I have partridge rock hens (hatchery) and they are good layers. My hens were small to begin with but filled out the second year. Their youngsters seem to be good sized. I haven't heard of any hatching issues with the Partridge but they are not as common.Hum... not sure why you are having a hard time. I have never had a fertility issue with mine. I had a pen breach so I have to wait a bit on them. I need to hatch a good bit out for me this year.