Published in Scientific Papers. Series D. Animal Science, Vol. LX
Written by Mihaela SĂRĂCILĂ, Tatiana Dumitra PANAITE, Arabela UNTEA, Mariana ROPOTA, Petru Alexandru VLAICU, Margareta OLTEANU, Cristina ȘOICA
The 6-week experiment used 168 Tetra SL (26 weeks) layers assigned to 4 groups. Compared to the conventional diet formulation used for the control group (C), in order to enrich the eggs in ω – 3 PUFA, the diet formulations used for the experimental groups (E1, E2, E3) included 7% flaxseed meal. Diet E1 used vitamin E (100 mg/kg feed) as antioxidant, while the other diets used 3% (E2) and 1.5% (E3) grape seeds powder. Egg samples were collected throughout the experimental period: initially, in the beginning of the experiment, in weeks II, IV and VI and when the experiment ended. The collected eggs were used to form egg yolk samples, which were assayed for fatty acids, peroxide value (PV), concentration of conjugated dienes (CD) and concentration of conjugated trienes (CT) and total antioxidant capacity. The yolks of the eggs from the experimental groups had a significantly (P≤0.05) higher concentration of ω – 3 PUFA compared to those from the control group. The lowest PV was determined in the yolk from E2 groups (3% grape seeds powder). The lowest CD concentrations were traced in the eggs collected on week II from groups E1 (6.278±1.931 µmol/g) and E2 (6.254±0.196 µmol/g). The yolks from groups E2 and E3 collected on weeks II and VI had the lowest CT absorbance. The antioxidant capacity was higher in the yolk from groups E1 (100 mg vitamin E/kg CF) and E2 (3 % grape seeds powder). The yolks from E3 (1.5% grape seeds powder) eggs collected in the end of the experiment had a significantly (P≤0.05) lower antioxidant capacity than E1 and E2.
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