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The effects of raw versus pre-treated carob seed germ meal (CSGM) were investigated on the digestibility, growth performance and feed utilisation in red tilapia. For digestibility, a reference diet was compared with raw CSGM, soaked or autoclaved CSGM. In the growth trial, six experimental diets were formulated: Diet 1 CSGM free; Diets 2% pre-treated CSGM; Diet 6 contained 40 % untreated CGSM. Raw CSGM had significantly lower nutrient digestibility in tilapia compared to treated CSGM. This was reflected in significantly better growth in fish fed Diets 2–5 compared to raw CSGM diet. Body lipid significantly reduced while body moisture significantly increased when fish were fed diets containing 40 % CSGM. Muscle cholesterol, plasma cholesterol, and plasma triglycerides were significantly higher in fish fed Diet 1 while plasma phosphate was significantly lower in fish fed Diet 6. Pre-treating CSGM reduced tannins, phytic acid, saponins and trypsin inhibitors, which likely contributed to significantly better growth performance. However, this was not sufficient to improve growth to a similar level as fish fed Diet 1. This could be linked to the pretreatments having a limited effect on non-starch polysaccharides of CSGM and ways to reduce these compounds should be explored. |
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