REPLACEMENT OF FISH MEAL IN
DIETS FOR JAPANESE SEA BASS (Lateolabrax Japonicus): I. IN
VIVO AND
IN
VITRO APPARENT DIGESTIBILITY OF FEED INGREDIENTS
M. Xue, L.F. Qin, L. Luo, X.F.
Wu, H.N. Cao, Y. Yu
In vivo apparent digestibility
coefficients (ADCs) for dry matter, nitrogen, energy and in vitro ADC
for nitrogen for 24 commonly used feed ingredients were determined for
Japanese sea bass (Lateolabrax japonicus). Each test diets was composed of
70% reference diet and 30% test ingredient, which 0.1% of Yttrium oxide (inert
marker) mixed with mineral premix. 4 batches of 28d experiment for in
vivo test and a two-step in vitro experiment were conducted. ADCs for dry
matter, nitrogen and energy were highest for spray dried blood meal and
several fish meals except Chinese fish meal, although several other ingredients,
including soybean meal, wheat gluten and fish protein concentrated had
similar ADCs. Japanese sea bass were capable of digesting protein very
effectively in almost all ingredients tested, but quite different
for digesting energy. The regression relationship between in vitro and in
vivo ADCp Of 24 ingredients is Y(in vivo)=25.20±0.70X(in vitro), r = 0.76. After
eliminating the data of the water-soluble and the ingredients with factors
that difficultly to be digested under in vitro condition, such as spray
dried blood meal, wheat gluten, wheat and shrimp meal, the regression
relationship is Y=1 1.20±0.87X, r = 0.86.
(Beijing
Aquaculture Nutrition Research Center, Beijing, 100075, China)