Abstract
A feeding trial was conducted for 60 days to study the utilization of fruits processing wastes as feed ingredient in the diet of Labeo rohita fingerlings. One hundred and sixty fingerlings (av. body weight, 1.65 g±0.03) were equally distributed in four experimental groups having 4 replicates each. Four different experimental diets were prepared by replacing wheat flour and rice bran with either orange (T2) (Cirtus qurantium), pineapple (T3) (Ananas spp. and Pseudananas spp.) or sweet lime (T4) (Citrus sinensis) wastes to the basal diet along with the control (T1, without any fruit wastes) keeping the CP level at around 40%. The water quality parameters like DO, CO2, pH, total alkalinity, total hardness, ammonia and water temperature were recorded within the optimum range. The diet containing 25% pineapple wastes (T3) showed significantly higher growth in terms of SGR (1.50), FCR (2.09) and PER (1.19) than the other groups. However, growth of T4 and T2 groups were not significantly different than the control group (T1). Protease activity (17.17 unit/mg protein), protein digestibility (91.57%) and carbohydrate digestibility (41.62%) were not significantly different among the different groups. Survival of the fingerlings were not significantly different among the experimental groups. It concludes that waste of orange, pineapple and sweet lime can be used at 25% level as a substitute of wheat flour and rice bran in the diet of Labeo rohita. (Asian-Aust. J. Anim. Sci. 2003. Vol 16, No. 11 : 1661-1665)
Highlights
Carps are the commercially cultured fresh water fishes in Asia
Though no literature is available in this regard, it may correlate with the presence of a proteolytic enzyme ‘bromelain’ in pineapple, which might be the factor for better utilization of protein (Murachi and Takahashi, 1970)
From the above experiment it may conclude that vast amount of fruit processing wastes available have the potential to be used as a source of energy by replacing conventional ingredients like rice bran and wheat flour
Summary
Carps are the commercially cultured fresh water fishes in Asia. In India Catla catla (Ham Buch), Labeo rohita (Ham.) and Cirrhinus mrigala (Ham.) are highly preferred fishes. In India, over 35 million tones of fruits and vegetables are processed annually and this resulted in about 10 million tones of wastes (Maheswari et al, 1984). This wastes from fruit processing operation constitutes a large untapped source of energy and proteins. Most of these wastes are merely dump in fields, which causes pollution. Possible uses of these wastes in animal feed preparation have been suggested by some workers (Patel et al, 1972). Very little emphasis has been given to the use of this fruit-processing wastes, which is very cheap and available, but somewhat high in fibre
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