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Effects of N-carbamylglutamate supplementation on performance and immune function of Beijing duck

ZHANG Jie;ZHANG Xiaohe;CAO Yun;LI Xinhua;AI Juntao;LI Yuqing;YU Fengzhi;Beijing Vocational College of Agriculture;Beijing Animore Sci.&Tech.Co.,Ltd;  
To evaluate the effects of N-carbamylglutamate(NCG) on performance and immune function of Beijing ducks,996 one day old ducklings were randomly allocated to 4 groups(3 replicates per group,83 per replicate).Based on the standard feed consumption per day,0.016%,0.018% and 0.020% of NCG were weighed and dissolved in water for drinking,and trial lasted for 40 days. Results showed that addition of NCG increased average body weight gain over 8% in 1 ~ 10 day ducklings(P 0.05). And ratio of feed intake to body weight gain decreased of 19.76% with 0.016% supplementation of NCG(P 0.05). Moreover,with 0.016% and0.020 % NCG supplementation,spleen index and thymus index increase of 39.49% and 41.25% respectively(P 0.05);plasma IgG content increased of 33.08% and C4 content declined of 37.60% with 0.018% NCG supplementation(P 0.05);with 0.020% NCG supplementation, plasma IgG content rose of 75.96 %(P 0.05).On 11 ~ 40 d old ducks with 0.016% and 0.020% NCG supplementation, thymus index increased of80.45% and 102.36% respectively(P 0.05);plasma IgA increased of 80.45% and 102.36%(P 0.05);plasma C4 content decreased of 41.52% and 53.08%(P 0.05)severally. In conclusion,addition of NCG significantly improved performance of Beijing duck on 1 ~ 10 d and promoted development of immune organs to benefit immunity. 0.016% supplementation of NCG was appropriate for Beijing duck.
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