We have had some really good lambs this year and did not want to knock them back with castration, on the other hand we have one weedy lamb that castration would probably finish off.Ours were born 1st week in May and was told end of Sept lateset for slaughter but to keep checking on the groin area, as soon as that reddens up we must kill to stop the meat tainting.An experiment this year, we will see what happens.