title: Effects of dehulling, steam-cooking and microwave-irradiation on digestive value of white lupin (Lupinus albus) seed meal for rainbow trout (Oncorhynchus mykiss) and Atlantic salmon (Salmo salar).
abstract: A digestibility trial was conducted to assess the effect of dehulling, steam-cooking and microwave-irradiation on the apparent digestibility of nutrients in white lupin (Lupinus albus) seed meal when fed to rainbow trout (Oncorhynchus mykiss) and Atlantic salmon (Salmo salar). Six ingredients, whole lupin seed meal (LSM), dehulled LSM, dehulled LSM steam-cooked for 15 or 45 min (SC15 and SC45, respectively) and LSM microwave-irradiated at 375 or 750 W (MW375 and MW750, respectively), were evaluated for digestibility of dry matter, crude protein (CP), lipids, nitrogen-free extractives (NFE) and gross energy (GE). The diet-substitution approach was used (70% reference diet + 30% test ingredient). Faeces from each tank were collected using a settlement column. Dehulled LSM showed higher levels of proximate components (except for NFE and crude fibre), GE and phosphorus in comparison to whole LSM. Furthermore, SC15, SC45, MW375 and MW750 showed slight variations of chemical composition in comparison to dehulled LSM. Results from the digestibility trial indicated that dehulled LSM, SC15, SC45 and MW375 are suitable processing methods for the improvement of nutrients' apparent digestibility coefficient (ADC) in whole LSM. MW750 showed a lower ADC of nutrients (except for CP and lipids for rainbow trout) in comparison with MW350 for rainbow trout and Atlantic salmon, suggesting a heat damage of the ingredient when microwave-irradiation exceeded 350 W.
authors.affiliation: a Escuela de Acuicultura, Facultad de Recursos Naturales , Universidad Católica de Temuco , Temuco , Chile.
authors.forename: Patricio
authors.initials: P
authors.lastname: Saez
authors.forename: Aliro
authors.initials: A
authors.lastname: Borquez
authors.forename: Patricio
authors.initials: P
authors.lastname: Dantagnan
authors.forename: Adrián
authors.initials: A
authors.lastname: Hernández
mesh_terms: D000821:Animal Feed / Q000032:analysis; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D004032:Diet / Q000662:veterinary; D004063:Digestion / Q000502:physiology; D005511:Food Handling / Q000379:methods*; D031297:Lupinus / Q000737:chemistry*; D008872:Microwaves; D009753:Nutritive Value; D017686:Oncorhynchus mykiss / Q000502:physiology*; D020317:Salmo salar / Q000502:physiology*; D012639:Seeds / Q000737:chemistry; D013227:Steam
chemical_list: D013227:Steam
keywords: Atlantic salmon; Lupinus albus; digestibility; processing; protein feeds; rainbow trout