Influence of Dietary Energy Level on Stomach Emptying and Appetite Revival Rates in Rainbow Trout, Oncorhynchus mykiss

Authors : Ahmet Adem TEKİNAY*

Pages : 1077-1084

View : 16 | Download : 3

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :D1, D2 and D3 diets containing 15.5, 12.5 and 9.0 MJ kg-1 digestible energy concentrations were offered to rainbow trout insert ignore into journalissuearticles values(Oncorhynchus mykiss Walbaum, 1792);, and the rates of gastric evacuation and feed intake were determined. Gastric evacuation determinations were achieved by slaughtering eight fish every 6 h until no residue was found in the cardiac stomach. Return of appetite experiments were conducted by re-feeding groups of trout every 6 h following the first feeding. The data provided from each process was modelled by regression analysis and compared statistically. Square root equations best explained the gastric evacuation data, whereas first-order models were used for the description of return of appetite. The gastric emptying slope of D1 was found to be different insert ignore into journalissuearticles values(P < 0.05); to the other two treatments, whilst no significance insert ignore into journalissuearticles values(P > 0.05); was apparent between the slopes of D2 and D3. Similarly, the return of appetite slope of D1 was significantly different insert ignore into journalissuearticles values(P < 0.05); to the slopes of D2 and D3, although no noticeable difference insert ignore into journalissuearticles values(P > 0.05); was evident between the return of appetite slopes of D2 and D3. A close relationship between appetite revival and gastric evacuation rates in rainbow trout was established.
Keywords : Feed intake, low energy diets, gastric evacuation, return of appetite, rainbow trout, Oncorhynchus mykiss