Would require tagging at birth or DNA testing, both of which are expensive.
Using a raw kg weaned figure will favour bigger ewes. Weight of lambs weaned as a percentage of ewe weight at tupping is the better figure.
Every heifer that is born without assistance and weaned by her own mother will be retained.
The default setting is to bull them all, but I'll cull out any that needs individual assistance. I cull again at AI for any pelvic malformation and temperament.
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