不同投喂频率对大规格鳜生长性能、生理参数及胃肠消化特征研究OA

A 60-day feeding experiment was conducted to evaluate the effects of different feeding frequencies on the growth performance,physiological indices,and digestive models of Siniperca chuatsi,with an initial weight of(33.78±2.47)g.Fish were randomly assigned to four feeding frequencies:continuous feeding,2 times/day,4 times/day,and 6 times/day.The results showed that the 4 times/day feeding group exhibited the optimal performance,with the highest final body weight,weight gain rate,specific growth rate,and sur-vival rate,and the lowest feed conversion ratio,followed by the 6 times/day feeding group,while the contin-uous feeding group performed the worst.The levels of blood glucose(Glu),triglycerides(TG),and total cho-lesterol(TC)increased significantly with increasing feeding frequency.Specifically,the continuous feeding group registered the highest levels of these parameters,whereas the 2 times/day feeding group displayed the lowest.The activities of superoxide dismutase(SOD),catalase(CAT),glutathione peroxidase(GPx),and glutathione(GSH)in the continuous feeding group and the 2 times/day feeding group were significantly higher compared to the 4 times/day and 6 times/day feeding groups.A detailed investigation into the digestive model of Siniperca chuatsi revealed that both the gastric emptying and intestinal filling-emptying processes could be accurately de-scribed by cubic functions,with approximately(4.40±0.16)h to digest 50%of the food in the stomach after a full meal and about(8.52±0.33)h to digest 90%of the food.Furthermore,the retention time of food in the in-testine was approximately(6.25±0.24)h.Results of this study suggest that a feeding frequency of 4～6 times/day should be adopted for S.chuatsi of this size.