The number of lambs born to hoggets was up significantly - 7.7 per cent - to 1.2 million.
In the North Island, numbers were up 5.5 per cent in the North Island, when compared to the drought-affected lamb crop of 2013, which was the smallest for the island since records began.
In the South Island, lamb numbers fell by 2.6 per cent to 13.4 million - as a result of fewer fewer breeding ewes, due to land use changes to dairy and dairy support activities, particularly in Southland.
Ewe lambing percentages were up across all regions, with a 7.1 percentage point lift on the East Coast -- which represents about a quarter of New Zealand's lamb flock - to 123.7 per cent.
Across the country, fewer lambs are expected to be processed during 2014-15, compared to 2013-14, Beef and Lamb said.
The number of lambs available for export in the current season is estimated at 19.95 million head, compared to 20.3 million head last season - a drop of 1.9 per cent.
Burtt said farmers are holding on to lambs to rebuild sheep numbers, particularly in the North Island. The average carcase weight this seasons expected to increase slightly - by 0.7 per cent - to 18.4kg, as a result of slightly lower stocking rates and expected "normal" conditions.