Evaluation of dietary inclusion of yellow lupin (Lupinus luteus) kernel meal on the growth, feed utilisation and tissue histology of rainbow trout (Oncorhynchus mykiss)
2004
Glencross, B. | Evans, D. | Hawkins, W. | Jones, B.
This study assessed the use of yellow lupin kernel meal (YLKM) in diets for rainbow trout. Increasing level of inclusion (0%, 12.5%, 25%, 37.5% and 50%) of YLKM were provided at the expense of fish meal in diets formulated to be isonitrogenous (383 g/kg) and isoenergetic (20 MJ/kg) on a digestible basis. Growth of rainbow trout (initial weight, 35.8+/-0.7 g; mean+/-S.D.) fed the experimental diets for 42 days was significantly reduced at the 50% YLKM inclusion level, but linear regression modeling suggested a decline in growth at each inclusion level. However, the level of inclusion of the YLKM did not significantly affect feed intake. Food conversion ratio also deteriorated significantly at the 50% inclusion level, with a linear regression model also suggesting a decline in FCR at each inclusion level. Retention efficiency of nitrogen was unaffected by level of inclusion though a significant decline in the efficiency of energy retention was observed with increasing inclusion of YLKM. No significant effects of ingredient inclusion on body composition were noted, though some alterations in organ somatic indices were identified. Minor effects were a trend for an increase in relative size of the gastrointestinal tract, and decreases in hepatocyte lipid droplets with increasing levels of YLKM inclusion. This ingredient presents as a highly useful feed ingredient for aquaculture rations.
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