Dietary plant protein utilization in Atlantic cod, Gadus morhua L.
Aquaculture Nutrition, ISSN: 1353-5773, Vol: 13, Issue: 3, Page: 200-215
2007
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Article Description
The present trials aimed to investigate the effects of replacing fish meal with plant proteins in diets for cod, using a regression design where fish meal constituted the control. The plant protein diets were formulated to meet the amino acid requirements according to NRC (1993) and contained corn gluten meal, soybean meal, a mixture of these, or a mixture of wheat gluten meal and soybean concentrate. The plant protein fraction constituted up to 440 g kg of the extruded diet. Two feeding experiments were conducted, one at high (11 °C) and one at low (6.5 °C) temperature. High growth and feed utilization were obtained in all diet groups at both temperatures. However, only in Exp.1 (11 °C), growth and feed utilization were linearly reduced by increases in dietary soybean and corn gluten meal, while no such effect was detected in Exp.2 (6.5 °C). Reductions in protein retention were seen at both temperatures with use of all evaluated plant protein sources. Due to large amounts of plant protein ingredients in diet, differences in diet amino acid composition were seen. These were partly reflected in the muscle free amino acid pool. Dietary plant ingredients did not affect whole body, liver or muscle proximate compositions, or liver indices. In both experiments, blood parameters were within the range of earlier reported normal values and indicated, together with low mortality, good fish health status. The results show that there is high potential to use protein-rich plant ingredients in diets for Atlantic cod. © 2007 Blackwell Publishing Ltd.
Bibliographic Details
Hindawi Limited
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