Prostaglandin-like activity, fatty acid and phospholipid composition of sika deer (Cervus nippon) antlers at different growth stages.

1. The alteration of lipid composition has been shown to take place at different stages of antler growth. 2. The greatest amounts of phospholipids and polyunsaturated fatty acids have been found during the most intense soft antler growth period. 3. The bioregulators of lipid origin which are prostaglandins of A, B, E and F groups have been found at the same stage.