We have tried different systems. If we can get the calf caught right when she has it, then the bulls get the dams # and the heifers get the year then the dams number. But sometimes that get's too much. So last year we started with 1701, and went from there with all the heifers, and the bulls got their dams # if we were sure, if not they got any number and I just watched to see who went on who the next day. We are lucky in that we have a friend that is a cattle dealer and we get back all the tags they cut out of the ears. So we have all kinds of tags, but get plenty back that we can use. I wash and re-mark all the numbers and then we use a new back. Tags get expensive when you are buying 100-200 a year.
With the consecutive numbers on the heifers, we can change their tag when we do all the culling and whoever we keep often gets a tag that is representative of who her family is ; like year and dam's number.
We also write on the back with a bull name/number.
I have found that the Y-Tex marker to be far superior to the Allflex. Someone told me the other day they really like the Z-tag marker so I picked one up to see if I like it. Most all the markers come with 2 tips and we usually do use them both during the life of the pen. But I have been very happy with the Y-tex one so far. I also do not push real hard so the tips seem to last a bit longer. The Y-tex doesn't seem to put out too much ink; the Allflex one will not put out enough then if you push it like they say, you get a big blob.....UCK