If your concerned about the health of your herd then I would reccomend NOT feeding year round. There are numerous reasons why feeding year round can negatively impact your herd and I don't want to cover them all here. Search the internet for "winter feeding" or some such term and you can find conservation brochures, probably from your state that explain why feeding year round will probably hurt more than help. If you can't find anything email me and I will send you some info.