Between 10 and 12 weeks after rams have sired the ewes, the shepherd uses an ultrasound scanner to determine which ewes are pregnant and how many lambs each one will have in the spring.
Kui jäärad on uttedega paaritunud, uurib karjus kümne kuni kaheteistkümne nädala pärast ultraheliskanneri abil, millised uted on tiined ja mitut talle on kevadel oodata.