Lupin ingredients in shrimp (Penaeus monodon) diets: influence of lupin species and types of meals

The nutritive value of five isonitrogenous practical diets containing diffe rent legume meals, whole or dehulled lupin ( Lupinus albus) seed meal (WAD and DAD, respectively), dehulled lupin (L. angustifolius) seed meal (DND), lupin (L. angustifolius) protein concentrate (LPCD), and defatted soybean m eal (SBD), was evaluated in two laboratory experiments (growout and digesti bility studies) using juvenile (4.07 +/- 0.05 g, mean +/- SD) shrimp, Penae us monodon. In the 42-day growout study, shrimp fed SBD or DND had signific antly higher (P < 0.05) growth rates than those fed LPCD, DAD or WAD. Prote in conversion efficiency (PCE) and apparent protein utilization (APU) value s of DND were significantly higher than those of LPCD, DAD or WAD. SBD and DND had significantly higher feed intake values and better feed conversion ratios (FCRs) than WAD and DAD. LPCD had a similar FCR to other diets but l ower feed intake than SBD. Shrimp fed WAD had significantly poorer performa nce in all the above parameters than shrimp fed other diets except for DAD and LPCD. The diets SBD, DND, LPCD, and DAD had significantly higher (P < 0 .05) apparent dry matter digestibilities (ADMD) (68.3-71.4%) than WAD (64.4 %). All diets had a similar apparent protein digestibility (APD) (87.1-89.1 %) with a small, but significant difference being observed for the diets wi th the highest (DND) and the lowest (WAD) protein digestibility. Pellet wat er stability was significantly different (P < 0.05) among the diets. The mo st stable pellet was displayed by LPCD, while WAD had the poorest water sta bility. Dehulling or concentrating lupin seed protein did not improve the n utritive value of lupin diets for juvenile P. monodon. The lupin seed meal of L. augustifolius was better utilized by P. monodon than that of L. albus and the nutritive value of L. angustifolius diet was equal to that of soyb ean (control) diet. Results of a feeding preference test also indicated tha t L. angustifolius diet was more attractive for juvenile P. monodon than L. albus diet. (C) 1999 Elsevier Science B.V. All rights reserved.