Pubblicazione scientifica

Optimizing long chain-polyunsaturated fatty acid synthesis in salmonids by balancing dietary inputs

FILONE TECNOLOGICO	TEMA
produzione e raccolta
trasformazione e commercializzazione

RIASSUNTO

The increasing use of terrestrial plant lipids to replace of fish oil in commercial aquafeeds requires understanding synthesis and storage of long chain-polyunsaturated fatty acids (LC-PUFA) in farmed fish. Manipulation of dietary fatty acids may maximize tissue storage of LC-PUFA, through increased production and selective utilization. A data synthesis study was conducted to estimate optimal levels of fatty acids that may maximize the production and storage of LC-PUFA in the edible portion of salmonids. Data were compiled from four studies with Atlantic salmon, rainbow trout, and steelhead trout (total n = 180) which were fed diets containing different terrestrial-based oils to replace fish oil. LC-PUFA (%) were linearly correlated between diet and muscle tissue (p < 0.001; r2 > 44%), indicating proportional storage after consumption. The slope, or retention rate, was highest for docosahexaenoic acid (DHA) at 1.23, indicating that an additional 23% of DHA was stored in the muscle. Dietary saturated fatty acids were positively related to DHA stored in the muscle (p < 0.001; r2 = 22%), which may involve membrane structural requirements, as well as selective catabolism. DHA was found to be optimally stored with a dietary n-3: n-6 ratio of 1.03: 1. These new results provide a baseline of optimal dietary ratios that can be tested experimentally to determine the efficacy of balancing dietary fatty acids for maximum LC-PUFA storage.

DATA

Data di pubblicazione: 10/10/2018

AUTORI

COLOMBO STEFANIE M
PARRISH CHRISTOPHER C
WIJEKOON MANJU P A

ENTE DI AFFERENZA

Department of Ocean Sciences Memorial University of Newfoundland St. John’s Newfoundland and Labrador Canada
DEPT ANIMAL SCIENCE & AQUACULTURE FACULTY OF AGRICULTURE DALHOUSIE UNIV TRURO NOVA SCOTIA CANADA
CANADIAN FOOD INSPECTION AGENCY MEAT HYGIENE PROGRAM GUELPH ONTARIO CANADA
UNIV ILLINOIS US

RIVISTA

PLoS ONE, 13(10), e0205347

IMPACT FACTOR

2,870

indietro