Cottonseed Oilcake as a Protein Source in Feeds for Juvenile Tilapia (Oreochromis niloticus): Antinutritional Effects and Potential Detoxification by Iron Supplementation

Meric, I., Wuertz, S., Kloas, W., Wibbelt, G. and Schulz, C. (2011) Cottonseed Oilcake as a Protein Source in Feeds for Juvenile Tilapia (Oreochromis niloticus): Antinutritional Effects and Potential Detoxification by Iron Supplementation Israeli Journal of Aquaculture-Bamidgeh, 63 . DOI 588.

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Abstract

Crude cottonseed oilcake, a protein-rich by-product of cottonseed oil production, was used to replace fishmeal in diets for juvenile tilapia (Oreochromis niloticus). Crude cottonseed oilcake was included in the diets at levels of 0 (control), 15, 30, and 45, as an alternative protein source. The impact of the main antinutritional component of cottonseed oilcake, gossypol, on growth and its chronic adverse effects on blood hematocrit and tissue histology were assessed and compared with the documented effects of cottonseed meal. The detoxifying effect of iron (Fe) on gossypol was evaluated in the diets containing 30 and 45 cottonseed oilcake, which were supplemented with ferrous sulfate heptahydrate. As the rate of oilcake rose, the specific growth rate and protein efficiency ratio slightly, but significantly, dropped. Ferrous supplementation compensated for this effect in the 30 diet, but not in the 45 diet. However, iron supplementation led to mild inflammation in the intestine (infiltration of neutrophilic granulocytes), fatty degeneration of the liver, and a lower hepatosomatic index. Nevertheless, due to the beneficial effect on growth, iron supplementation is critical. No histopathological effects of the dietary cottonseed oilcake were observed in the gills, gonads, or heart. In conclusion, the effects of cottonseed oilcake supplementation were moderate when compared to the effects of cottonseed meal and a replacement level of 15-30 is recommended to obtain non-detectable effects.

Document Type: Article
Keywords: tilapia cottonseed iron fishmeal gossypol cottonseed growth histology sublethal chronic trout oncorhynchus-mykiss rainbow-trout body-composition immune-response nile tilapia fed diets gossypol meal growth performance
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence > FO-R04
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
DOI etc.: 588
ISSN: 0792-156X
Projects: Future Ocean
Date Deposited: 01 Nov 2012 05:01
Last Modified: 03 Apr 2017 10:16
URI: http://eprints.uni-kiel.de/id/eprint/18086

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