Something dried can not be compared to fresh like that. Chickens drink less if it is fresh, with water in it. If you add the extra water they need the amount of vitamines/ grams will be less than 40% proteins. But its a good way to use herbs for autumn/winter. Best way to keep vitamines in after harvesting is to freeze the herbs.fresh herbs contain a lot of water. they are much stronger if dried and boiled.
fresh nettle contains 17% proteins and dried 40%!