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The ewes are scanned using Ultrasound to determine if they are in lamb. At this stage the lamb foetuses should be between 7 and 12 weeks old. The operator determines the number of lambs the ewe is carrying and his assistant marks the ewe with coloured paint: no mark = twins; green = single; orange = triplets; red = nothing; blue = nothing. The ewes are then housed in groups according to how many lambs they are going to have so that they can be fed the right amount of concentrate feed. Triplet bearing ewes get the most concentrates. Barren ewes are marked red and will stay outside without concentrates and will be sold as culls.
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