I have two hens and just bought a 50lb bag of feed. I just did some reading and it said one should use up an opened bag of feed within two weeks or it will get stale, like bread. A couple of questions, since there is no way my two birds will eat 50 pounds in two weeks would it be wise to pack some feed in zip locks and freeze it so it last longer? Second question, is there any truth to feed going stale and does it make any difference to the birds?