Performance of Dried Distillery Grain Waste on the Growth and Survival of Rohu (Labeo rohita) Larvae
Performance of Dried Distillery Grain Waste on the Growth and Survival of Rohu (Labeo rohita) Larvae
Padala Dharmakar1*, S. Aanand1, J. Stephen Sampath Kumar2, Muralidhar P. Ande3, P. Padmavathy4, J. Jaculine Pereira4 and Ch. Balakrishna5
ABSTRACT
Fish meals followed by oil cakes are the primary protein sources in any aquafeed formulation. The higher-cost of oil cakes and uncertainty in the fish meal (FM) availability led to the search for good quality alternative feed ingredients. By-product protein sources are cheaper and readily available to substitute the expensive ingredients in traditional feed production. The present study was carried out to investigate the performance of dried distiller’s grain waste (DDGW) by partial replacement of groundnut oil cake (GNOC) on the growth and survival of Labeo rohita in the nursery phase. Three isonitrogenous diets incorporating DDGW at (T1) 30%, (T2) 40% and (T3) 50% kg/feed replacement of GNOC were used as test diets with and diets only GNOC was taken as the control (C). The experimental trial was conducted in duplicate groups of 3000 rohu juvenile (mean initial weight 0.04±0.03 g) and was fed with the diets for 60 days. The growth performance and feed utilization parameters, viz., weight gain % (WG), specific growth rate (SGR), protein efficiency ratio (PER) and feed conversion ratio (FCR), were recorded. The fishes’ whole body proximate composition and amino acid profiles were not significantly different among experimental diets. The results revealed that dietary DDGW @50% replacement of GNOC had shown the higher final weight and specific growth rate. Feed conversion and protein efficiency rates were similar among the dietary treatments. The digestive enzyme activity remained unaffected except for amylase activity, which increased significantly in the 50% DDGW replacement group. The present study indicates that DDGW can replace GNOC without affecting feed utilization parameters for better growth performance and digestive enzyme activity in the diet of L. rohita.
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