Hi,I have just noticed my first two ducklings are hatching,as it is my first time with ducks,do I do the same as hen chicks and not feed them for 24 hrs or so-then on to the crumb? They are being hatched by broody hens!-I have 12 under each broody.any advice would be really appreciated only i want to make sure I am ready for when they are fully hatched!