Hi everyone. I have 3 silkie hens and they are all about 3 years old. They are healthy, cage free during daytime, and very healthy. I want them to live atleast 15 years. How do I keep them from getting tumors and such, along with other diseases? Or should I give my chickens away and start with a new batch (which i really don't want to do, but if its for their own good, then I can do it) I live in rainy ol' Washington state, and it rains a lot during spring and occasionally during summer. I know chickens like warm weather, and cold weather can get them prone to other diseases. is this true? THANKS! oh by the way i'm a new comer to your website so... yey!