Alpha-tocopherol transfer efficiency and lipid oxidation in fresh and spray-dried eggs enriched with omega3-polyunsaturated fatty acids.
We evaluated the effect of supplementing a basal diet containing 5% linseed oil with 0, 50, 100, and 200 mg/kg of alpha-tocopheryl acetate (alpha-TA) on alpha-tocopherol content, fatty acid composition, and lipid oxidation in fresh and spray-dried eggs during storage. Alpha-tocopherol transfer efficiency from feed to egg was also studied. The alpha-tocopherol content of fresh egg increased in a dose-dependent manner (16.6, 49.8, 78.9, and 132.3 microg/g of egg for 0, 50, 100, and 200 mg/kg alpha-TA supplementation, respectively), but transfer efficiency decreased, from 41.8% to 26.7%, with increasing alpha-tocopherol content in the diet. Spray-drying significantly decreased the alpha-tocopherol content of eggs and increased lipid oxidation. Dietary supplementation with different levels of alpha-TA significantly reduced lipid oxidation in spray-dried eggs. Alpha-TA supplementation had no significant effect on the fatty acid composition of fresh eggs.
Galobart
J
J
Departament de Ciència Animal i dels Aliments, Facultat de Veterinària, Universitat Autònoma de Barcelona, Bellaterra, Spain.
Barroeta
A C
AC
Baucells
M D
MD
Cortinas
L
L
Guardiola
F
F
D000821:Animal Feed; D000818:Animals; D000975:Antioxidants / Q000008:administration & dosage* / Q000378:metabolism; D002645:Chickens / Q000502:physiology*; D019587:Dietary Supplements; D004305:Dose-Response Relationship, Drug; D004531:Eggs / Q000032:analysis*; D015525:Fatty Acids, Omega-3 / Q000032:analysis*; D005260:Female; D005511:Food Handling / Q000379:methods; D008043:Linseed Oil; D050356:Lipid Metabolism; D008055:Lipids / Q000032:analysis; D010058:Oviposition; D010084:Oxidation-Reduction; D024502:alpha-Tocopherol / Q000008:administration & dosage* / Q000378:metabolism
D000975:Antioxidants; D015525:Fatty Acids, Omega-3; D008055:Lipids; D008043:Linseed Oil; D024502:alpha-Tocopherol