Egg yolk is rich in nutrients and is an important source of protein, vitamins and minerals. Egg yolk contains vitamins A, D, E, B1, B2, B6, B9 (folate), B12, choline, calcium, iron, phosphorus, zinc and selenium. Egg yolk also contains about 2-3 grams of protein, of which egg yolk lecithin choline. Choline play an important role in hairball removal. It will emulsify the fat and combined the hair bulbs to condense into a mass in the stomach, so that it is easier to be discharged by your pet. Besides that, Egg Yolk also may makes your pett's hair to be more shiny and softer. In addition, the nutritional value of egg yolk is also relatively high, and cats who eat some egg yolk appropriately will have better physical fitness.