丙氨酰-谷氨酰胺对建鲤的适宜投喂模式

【目的】探讨丙氨酰-谷氨酰胺(Ala-Gln)对建鲤适宜的投喂模式。【方法】以初始质量(33.52±0.17)g的建鲤鱼种为研究对象,在室内单循环养殖系统中进行8周生长试验,分别配制添加0.0g/kg(对照饲料)和5.0g/kg(试验饲料)Ala-Gln的等氮(350g/kg粗蛋白)、等能(17kJ/g)饲料,采用5种不同的Ala-Gln投喂模式(Ⅰ.连续8周投喂对照饲料(对照组);Ⅱ.试验饲料2周间隔投喂;Ⅲ.前4周投喂试验饲料,后4周投喂对照饲料的4周间隔投喂;Ⅳ.前4周投喂对照饲料,后4周投喂试验饲料的4周间隔投喂;Ⅴ.8周连续投喂试验饲料),研究Ala-Gln投喂模式对建鲤生长、饲料利用和体成分的影响。【结果】Ala-Gln连续投喂和间隔投喂时,建鲤的生长性能均显著高于对照组(P0.05),2周间隔投喂组建鲤的平均增质量率和特定生长率均显著高于4周间隔和连续8周投喂组(P0.05),2组4周间隔投喂组间无显著差异(P0.05),但前4周投喂试验饲料的4周间隔投喂组建鲤的平均增质量率和特定生长率高于8周连续投喂组(P0.05),2周间隔投喂组和后4周投喂试验饲料的4周间隔投喂组建鲤的脏体比显著低于对照组(P0.05);在Ala-Gln的4种不同投喂模式下,建鲤的摄食率均显著高于对照组(P0.05),2周间隔投喂组和前4周投喂试验饲料的4周间隔投喂组建鲤的蛋白效率显著高于对照组(P0.05),2周间隔投喂组和前4周投喂试验饲料的4周间隔投喂组建鲤的饲料系数显著低于对照组和连续8周投喂组(P0.05);只有8周连续投喂组建鲤的白肌粗蛋白质含量显著高于对照组(P0.05)。【结论】在本试验条件下,饲料中添加Ala-Gln可提高建鲤的生长、饲料利用和白肌粗蛋白质含量,但不同投喂模式间有显著差异,从建鲤生长性能、饲料利用和体组成的角度,并结合经济性和适用性等进行考虑,建议采用2周间隔投喂模式或前4周投喂添加Ala-Gln饲料的4周间隔投喂模式。

Discussion on appropriate feeding modes of Ala-Gln in Cyprinus carpio var.Jian

【Objective】The research investigated the suitable feeding modes of Ala-Gln in Cyprinus carpio var.Jian.【Method】The trial was carried out on healthy C.carpio var.Jian with the initial weight(33.52±0.17) g in a controlled single recirculating system for 8 weeks.The present study was conducted to evaluate the effect of different feeding modes of Ala-Gln on growth,feed utilization and body composition of C.carpio var.Jian.Two isonitrogenous(350 g/kg crude protein)and isocaloric(17 kJ/g)diets were formulated at content rations 0.0 g/kg(control diet) and 5.0 g/kg(trail diets) of dietary dry matter,which were fed the C.carpio var.Jian in five different feeding modes(permanently fed by control diet during eight weeks(Ⅰ,control group),trail diet at an interval of two weeks(Ⅱ),trail diet before four weeks at an interval of four weeks(Ⅲ),trail diet after four weeks at an interval of four weeks(Ⅳ),permanently fed by trail diet during eight weeks(Ⅴ)).【Result】The results indicated that different feeding modes of Ala-Gln significantly influenced growth,feed utilization and body composition in C.carpio var.Jian(P<0.05).The growth of permanently and interval feeding was significantly higher than that of the control group(P<0.05);weight gain rate and specific growth rate of 2-week interval feeding were significantly higher than that of 4-week intervals and 8-week permanently feeding(P<0.05).Both of 4-week intervals feeding had no difference(P>0.05)but that of first four-week interval of four weeks was higher than that of permanently eight weeks(P<0.05).Viscerasomatic index of 2-week interval and post four-week interval was significantly lower than that of the control(P<0.05).Feeding rate of feeding modes was significantly higher than that of the control group(P<0.05).Protein efficiency of 2-week interval and first four-week interval was significantly higher than that of the control group(P<0.05),but feed coefficient was significantly lower than that of the control group and permanent 8-week(P<0.05).White muscle protein content of permanent 8-week was significantly higher than that of the control group and the other feeding(P<0.05).【Conclusion】In the present study,it is concluded that adding Ala-Gln can promote growth,feed utilization and white muscle protein content of C.carpio var.Jian.There were significant differences among feeding modes.It is suggested that 2-week or first 4-week intervals feeding modes be recommended for the culture of C.carpio var.Jian considering economical cost and practicability.