期刊名称：Western Australia. Fisheries Department. Fisheries Research Reports
印刷版ISSN：1035-4549
出版年度：2008
卷号：178
页码：149-149
出版社：Government of Western Australia / Department of Fisheries
摘要：This study examined the utilisation efficiencies of three diets when fed to rainbow trout in
a 28-day growth study. Fish of 96.4 ± 1.7 g (mean ± S.D.) were kept in freshwater at 13.9 ±
0.2°C. Each of the diets was fed at one of three ration levels and an additional starved treatment
was also included. The diets differed by an increasing concentration of lupin (L. angustifolius
cv. Myallie) kernel meal (MKM) inclusion. Two lupin kernel meal inclusion levels of 15%
(MKM15%) and 30% (MKM30%) were studied. The diets were formulated to equivalent
digestible protein and energy specifications based on predetermined digestibility values for
each of the ingredients used. However, a significantly higher level of digestible energy of both
MKM diets was measured, as well as a significantly higher level of digestible phosphorus in
the MKM30% diet. There were no significant differences in digestible protein level among the
diets. No significant differences between the diets were observed with respect the utilisation
of dietary digestible energy. Over the full data range, the energy utilisation efficiency was
described by the linear equation of; y = 0.747x - 26.174, R2 = 0.985. Efficiency of protein
utilisation over lower digestible protein intake levels was also linear (y = 0.599x - 0.142, R2 =
0.905), but over the full range was better described by a non-linear function. The comparison
of the three diets in this study shows that the dietary inclusion of lupin kernel had no significant
effect on the gain of either protein or lipid energy relative to protein or lipid energy intake,
respectively. Protein energy use efficiency constants varied depending on the feed intake level,
but were not significantly affected by diet type. The efficiency of use of lipid energy for lipid
energy retention was also not affected by diet type. The findings of this study demonstrate
that the inclusion of lupin kernel meal does not affect the ability of rainbow trout to utilise the
dietary digestible protein and energy of diet in which it is included.
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