Hello

ICAR is Indian Council Of Agricultural Research which manages research and education in agriculture. So , if you  have completed your graduation with ICAR affiliated college  so it will be better if you  complete  your post graduation with ICAR affiliated college because it will enhance your degree and also you will find good exposure too. But if there is no such option you can take admission in non Affiliated ICAR college , there is no boundation to complete your post graduation degree with ICAR college if you have completed you graduation with the  ICAR affiliated college.

All the best!!