芙蓉鲤鲫饲料适宜蛋白质脂肪及淀粉含量生态学专业论文.docxVIP

摘要Abstract 摘要 Abstract Optimal contents of dietary protein， lipid and starch for Furong crucian carp(Cyprinus carpio var．Furong carp早×C carpio red crucian carp 8) Four growth trials were conducted to determine the effects of dietary protein，lipid and starch levels on growth and feed utilization of Furong crucian carp(Cyprinus carpio Furong carp早×C carpio red crucian carp 8)．Body composition， hematological parameters and digestive enzyme activities were also determined to investigate the mechanism for the utilmation of the nutrients by the fish． Results are showed as follows： 1．In Trial 1，fish meal and casein were used as main protein source，equal mixture of fish oil and soybean oil Was used as dietary lipid source and corrl starch was used 嬲carbohydrates to formulate seven isolipid(8％)and isoenergetic(1 7MJ／kg) experimental diets containing different protein levels(25％-43％)，which was used to feed juvenile Furong crucian carp(7．67士0．66 g)．The experimental duration was 64 days．The results showed that：with the increasing of dietary protein levels， weight gain increased with dietary protein up to 40％and then decreased(尸O．05)． Feed efficiency increased，with dietary protein and that in 37％treatment group was the highest妒O．05)．Plasma triglyceride concentration declined with dietary protein levels increased休O．05)．Plasma total cholesterol concentration had no difference between groups p0．05)．Midintestine typsin activities was significantly increased with dietary protein levels俨0．05)，while chymotrypsin activities had no significant difference between treatments(尸0．05)． Glutamic-pyruvic transaminase activities in liver decreased firstly and then raised with dietary protein levels，34％treatment group was the lowest(尸O．05)．Glutamic oxalacetic transaminase activities and hepatic glycogen content were not affected by dietary Ⅲ 万方数据 芙蓉鲤鲫饲料适宜蛋白质、脂肪及淀粉含量protein 芙蓉鲤鲫饲料适宜蛋白质、脂肪及淀粉含量 protein levels pO．05)．Broken-line of SGR estimated that protein requirements for maxmum growth was about