1. COMPOSITION of an EGGTOTAL WEIGHT OF EGG IS 50 gms. EGG YOLK vitamins a,d,e,k minerals total fat content of whole egg is present in egg yolk 1/5thof total protein of whole egg 33%of total liquid of egg is egg yolk calorie content is 3 times the egg white it produces 60 calories contains lecithin an important emulsifier in food production yellow colour is due to leutin and zeaxanthin…….xanthophylls There are yolkless eggs also or a single egg may contain 2 egg yolks.