Journal article
Pretreatment of Soybean Meal with Phytase for Salmonid Diets to Reduce Phosphorus Concentrations in Hatchery Effluents
The Progressive fish-culturist, Vol.57(2), pp.114-119
04/1995
Handle:
https://hdl.handle.net/2376/101984
Abstract
Performances of rainbow trout (Oncorhynchus mykiss) fed experimental diets containing phytase‐treated or untreated soybean meal with graded levels of supplemental phosphorus (P) were compared with the performance of rainbow trout fed a standard commercial feed. Growth rates and feed conversions (feed fed/weight gain) of fish fed diets containing phytase‐treated soybean meal were equal to or significantly better (P < 0.05) than those of fish fed a commercial diet. Whole‐carcass P concentrations of fish fed phytase‐treated diets were not significantly different from those of fish fed commercial diets (P > 0.05). Pretreatment with the enzyme phytase increased P availability in soybean meal by hydrolyzing phytin P to an available inorganic form. Converted phytin P replaced supplemental P in the diet and was utilized effectively by rainbow trout. The lower dietary P levels resulted in a 65–88% reduction of P in the effluent. Juvenile fish (1.9 g/ fish, mean initial weight) fed a commercial feed released 4.54 g P/kg weight gain while fish fed a phytase‐treated diet with no P supplementation released 1.61 g P/kg weight gain. Larger fish (16.97 g/fish, mean initial weight) fed a phytase‐treated diet with no supplemental P released only 0.29 g P!kg weight gain to the effluent. Effluent P concentrations were determined by a modified mass balance strategy.
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Details
- Title
- Pretreatment of Soybean Meal with Phytase for Salmonid Diets to Reduce Phosphorus Concentrations in Hatchery Effluents
- Creators
- Kenneth D Cain - Michigan State UniversityDonald L Garling - Michigan State University
- Publication Details
- The Progressive fish-culturist, Vol.57(2), pp.114-119
- Academic Unit
- Center for Reproductive Biology
- Publisher
- Taylor & Francis Group
- Number of pages
- 6
- Identifiers
- 99900546660601842
- Language
- English
- Resource Type
- Journal article