The effect of fish protein hydrolysate (FPH) supplementation on the growth
performance, feed and protein utilization and feeding cost of Nile tilapia (Oreochromis
niloticus) was determined. Juvenile Nile tilapia were randomly distributed into five groups and
fed with five isonitrogenous (32% crude protein) and isolipidic (7% crude fat) diets. The
control diet contained fish meal without FPH supplementation (basal diet). Diets 2-5 contained
10% and 30% oil layer protein hydrolysate (OLPH) and 10% and 30% of aqueous protein
hydrolysate (APH), respectively. All experimental fishes were manually fed to apparent
satiation in triplicate groups for 8 weeks. Fish fed with APH10 diet had significantly higher
growth performance (P < 0.05) in terms of final fish body weight, weight gain, average daily
gain (ADG) and specific growth rate (SGR). In addition, fishes fed with APH10 had
significantly higher feed utilization, protein efficiency ratio (PER) and protein productive value
(PPV) than the fishes fed with the other diets (P < 0.05). The diet containing over 10% APH
caused a reduction in growth performance, feed and protein utilization, possibly resulting from
the high small peptides and amino acids which were over the appropriate range for dietary
protein requirements for Nile tilapia. The cost of APH10 diet exhibited 26 bahts per kg fish
gain in weight, it was lower than all other test diets. Our current finding indicates that dietary
APH10 could improve growth performance, feed efficiency, protein utilization, and beneficial
feeding cost for Nile tilapia.
Keywords
Fish by-product, Nile tilapia, Papain, Protein hydrolysate, Growth performance
INTERNATIONAL JOURNAL OF AGRICULTURAL TECHNOLOGY
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