It has been my experience that a doe that is bred in theearliest stages of rut will birth her fawns at an earlier date (common sense, I know). This earlier in the year birth will give a female fawn enough time to develop so that it is possible that she can be bred in the "2nd rut". Typically, if she is bred, she will only have one fawn in the spring and due to the late birth, that fawn will not breed in the following rut season. Just my anecdotal experiences.