Apparent digestibilities and growth experiments with tilapia (Oreochromis niloticus) fed soybean meal, cottonseed meal and sunflower seed meal

Abstract

Apparent digestibilities and growth experiments with tilapia (Oveochvornis niloticus)fed soybean meal, cottonseed meal and sunflower seed meal Summary Apparent digestibility and growth experiments with three oil seed by-products, soybean meal, cottonseed meal, and sunflower seed meal. werc conducted using tilapia (Oreucl~romis niloticus) with an initial average body weight of 93 f 5 g and 64 k 1 g, respectively. The diets were formulated on an isonitrogeneous and isoenergetic basis. During the experimental period the fish were fed 1% and 1.5% of their metabolic body weight (kg' *) daily in the digestibility experiment and the growth experiment. respectively. Waler temperature was maintained at 26.5 2 I T . Apparent digestibilities of the components and the diets were determined using an indirect method, i.c. with HCI-insoluble ash as an indicator. Faeces collection was carried out using a sedimentation technique.Results of the apparent digestibilities showed that the crude protein, crude fat, as well as the gross energy digestibilities of soybean meal (93.0%, 94.6%, and 77.2%, respectively), were better than those of cottonseed meal (79.4%, 83.2%, and 57.9%, respectively) and sunflower seed meal (89.8%,, 82.9%, and 49.3%. respectively). With the exception of the crude protein digestibility, nutrient and gross energy digestibilities of the cottonseed meal were found to be better than that of sunflower seed meal.Growth experiment results indicated that soybean meal diet groups had inferior growth performance and feed conversion in comparison to the fishmeal control diet or the other test diets at an inclusion level of 32% of the digestible protein. Fish fed cottonseed meal diet and sunflower seed tneal diet showed a relatively better, but not significantly different performance than did the fishmeal control diet. Supplementation diets with lysine and methionine did not enhance fish performance.

Lipídeos na Alimentação de Alevinos Revertidos de Tilápia do Nilo (Oreochromis niloticus, L.)

“…Tabela 1 -Composição percentual e química das rações experimentais com diferentes níveis de lipídeos (matéria natural) 1 (Sintayehu, 1996).…”

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“…As a result, the price of FM is constantly rising, adversely affecting the profitability of aquaculture enterprises (Sintayehu et al, 1996). This has forced the aquaculture industry to explore alternative, cheaper protein sources for use as FM replacers in aquafeeds.…”

“…The decrease in global production of FM clearly demonstrates that the sustainability of this industry will depend on the sustained supply of plant proteins for aquafeeds. Soybean meal has been the main plant protein source used in animal feeds as a replacement for FM because of its high protein content and relatively well balanced amino acid profile (Sintayehu et al, 1996). However, soybean meal has been increasingly commercialised and its use as the main protein source in fish feeds may longer be economically viable.…”

Feeds, water quality, gut morphology and digestion in Nile tilapia (Oreochromis niloticus)

“…If Nile tilapia are reared under normoxic conditions, as much as 100 % of the fish meal protein can be replaced by plant protein source without reducing the digestibility. The ADC of crude protein of SBM of Nile tilapia was 93 % (Sintayehu et al, 1996), 87.4 % (Köprücü and Özdemir, 2005) and 92.1 % (Tran-Ngoc et al, 2016b).…”