This study aimed to examine the economic response to high rates of N in a winter lamb trading operation and was an "add on" to a commercial lamb trading operation in Hawkes Bay. The general policy of the lamb trading operation was to purchase store lambs in autumn at 35 kg liveweight, rotationally graze through winter and early spring and draft for slaughter at 45 kg liveweight. Keywords: nitrogen fertiliser, lamb performance, farmlet trials, lamb finishing, cost effectiveness
