An animal feed supplement composition comprising a phospholipid composition having a specific ratio of components as defined below: Phosphatidylcholine 18.+-.1; Phosphatidylethanolamine 14.+-.1; Lysophosphatidylcholine 1.+-.1; Lysophosphatidylethanolamine 1.+-.1; Lysophosphatidylinositol 2.+-.1. The phospholipid composition provides an improved animal feed which has beneficial effects on animal performance.