Utilization and digestibility of palm kernel and soyabean cake in experimental diets for tilapia, Oreochromis niloticus (Linnaeus) [in Nigeria].
1997
Adikwu I.A.
Palm kernel and soyabean cake were used to progressively effect complete substitution of a standard diet for tilapia, Oreochromis niloticus. Growth performance and feed utilization varied with percentage substitution levels. Mean final weights were significantly higher in fish fed the standard diet than in other groups. Mean feed conversion ratio (FCR) was significantly lower in groups fed exclusively on palmkernel cake than in the other groups. Mean protein efficiency ratio (PER) appeared to decline with increasing dietary palm kernel content. Mean apparent net protein utilization was significantly higher in groups fed on the standard diet than in other groups. In groups fed soyabean cake containing diets, growth performance and nutrient utilization generally showed significant decline with increasing dietary soyabean content. Similarly, mean apparent protein and lipid digestibility appeared to decline with increasing soyabean cake concentration. The results are discussed in context of plant protein utilization in fish and the feasibility of developing complete diets for farmed fish using plant protein sources.
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