23 Chapter 2 Mathematical relationships between the intake of n-6 and n-3 polyunsaturated fatty acids and their contents in adipose tissue of growing pigs L.Q. Nguyen 1 , M.C.G.A. Nuijens 2 , H. Everts 2 , N. Salden 3 and A.C. Beynen 2 1 Faculty of Animal Sciences, Hue University of Agriculture and Forestry, Hue City, Vietnam 2 Department of Nutrition, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands 3 Sondag Voeders, Veghel, The Netherlands