The effect of arginine on intestinal development and dietary protein utilization efficiency of Plectropomus leopardus
T he purpose of this experiment was to investigate the effects of different levels of dietary arginine on growth performance,body composition,intestinal and liver tissue development in Plectropomus leopardus[initial body weight(9.30±0.02)g].In the basal diet,five feeds with isonitrogen and isolipidic(54%crude protein,9%crude lipid)were made with arginine levels 2.4%(Arg2.4,control group),2.9%(Arg2.9 group),3.4%(Arg3.4 group),3.9%(Arg3.9 group)and 4.4%(Arg4.4 group),respectively.After eight weeks feeding trial,compared with the control group,protein efficiency and protein deposition rate increased by 9.88%,7.41%,5.56%and 17.33%,12.68%,11.99%in the Arg3.4,Arg3.9 and Arg4.4 groups,respectively(P<0.05).Weight gain rate increased by 32.03%,20.26%and 17.48%in the Arg3.4,Arg3.9 and Arg4.4 groups,respectively,compared with the control group(P<0.05).Compared with the control group,the crude protein content of the Arg2.9 and Arg3.4 groups increased by 1.62%and 1.87%,respectively(P<0.05).There was no significant effect of dietary arginine levels on the moisture content of the fish and the total amount of flavor amino acids in the muscle in each group(P>0.05).Compared with the control group,condition factor increased by 8.70%and 8.21%in the Arg3.4 and Arg3.9 groups,respectively(P<0.05).No significant effect of dietary arginine was found among the groups on hepatopancreas index,viscerosomatic index,liver vacuolization area,intestinal villus width and intestinal wall thickness(P>0.05).Compared with the control group,the length of intestinal villi and depth of crypts increased by 16.33%,20.13%,17.66%and 124.36%,138.09%,110.43%in the Arg2.9,Arg3.4 and Arg3.9 groups,respectively(P<0.05).Based on protein efficiency ratio,the suitable dietary arginine level of leopard coral trout was 3.52%.In conclusion,arginine could effectively improve the development of intestinal tissues and promote fish utilization of dietary proteins.
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