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1. The effect of including lupin meal (Lupinus angustifolius), with or without rapeseed meal, in computer‐formulated, least‐cost diets for broilers has, been determined.
2. In the first experiment the diets contained 0, 8 (with and without supplementary methionine, lysine, or methionine and lysine) or 16% lupin meal: addition of the lupin meal required a concomitant addition of 5 % rapeseed meal (by computer selection).
3. The diets were fed from 38 to 65 d and did not affect live‐weight but the efficiency of food utilisation was significantly worse on the 16 % lupin, 5% rapeseed meal diet than it was on the control diet.
4. The second experiment was designed as a 2 x 4 factorial to separate any effect due to rapeseed meal from that due to lupin meal, the treatments, which were applied from 1 to 62 d, being 0, 8, 16 and 24% lupin meal with and without 5 % rapeseed meal.
5. Birds gained more rapidly in the second experiment on diets containing 16 or 24% lupin meal whereas live‐weight was depressed when 5% rapeseed meal was included in the diets containing 0 or 8% lupin.
6. The 16 and 24% lupin treatments also had added dietary fat from 6 to 9 weeks of age and this may have ameliorated the adverse effect of rapeseed meal.
7. Up to 16% lupin meal and 5% rapeseed meal had no detectable effect on the colour, appearance, flavour or texture of roasted chicken meat when evaluated by a trained taste panel.
Notes
Present address: Animal Research Institute, Yeerongpilly, 4105, Queensland, Australia.