I will also like to add to the post above of the forage content of my herd. I feed my animals three different types of alfalfa ranging from a relative feed value of 160-217. I have all my deer in three pens from mid-October through the end of April. These are my winter pens. This makes it easy for me to change from one alfalfa to another if the alfalfa they are eating in that one particular I feel is too hot for them.
When I sort deer in the spring they are more spread out. I separate them to a ratio of to 2 deer per half acre size and they can't keep up with the forage of clover, brassica, and the sunny/mix grass seed I have mixed in to fill all the dead spots since I can't irrigate these pens during the heat of summer. If I get that ratio right I will not have to rotate deer out for a recovery period. With this mixture of forage and ratio of deer I do not have to feed alfalfa from spring green-up time till mid-October. My animals get clean water year round also. I believe if you give them water in the winter it helps their appetite and they won't shut-down and wither away like some of the deer do outside the fence.
If it isn't broke, don't fix it. When you find the right feed, forage, clean water, and keep the numbers down you will have a less stressed herd and one that is easier to maintain. Your herd health as a whole will be better and you will spend less money on anti-biotics and over-worming. Green is in, and since it is nearly impossible to call your herd organic, you can still have a very natural herd that is eye pleasing with a consistent look to it. With great deer comes great responsibility. JOE