I just normally get everyone n the pen (using bucket) and eating from the trough, the separate the boy off with the bucket, and smear his chest while he is eating. No need to turn over, and greed has so far not reduced the girls' fertility... It is helpful anyway to get them in daily (or every other day) and note who has been tupped. My girls usually have large numbers on their side already, so I can identify at a distance if necessary, who's been with the boy. Since using sponges that is not so much an issue anymore, they are all due within a few days of each other.