Effect of dietary high-oleic acid sunflower seed, palm oil and vitamin E supplementation on broiler performance, fatty acid composition and oxidation susceptibility of meat

Abstract

1. A study was conducted to evaluate the effect of inclusion of two fat sources: high-oleic acid sunflower seed (HOASS; 0, 50, 100, 150 and 200 g/kg diet) and palm oil (PO), and dietary supplementation of vitamin E (α-tocopheryl acetate, 200 mg/kg diet) on performance, fatty acid composition and susceptibility to oxidation of white and dark chicken meat during refrigerated storage. Female chicks (3 to 6 weeks) were given one of 5 diets containing 90 g/kg of added fat with increasing monounsaturated fatty acid (MUFA) content, adjusted by progressively replacing PO by HOASS.

2. Body weight gain and gain:food ratio of birds were depressed in diets containing the highest proportions of HOASS (150 and 200 g/kg). Relative abdominal fat was reduced in birds fed diets including HOASS, except in the diet containing 100 g HOASS/kg. The inclusion of α-tocopheryl acetate improved body weight gain and gain:food ratio.

3. According to the fatty acid profile of the diets, saturated and polyunsaturated fatty acid (SFA and PUFA, respectively) contents were significantly reduced and MUFA content was significantly increased in white and dark chicken meats when the saturated oil, PO, was replaced progressively by HOASS in the diet. The inclusion of α-tocopheryl acetate increased PUFA content in both meats.

4. After 4 and 7 d of refrigerated storage, white and dark meat samples obtained from birds fed on diets containing HOASS had significantly lower thiobarbituric acid reacting substance (TBARS) values than those derived from the PO diet. The addition of α-tocopheryl acetate significantly reduced the lipid oxidation in white and dark meat.

5. Overall, the results showed that increasing MUFA content of chicken meat by replacing dietary PO with HOASS (up to 100 g/kg) did not adversely affect broiler performance and reduced the susceptibility of meat to oxidation during refrigerated storage. Dietary α-tocopherol supplementation improved chicken performance and was effective in protecting lipid meat from oxidation.

Acknowledgements

This study was supported by a grant from CICYT (Comisión Interministerial de Ciencia y Tecnología) of Spain as a part of Project AGL2001-1116. The authors are grateful to Avicu, S.A. (Guadalajara, Spain) and especially Ángel Yagüe for their kind cooperation in processing birds. Thanks are also due to Koipesol Semillas, S.A. (Carmona, Sevilla, Spain) for providing sunflower seeds and to DSM Nutritional Products Iberia, S.A. (Alcalá de Henares, Madrid, Spain) for supplying α-tocopheryl acetate.