Effects of different durations of fasting/re-feeding bouts on growth, biochemical and histological changes in the digestive tract of Gansu golden trout (Oncorhynchus mykiss)

Xia Liu, Ibrahim Magdy Mohamed Hegab, Junhu Su, Xiaohua Du, Xiping Fan, Qiong Zhang, Yuan Gao and Haifang Wang
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Xia Liu: College of Life Science and Technology, Gansu Agricultural University, Lanzhou, P.R. China
Ibrahim Magdy Mohamed Hegab: Department of Hygiene, Zoonosis and Animal Behaviour and Management, Faculty of Veterinary Medicine, Suez Canal University, Ismailia, Egypt
Junhu Su: College of Grassland, Gansu Agricultural University, Lanzhou, P.R. China
Xiaohua Du: Faculty of Veterinary Medicine, Gansu Agricultural University, Lanzhou, P.R. China
Xiping Fan: Faculty of Veterinary Medicine, Gansu Agricultural University, Lanzhou, P.R. China
Qiong Zhang: College of Life Science and Technology, Gansu Agricultural University, Lanzhou, P.R. China
Yuan Gao: College of Life Science and Technology, Gansu Agricultural University, Lanzhou, P.R. China
Haifang Wang: College of Life Science and Technology, Gansu Agricultural University, Lanzhou, P.R. China

Czech Journal of Animal Science, 2018, vol. 63, issue 10, 389-398

Abstract: This study was conducted to explore the outcomes of starvation/re-feeding techniques on growth performance, liver antioxidant activities, and histological changes of the gastrointestinal organs of Gansu golden trout. A total of 225 juveniles were divided into 5 treatment groups; the control group (N0) was routinely fed every day while the other groups (N7, N14, N21, and N28) were starved for 7, 14, 21, and 28 days, respectively and after the starvation session, each group was re-fed for 28 days. Compensatory growth was statistically recorded in N14. Weight gain rate and feeding ratio were the highest in the N14 group, while specific growth rate and feeding conversion ratio showed significant increases in the fish groups exposed to longer starvation periods. Liver antioxidant activities showed a significant increase and decrease in malondialdehyde and superoxide dismutase levels in N21 and N28, respectively, which returned to normal levels after re-feeding. Stomach, intestine, and liver showed histological alterations in all groups and the severity was correlated with the fasting periods. Those changes were restored to a certain degree after feeding was resumed. The compensation by group N14 presents potential for economic usefulness of the fasting/re-feeding strategy in Gansu golden trout.

Keywords: biochemistry; food deprivation; phenotypic changes; histology; productive traits (search for similar items in EconPapers)
Date: 2018
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