Effect Of Diet N-carbamylglutamate On Growth Performance Of Cherry Valley Ducks

This experiment was conducted to study the effects of different dietary N-carbamylglutamate(NCG) added level on growth performance, slaughter performance, organ development, blood biochemical indexes, intestinal development and morphology of Cherry Valley Duck which aged 11 to 42 days, to investigate the applicability of NCG in the Cherry Valley duck diets. Experiment 1: Single-factor experiment was designed and the dietary metabolizable energy(ME) and crude protein(CP) levels were 11.5 MJ / kg and 16.5%, respectively. A total of 1440 healthy 11-day-old Cherry Valley ducks were randomly distributed into 6 treatments with 6 replicates of 40 birds each. The additional NCG levels were 0, 0.01%, 0.03%, 0.05%, 0.07% and 0.09%, respectively. Experiment 2: Using single-factor design, the test dietary ME level for 11.5 MJ / kg, CP level for 14.5%, 6 different dietary NCG addition levels. A total of 1440 healthy 11-day-old Cherry Valley ducks were randomly distributed into 6 treatments with 6 replicates of 40 birds each. The addition levels of NCG were 0, 0.01%, 0.03%, 0.05%, 0.07% and 0.09%, respectively.Test results showed as follows:(1) The ADFI and F/G were significantly affected by different dietary NCG addition of 42 d duck when the dietary CP level was 16.5%, and there was a highest ADFI with 0.05% NCG additional level, which significantly higher than 0, 0.07%(P < 0.05), no significant differences were observed in final mean weight and ADG(P > 0.05).(2) When the dietary CP level was 16.5%, the different NCG additional levels had a significant effect on half-eviscerated rate, breast muscle and leg muscle of 42 d ducks(P < 0.05), the pectoral muscle ratio increased with the NCG level increasing, while the slaughter rate, eviscerated yield rate and abdominal fat rate had no significant effect(P > 0.05) when compared with the control group,.(3) When the dietary CP level was 16.5%, the dietary NCG additional level significantly increased the jejunum relative weight and relative length of 42 d ducks(P < 0.05).(4) When the dietary CP level was 16.5%, the NCG additional groups had a significant effect on the duodenum, jejunum, ileum villus height, duodenal, jejunal crypt depth, villus height and crypt depth ratio and ileum muscular layer thickness of 42 d ducks(P < 0.05).(5) When the dietary CP level was 16.5%, with the increasing of dietary NCG added, the serum total protein concentration, albumin, A/G and NO had a rising trend, TNOS concentration decreased at first and then increased, i NOS was decreased gradually(P < 0.05).(6) When the dietary CP level was 14.5%, the final mean weight and ADG were significantly affected by different dietary NCG addition of 42 d ducks(P < 0.05), no significant difference was observed in ADFI and F/G(P > 0.05).(7) When the dietary CP level was 14.5%, different diet NCG additional levels had a significant impact on the leg muscle rate of 42 d ducks(P < 0.05), with the NCG additional level increasing, the thigh meat rate showed a first increased and then decreased trend, and 0.05% group was significant higher than other groups.(8) When the dietary CP level was 14.5%, there was a significant effect of dietary NCG treatments on duodenum, jejunum and ileum villus height, crypt depth, cashmere hidden ratio and the thickness of the grass-roots level of 42 d Cherry Valley Ducks(P < 0.05)(9) When the dietary CP level was 14.5%, different diet NCG additional levels greatly influenced the serum concentration of albumin and A/G(P < 0.05), with the level of NCG increasing A/G increased first and then decreased; there were significant differences on NO, TNOS and i NOS concentration between different diet NCG levels(P < 0.05), with the increasing of additional amount of NCG, TNOS concentration decreased significantly.Conclusion: Under the laboratory conditions, considering all the factors, high protein diet(CP was 16.5%) has more growth advantage than the low protein diet(CP was 14.5%).