长吻和异育银鲫对玉米淀粉利用差异的比较研究
COMPARATIVE STUDY ON THE EFFECT OF DlETARY CORN STARCH CONTENT ON GROWTH, FEED UTILIZATION AND BODY COMPOSITION OF CHINESE LONGSNOUT CATFISH( LEIOCASSIS LONGIROSTRIS GBNTHER)AND GIBEL CARP( CARASSIUS AU RATUS GIBELIO)
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摘要: 在同一实验条件下,通过8周生长实验比较研究了不同玉米淀粉含量的饲料对长吻和异育银鲫生长、饲料利用和鱼体组成的影响,以探讨肉食性和杂食性鱼类对玉米淀粉利用的差异。长吻的实验饲料是5种等氮等脂、玉米淀粉含量分别为0、5%、10%、15%和20%的半精制饲料。异育银鲫的实验饲料是5种等氮等脂、玉米淀粉含量分别为6%、12%、18%、24%和30%的半精制饲料。每天饱食投喂鱼两次。实验结果表明:对于长吻,玉米淀粉含量为5%和10%饲料组的特定生长率显著高于另外3组(Duncan s多重比较,P0.05)。但各组间的饲料效率、摄食率、蛋白贮积率都没有显著差异(Duncan s多重比较,P0.05)。当饲料中的玉米淀粉含量从6%增加到24%时,异育银鲫的特定生长率也随之增加,而摄食率不断下降。玉米淀粉含量24%饲料组的饲料效率显著高于其他各组(Duncan’s多重比较,P0.05)。长吻和异育银鲫鱼体粗脂肪的含量都随着饲料中玉米淀粉含量的增加而增加。在本实验中,长吻和异育银鲫饲料中的适宜无氮浸出物含量分别为7.66%和15.62%。Abstract: Two 8-week growth trials were conducted under similar experimental conditions to study the difference in the dietary carbohydrate utilization for carnivorous and ominivorous fishes by investigating the effect of dietary corn starch content on growth performance of Chinese longsnout catfish(Leiocassis longirostris GÜnther) and gibel carp(Carassius auratus gibelio).Five isonitrogenous and isolipidic diets containing different corn starch content(0, 5%, 10%, 15%, 20% ) were prepared for Chinese longsnout catfish while five isonitrogenous and isolipidic diets containing different corn starch contents(6%, 12%, 18%, 24%, 30% ) for gibel carp1Each diet was fed to triplicatetanks of fish(12 Chinese longsnout catfish per tank,average initial body weight 8.3g;20 gibel carp per tank, average body weight 9.0g) to apparent satiation twice a day1The results showed that, for Chinese longsnout catfish, specific growth rate(SGR) of the fish fed diets containing 5% and 10% dietary corn starch were significantly higher than those of the other three groups(P0.05)1For gibel carp,SGR increased with the increase in dietary corn starch content from 6% to 24% whileFI decreased1FCE of fish fed diet containing 24% corn starchwas significantly higher than those of other groups(P<0.05) 1Body lipid contents of two fishes increased with the increase in dietary corn starch content1In conclusion,the optimal dietary nitrogen-free extraction level for Chinese longsnout catfish and gibel carp was 7.66% and 15.62%,respectively1Gibel carp showed better utilization of corn starch than Chinese longsnout catfish does
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Keywords:
- Chineselongsnoutcatfish /
- Gibelcarp /
- Cornstarch
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