jzs-10708

Impact of high dietary carbohydrates on feed evacuation of common carp (Cyprinus carpio L.)

Rabar Mahmoud Rasheed1 & Nadir Abed Salman2

1College of Agricultural Sciences, Sulaimani University, Bakrajo Street, Sulaimaniyah-Iraq

2Mazaya University College, Baladiat Street, Dhi Qar-Iraq

Abstract

A total of 120 young common carp (Cyprinus carpio L.) ranging in weight from 25 g to 39 g were used to study the effect of feeding high carbohydrate diets on feed evacuation. Fish were fed at the rate of 3% body weight on three rations, standard ration SR (37%), and medium carbohydrate ration MCR (42%) and high carbohydrate ration HCR (53%) for 70 days in oval plastic tanks using 4 replicates for each treatment. Pellets enriched with 2% iron powder as a marker were used for additional 21 days for X-ray tracing. Pre-prandial starvation for one day was adopted before feeding the experimental diets and X–raying the fish at six intervals (1, 4, 8, 12, 24 and 48 h) after feeding to estimate the evacuation rate and time. Results showed that  high carbohydrate ration was evacuated faster than MCR and SR ration. After 24 hours of feeding, 91 % of the HCR ration was evacuated compared with 84 and 79 % in both SR and MCR ration. Differences between HCR and the other two rations were significant (P<0.05).The rate of evacuating HCR ration ranged between 6.7 -7.6 % per hour compared with 5.5 -6.3% per hour for MCR and 5.7-7 % per hour for SR ration.  The theoretical evacuation time of HCR reached 26 h. compared with 30-31 h for the MCR and SR rations respectively. The results were discussed in term of the role of inert and indigestible fibrous materials which can accelerate the passage of food in fish alimentary canal. The validity of the radiographic method for estimating the rate of evacuation in omnivores carp was also evaluated.

Key Words: High carbohydrate Feed evacuation Common carp


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