Use of dried layer waste in diets for hybrid Clarias catfish (Clarias macrocephalus x C. gariepinus)
1995
Jantrarotai, W. | Boonmun, C.
Feasibility of using dried layer waste (DLW) to partially substitute conventional feedstuffs in formulated diets was determined for hybrid Clarias catfish (C. macrocephalus x C. gariepinus). Four isonitrogenous (30 percent protein) experimental diets were formulated to contain DLW at an inclusion level of 0, 12, 24 and 36 percent. Each diet was fed to apparent satiation to three replicates of fish (2-3 g) stocked in 200-L fiberglass tanks with flow-through water and air supply for 10 weeks. The results showed that the growth rate of fish decreased when fed diets with increasing amounts of DLW. However, no significantly differences in weight gain were observed in the fish fed diets containing DLW up to 24 percent. Feed conversion ratio and protein efficiency ratio were poorest for the fish fed diet with 36 percent DLW, while those of fish fed other diets did not differ (P0.05). There were no differences for apparent net protein retention in all treatments however, apparent net energy retention of fish fed diets with 36 percent DLW were significantly lower (P0.05) than that of fish fed diet with no DLW. Body compositions of from each dietary treatment were not significantly different except for body lipid which tended to decreased as increasing DLW in significantly different except for body lipid which tended to decreased as increasing DLW in the diets. To be economic viable, DLW can be included in the diets at rate 12 percent whether DLW was obtained with no cost of with cost of 1 bath/kg.
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