Apparent digestibility of selected ingredients in diets for juvenile grouper, Epinephelus coioides (Hamilton)
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Apparent digestibility coefficients (ADCs) for dry matter (ADCdm) and crude protein (ADCcp) of selected feed ingredients were determined in vivo for grouper using passive faeces collection (Guelph System). A reference diet (RF) and test diets (consisted of 70% RF and 30% test ingredient) with 1% Cr2O3 as an inert indicator were used. An RF contained 45% protein, 10% fat and 15.7 kJ g−1 metabolizable energy. Three isonitrogenous and isocaloric diets, each contained a test ingredient (white fish meal, white cowpea meal and ipil-ipil leaf meal), were used in a growth study based on ADCcp of feed ingredients. An RF without Cr2O3 was a control. The ADC values of experimental diets were also determined. In grouper, the ADCdm of white cowpea meal, defatted soybean meal, wheat flour and shrimp meal (74–76%) were significantly lower than that of squid meal (99%), but comparable with those of the fish meals (84–89%). No significant difference was observed between the ADCdm of ipil-ipil leaf meal, rice bran and wheat flour (56–73%). The ADCcp of white cowpea meal and defatted soybean meal were similar to those of the fish meals, squid meal and shrimp meal (94–99%). The ADCcp of wheat flour was comparable with that of ipil-ipil leaf meal (79–83%). Rice bran had the lowest ADCcp value of 43%. Based on specific growth rate (SGR), the growth of fish fed white cowpea meal-based diets was similar to that of the control fish (3.2–3.3% day−1). Also, no significant difference was observed between the ADCdm (68–72%) and ADCcp (88–91%) of white cowpea meal-based diet and the control diet. The results suggest that ADC values can be used as indicators to determine the nutritional value of feed ingredients. White cowpea meal can be incorporated as a protein source in practical diet for grouper at 20.5% of the diet with no adverse effect on growth.
Suggested Citation
Eusebio, P. S., Coloso, R. M., & Mamauag, R. E. P. (2004). Apparent digestibility of selected ingredients in diets for juvenile grouper, Epinephelus coioides (Hamilton). Aquaculture Research , 35(13), 1261-1269. https://doi.org/10.1111/j.1365-2109.2004.01148.x
Chủ thể
animal nutrition
; diet
; digestibility
; feed composition
; feeding experiments
; fishmeal
; growth rate
; juveniles
; leaves
; nutritive value
; proteins
; Epinephelus coioides
; Glycine max
; Leucaena
; Oryza sativa
; Triticum aestivum
; Vigna
; Animal protein sources; Plant protein sources; groupers
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