1. Department of Animal Science, Kwame Nkrumah University of Science and Technology (KNUST), PMB, University Post Office, Kumasi AK448, Ghana
2. School of Food Science and Nutrition, University of Leeds, Leeds LS2 9JT, UK
3. Department of Chemistry and Physics, Sokoine University of Agriculture, S.L. P Chuo Kikuu, Morogoro P.O. Box 3038, Tanzania
4. Department of Consumer and Food Sciences, University of Pretoria, Private Bag X20, Hatfield 0028, South Africa
5. Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK