I used 160729 last year, and unfortunately had an outbreak of a nasty strain of footrot through those ewes and lambs.  We scored them (for footrot) at marking and found that most of 729s progeny had either got over it completely or didn’t have it while some other lambs had score 5 and 4 lesions in multiple feet.  Now they are 7 months old the 729 progeny are growing well, while some of the others are quite stunted due to footrot.  It is quite an exciting trait!