Abstract
The nutritional value of a feedstuff isn’t only on its chemical composition, however, the content of the nutrients absorb by the aid of the fish. Thus, this study was developed to determine crude protein digestibility status of the five feeds (noug cake (NK), wheat bran (WB), soybean meal (SM), brewery waste (BW), and fish meal (FM) in Oreochromis niloticus. The experiment was conducted using 180 Oreochromis niloticus population with weight of 28.2 to 28.4 g, distributed in experimental randomized blocks design with five treatments and three replicates per treatment. Digestibility was estimated by the indirect method using chromic oxide at the concentration of 0.50 % of the diet as a marker. The apparent and true digestibility of the protein was estimated for noug cake, 87.1 and 89.1 %; wheat bran 74.3 and 78.7 %; soybean meal 88.3 and 90.0 %; brewery waste 65.4 and 67.8 %; fish meal 85.5 and 87.0 %, respectively in siphoning technique. Similar (P > 0.05) results were observed in striping and siphoning methods in all experimental ingredients. Soybean, noug cake and fish meal had better (P < 0.05) crude protein digestible by Oreochromis niloticus than wheat bran and brewery waste. Brewery waste was the lowest digestible by O. niloticus. The growth performance of the fish also in line with the crude protein digestibility status of the ingredient hence, the lowest growth performance was recorded in fish consumed brewery waste. This indicates, brewery waste isn’t well digestible by O. niloticus. Key words: Siphoning, striping, ingredients, digestibility, Oreochromis niloticus.
Highlights
The nutritional value of a feed is not exclusively based on its chemical composition and on the amount of nutrients that can be absorbed by the fish (Ibrahim, 2005; Patrícia, 2012)
The locally available fish feed ingredients: wheat bran, noug cake and starch were purchased from Addis Ababa, brewery waste was collected from meta brewery factory, fish meal from Bahir Dar and soybean was available in National Fisheries and Aquatic Life Research Center (NFALRC) feed store
The above machines are not available in the center and we used manual methods which are most practicing in Ethiopia for soybean ingredients used as a fish feed
Summary
The nutritional value of a feed is not exclusively based on its chemical composition and on the amount of nutrients that can be absorbed by the fish (Ibrahim, 2005; Patrícia, 2012). For the duration of fish feed system, the nutrient compositions of the feeds and the biological utilization of the nutrients in every of the inclusion ingredients for the species should be considered (Maina et al, 2002; National Research Council, 2011).
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