Study On The Nutritional Value Of Bloodmeal Under Different Processing Methods In The Diets Of Common Carp, Cprinus Carpio L.

Nutritional values of different blood meal were studied by nutrients analysis, in vivodigestibility determination and 2 growth experiments on common carp (Cyprinus carpio L.). Fourblood meal were prepared in different processing way as spray-dried (SDBM), solar-baked (SBBM)and extruded after solar-baked at 160℃～170℃,175℃～180℃(EBMâ… and EBMâ…¡), respectively.Besides, a spray-dried corpuscle meal (SDCM) was compared. The abstracts of 4 experiments weresummarized as following:Experiment 1. Effect of different processing methods on nutrients contentsof blood mealNutrients contents, including dry matter, crude protein, crude lipid, gross energy andamino acids profiles of 5 test blood meals and 1 Peru fishmeal were analysed according to themethod of AOAC (1990). The results showed that crude protein contents and gross energy of 5 bloodmeals were 87.81%～94.85% and 21～22MJ/kg, respectively. Crude lipid content of SDBM ishigher than other 4 blood meals, Amino acids profile of 5 blood meals is similar, but extrusion willreduce lysine some extent. Comparing with FM, amino acid profile of blood meals was unbalanced,which lacks Met and Ile. but abounding in Lys,Phe,Val,His and Leu.Experiment 2. Apparent digestibility coefficients of fishmeal and 5different processing blood meals in diets of common carp,Cyprinus carpio L.Apparent digestibility coefficients (ADCs) of dry matter (ADC_d), crude protein(ADC_p),gross energy (ADCe) and seventeen amino acids in fishmeal and 5 bloodmeals were determined indiets of common carp Cyprinus carpio L.. Each test diet was composed of 70% reference diet and30% test ingredient, in which 0.5% of C_r2O₃ (inert marker)was added, mixed with mineral premix. Ain vivo digestibility experiment were design with four replicates per treatmentin recirculating systemat 23±1℃for 28d. SBBM showed highest ADC_d as 82.65%, which significantly higher than that ofother groups. ADC_p and ADC_e of FM, SBBM, SDBM and SDCM were significantly higher than thetwo extruded blood meal.. Lower ADC_p of EBMâ… and EBMâ…¡were induced by lower amino acidsdigestibility. Experiment 3. Compare study of fishmeal and 5 blood meal on growth, bodycomposition, haematological parameters and Anti-ammonia stressability on common carp, Cyprinus carpio L.The objectives of the experiment were to compare the effects of FM and 5 bloodmeal ongrowth, body composition, haematological parameters and Anti-ammonia stress ability on commoncarp, Cyprinus carpio L. with initial body weight 30±1g. A reference diet were designed as 32% ofcrude protein, and 6 test ingredients supplied more 4% and 8% protein to other 12 test, respectively.Five replicates were designed for each diet, and the trial were lasted for 60d in a recirculating systemat 23±1℃.The results showed that the fish fed the 12 test diets were showed significantly higher growthperformance than that of reference diet group because of the higher protein level. Under thecondition of same protein level, the experimental fish of SDBM, SDCM, FM and SBBM did notshow significant difference, but remarkably higher than the fish of EBM groups. Higher protein levelwill induce significantly higher growth performance of common carp.There was no significantdifference in GSI, HSI and VSI(p＞0.05). The body composition, heamatological index and theanti-ammonia stress abilities of the common carp were also studied in this experiment and there wereno significant differences (p＞0.05).Experiment 4. Effect of feeding frequency and amino acid balance with differentmethionine sources on growth performance of blood mealA 60-day experiment was conducted to evaluate the effect of Effect of feeding frequencyand amino acid balance with different methionine sources on growth performance of common carp(Cyprinus carpio L, initial body weight, 30±1g).Three diets were designed, in which, the controldiet is formulated as SDBM8 of experiment 3, and the others 2 diets were additionally offered 0.2%crystalline met (CM) and 0.2% microcoated-Met (MM), respectively. The results showed that bothfeeding frequency and Met sources showed significant influence on growth performances ofcommon carp (p＜0.05), but the interaction of the 2 factor were not significant(p＞0.05).=There wasno significant difference in HSI, VSI, GSI of the fish (p＞0.05); Met sources had no significantinfluence on Heamatological index except Urea. However, feeding frequency had significanteffectson serum GLU,Urea ALT,AST and Chol and blood Hb content(p＜0.05).The results indicatedthat adding CM in bloodmeal used diet fet 7 times per day will significantly increase growthperformance of common carp.