I'm going to get some straw for my two nest boxes (6 chickens 20 wks old - not laying yet). I currently have pine shavings in there, but I wanted to get straw since they will (hopefully) be laying soon. The place closest to me sells rye and wheat straw. Which one is better? I'm also going to use some bales for a vegetable garden (apparently you can plant directly in the bales), and they say that either of those kinds works for that... but I want to make sure to get the safest one for the chickens! Thanks for your help!