Feeding fish oil and linseed oil to laying hens to increase the n-3 PUFA of egg yolk
2008
Kralik, G.,J.J. Strossmayer Univ., Osijek (Croatia). Faculty of Agriculture | Skrtic, Z.,J.J. Strossmayer Univ., Osijek (Croatia). Faculty of Agriculture | Suchy, P.,Veterinarni a Farmaceuticka Univ., Brno (Czech Republic) | Strakova, E.,Veterinarni a Farmaceuticka Univ., Brno (Czech Republic) | Gajcevic, Z.,J.J. Strossmayer Univ., Osijek (Croatia). Faculty of Agriculture
The research was carried out to assess the possibility of egg yolk enrichment with n-3 PUFA through supplementation of fish oil (FO) and linseed oil (LO) to layer diet. A total of 84 ISA Brown laying hens were divided into three groups. Each group consisted of seven cages with four hens per cage. Groups received diets differing in combinations of oils. The diet fed to group E1 contained 1.50% LO and 3.5% FO, group E2 had diets with 2.5% LO and 2.5% FO, and group E3 was fed diets with 3.5% LO and 1.5% FO. Contents of fatty acids in oils, diets and egg yolks were analyzed. The egg yolk content of alpha-linolenic acid (alpha-LNA) and omega-3 polyunsaturated fatty acids (n-3 PUFA) in total fatty acids was increased (P less than 0.001) due to the increased content of linseed oil in hen diet. In groups E1, E2 and E3, the alpha-LNA content was 3.25%, 4.33% and 5.18%, respectively, and the n-3 PUFA content was 6.80%, 7.22% and 8.50%, respectively. The content of eicosapentaenoic acid was higher (P less than 0.05) in egg yolks of group E1 than that of groups E2 and E3. No significant differences were found among groups in the docosahexaenoic acid content. The omega-6/omega-3 PUFA ratio in groups E1, E2 and E3 was 2.96, 2.93 and 2.49, respectively. Increased concentration of linseed oil and reduced concentration of rapeseed oil in diets resulted in less SFA (P less than 0.001) and more n-3 PUFA in egg yolks. It was determined that laying hens have the ability to synthesize EPA and DHA from alpha-LNA if they receive enough alpha-LNA through their diets.
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