Efficient and effective nutrient management decisions are critical to profitable and sustainable milk production on Australian dairy farms. DairyHIGH 2 (high integrity grass-fed herds) will focus on feedbase research to help Australian dairy farmers grow the same amount of dry forage matter from irrigated pasture, produce the same amount of milk solids per hectare, but halve the amount of nitrogen fertiliser. A key part of the work will be the establishment of farmlets or 'mini farms' to test research theories under real farm conditions. In addition, the management of dairy calves will be monitored to provide evidence of appropriate animal welfare practices.