeding trail dietary lasted forty-two days. The groups received the same basal corn-bean diet, supplemented with 150mg/kgCTE (2%), 250mg/kgCTE (2%), 350mg/kgCTE (2%) and control respectively. In feeding trail, the broilers were allowed to ingest dietary and drink freely and also given light for twenty-four hours. The experimental diets were formulated according to broiler nutrients requirements proposed by NRC (1994). On 0-21 days and 21-42days, the excreta samples of broilers arecollected for studying urease activity, the concentration of TN, UA .UN and AN. At the end of trail, six chicks were picked out from the groups on the base of similar live weight and were bled to collect serum samples and intestinal samples for laboratory analysis.In the experiment the additives affected the performance of broilers. Compared to control, the average final weight and the average day gain (ADG) of 350mg/kg treatment was increased by 17.85% (P<0.05) ; 21.18 %( P<0.05). Feed: Gain (F/G) of 350mg/kg treatment was decreased by 7.54 %( P<0.05). The survive ratio was improved. It was found that the excreta urease activity was inhibited of 350mg/kg treatment by 23.5 %( P<0.05) in 21-42 days, but no effect was found in 0-21 days. It was also found that the concentration of TN. UA. UN and AN in broilers excreta were decreased in Oh time in two phase. Compared to control, the concentration of TN of 250mg/kg was decreased by 8.64% (P<0.05) ; the concentration of UA of 250mg/kg were decreased by 40.7% ( P<0.05 ) in second phase, but no effect in first phase. The concentration of UN of 350mg/kg were decreased 66.2% (P<0.05 ), 64.6% (P<0.05) and AN of 350mg/kg were 25.8% (P<0.05) . 29.73% (P<0.05) in two phases . It was also found that the emission of TN. UA, UN and AN in the experimental broilers excreta were slowed significantly in 12-96h time phase. We found that compared to control, the concentration of TP in serum of 350mg/kg was increased by 19.8% (P<0.05) and the concentration of SUA, SUN of 350mg/kg were decreased by 64.0% (P<0.05) ,25.8% (P<0.05) . And the concentration of UAAJN in intestinal contests of 350mg/kg was decrease by 41.3%(P<0.05),35.24%(P<0.05). From these results, we conclude that CT?in diet can affect nitrogen metabolism in broilers and ammonia losses profitably.
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