Dietary vitamin E requirement of sunshine bass (Morone chrysops [] x M. saxatilis []) and apparent lack of interactions between vitamin E and selenium
Abstract
A 12-week feeding trial was conducted to determine the dietary vitamin E requirement of juvenile sunshine bass (Morone chrysops @ x M saxatilis d), and to investigate the possible interactions between dietary vitamin E and selenium. Sunshine bass initially averaging 1.8 ︢0.08 g (mean ︢s.d.) were fed semi-purified diets supplemented with 0. 2 mg S e/kg from Na2SeO3and either 0 (basal), 10, 20, 40, 60, or 80 mg vitamin E/kg as dl-(x-tocopheryl acetate. Fish fed the basal diet, which contained 5.8mg (x-tocopherol/kg dry weight, were darker in color and had reduced hematocrit values but did not exhibit reduced survival. Diets containing the lowest levels of vitamin E caused significantly (P<0.05) reduced weight gain and feed efficiency of fish compared to those fed diets supplemented with vitamin E at 20 to 80 mg/kg. Dietary supplementation of vitamin E caused incremental increases in the concentration of cc-tocopherol in both plasma and liver tissues. Regression analysis of weight gain data using the broken-line model indicated a dietary vitamin E requirement of 28 mg/kg dry diet. Two additional semi-purified diets containing either 0 or 60 mg vitamin E/kg without supplemental selenium also were included in the feeding trial and provided a 2 x 2 factorial arrangement to evaluate potential interactions between selenium and vitamin E. At the end of the 12week feeding trial, sunshine bass fed diets without supplemental vitamin E had significantly reduced weight gain and feed efficiency but selenium supplementation did not influence these responses. Dietary vitamin E and selenium also did not have significant effects on hematocrit of sunshine bass. Dietary vitamin E had a significant effect on plasma glutathione peroxidase (GSH-Px) activitv which was generally reduced at higher levels of vitamin E intake; however, dietary selenium had no significant effect on liver and plasma GSH-PX activity. Based on the results of this study, a dietary selenium deficiency was not induced and there were no interactions between dietary vitamin E and selenium in the nutrition of juvenile sunshine bass.
Description
Due to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to digital@library.tamu.edu, referencing the URI of the item.Includes bibliographical references: p. 23-29.
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Citation
Kocabas, Arif Murat (1996). Dietary vitamin E requirement of sunshine bass (Morone chrysops [] x M. saxatilis []) and apparent lack of interactions between vitamin E and selenium. Master's thesis, Texas A&M University. Available electronically from https : / /hdl .handle .net /1969 .1 /ETD -TAMU -1996 -THESIS -K65.