丙氨酰-谷氨酰胺对不同养殖密度建鲤生长和饲料利用的影响

Effects of Ala-Gln on Growth and Feed Intake of Cyprinus carpio var.jian Reared at Different Stocking Densities

以建鲤鱼种(10.07±0.15)g为研究对象,分别配成添加0、0.30%、0.60%、0.90%和1.20%丙氨酰-谷氨酰胺(Ala-Gln)的等氮等能(350 g/kg粗蛋白、17 kJ/g)饲料,各饲喂3个养殖密度(20、40和80 g/L)的建鲤8周,探讨Ala-Gln对不同养殖密度建鲤生长和饲料利用的影响.结果表明,随着养殖密度的提高,饲料利用率、蛋白质生产率都显著下降,生长离散程度加大(P<0.05).Ala-Gln在一定范围内添加,可提高建鲤对饲料摄食率和蛋白质生产率(P<0.05),降低高密度养殖所造成的生长离散程度,从而促进建鲤的生长.在该试验条件下,20、40和80 g/L养殖密度建鲤的Ala-Gln的适宜需要量分别为0.30%～0.60%、0.60%～0.88%和0.90%～1.08%.

Isonitrogen(350 g/kg CP) and isoenergetic(17 kJ/g) feed were formulated at five Ala-Gln levels(0,0.30%,0.60%,0.90% and 1.20%).Cyprinus carpio var.jian(10.07±0.15)g of three stocking density(20,40 and 80 g/L)were respectively fed with feed of five Ala-Gln levels.Effects of Ala-Gln on growth and feed intake of C.carpio var.jian reared at different stocking densities were investigated.Results indicated that feed intake and protein productive ratio were significantly lower with the increase of stocking density,but coefficient of mass variation was higher(P<0.05).In a certain range of Ala-Gln,growth of C.carpio var.jian improved with the increase of feed intake and protein productive ratio and the decrease of coefficient of mass variation(P<0.05).Under the current conditions,it could be concluded that optimum Ala-Gln level for C.carpio var.jian in the stocking densities of 20,40 and 80 g/L should respectively be 0.30%-0.60%,0.60%-0.88% and 0.90%-1.08%.