Study On Effect Of Alfalfa Meal On Growth Performance And Mechanism Of Bluntnose Black Bream (Megalobrama Amblycepnala)

EXPERIMENT ONE: An experiment was conducted using 750 Megalobrama amblycepnala to study the effect of alfalfa meal on production performance and qulity of fish body.The carps were randomly divided into five treatments according to a random factorial arrangement, each treatment represented by three replicates of 50 carps .The carps were fed diets with 0, 100, 200, 300 and 400 g/kg alfalfa meal during the period of 39 days. The results showed that ( 1) 100 g/kg alfalfa meal in diet were superior in average individual daily weight gain and feed conversion ratio to that of no meal treatment (P<0.05), but average individual daily weight gain, relative growth rate and feed conversion rate of bluntnose black breams fed alfalfa meal at 300 g/kg and 400 g/kg in diet were significantly decreased (P<0.05) . Relative growth rate also showed that 100 g/kg alfalfa meal had more active effect on production performance than that of no meal treatment, there was no significant difference although between the two groups (P>0.05) . Bluntnose black breams added 200 g/kg alfalfa meal were inferior to that of no meal treatment,but the two groups had no significant difference either (.P>0.05). (2) The relative fatness and ratio of body length and height of group I and II were superior to that of no meal treatment, however, there was no significant difference among three groups (P>0.05) . (3) According to no meal treatment,crude protein content of muscle was improved in group I than control group,but there was no significant difference between group I and control group (P>0.05) . EE was significantly decreased whenamount of alfalfa meal was increased(P<0.05),especially for group III and IV.It showed that alfalfa meal could improve the qulity of fish body of carps. (4) Economic profit of carps fed diets with 100 g/kg alfalfa meal was best. So it was recommended that 100 g/kg was the suitable level of alfalfa meal in the diet of bluntnose black breams.EXPERIMENT TWO: An experiment was conducted using 1530 Megalobrama amblycepnala (about 60g) to study the effect of alfalfa meal on production performance, qulity of fish body, the activity of digestive enzymes and the biochemical indexes serum. The carps were randomly divided into six treatments...