I personally would not recommend sawdust! It can get in their respitory tract and cause alot ofharm. If you are wanting some sort of bedding for their cageindoors, I would suggest plain newspaper, or a recycled newspaper typebedding. If you are looking for something as alitter, then you can use the above or something similar to woodypet, asIm not sure what is sold in your area.
SO my vote is NO! they dont need sawdust at any time of the year!