As a volunteer Brand Inspector we get the Montana Estray list every couple months. Even though some of the critters are not recovered the proof of ownership is in the markings. In many of the eastern Montana counties 20, 30, 50 head or more will disappear!! There are always the single calves, steers or heifers that probably end up in someone's freezer but I can't imagine how you hide 20+ head - though the population in some of these areas is rather thin. In the last list there were a number of head that were lost in 2002 and recovered in early 2004 - it never hurts to keep us looking.
In Montana, the brand office really restricts how close (by county) similar brands & brand locations can be for good reason. For most of last summer we had a hereford heifer join our herd, she was wild as can be so I reported her, but she was so hairy I couldn't read her brand. Finally when we brought in our calves to wean we caught her and clipped her to read the brand. It was so blotched that it was barely legible, I called the office with what I thought it was and they said that only one person had that brand in that location in Montana and he was located clear across the state, Wolf Point. So we figured that I must have misread the brand (yeah right - was that slash blob, quarter circle blob or bar blob??) When we hauled her in I was right, they tracked the description and brand through several owners & shippers to a rancher on the other side of the mountain range from us. He'd bought her and her dam and turned them out, but he hadn't bothered to report her missing because he figured she'd just come back home.
Our horse brand is on the rt shoulder and we freeze brand the horses, our cattle brand is on the rt rib. There are advantages and disadvantages to both types of brands depending on the animal, brand location and animal color!
If you have ever tried to read a horse's lip tattoo or a cow's ear tatoo after several years you know that they can be really hard or impossible to make out. Ear notches on cattle could obliterate tattoos too - besides who wants to get close enough to read them on a bad tempered mama! We have one who tries to bite you when she is in the squeeze chute, but we don't have coyote or dog problems!!!