I have not had more then two bred heifers because thats all i showed last year but, i could fit around 4-5. If i where you i would make it alittle bit wider because the problems im having is trying to fit the fans behind the calves with enough space between the fan and calf. Trying to get the manure from behind them expecially if your cattle are longer bodied is kind of tough. I would love to let them loose in seperate pens but theres really not enough room. So i keep them tied.