i have no problem what so ever when it comes to lamb vigor, there always straight up, there is a reason to do so if you have a weak lamb that needs a bit to get it up and going, never does any harm and has always worked for me, and nothing is better than the ewes first colostrum, why stop something when its helping?
for the pedigrees i bought most of my ewes in lamb bar this year where i bred my own an so far no problems, opposite of last year..pedigree suffolk lambs can be dopey at times, i no a breeder who colostrum's every single lamb with 120ml an he is considered one of the best breeders in the society, his lambs are all over the world an have no problem what so ever vigour or sooking wise.