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The objective of this study was to evaluate the performance of two pastoral farming systems using automatic milking systems (AMS). Two farmlets were established at the DairyNZ Greenfield Farm and were evaluated over a single lactation. The GRASS farmlet (92 cows, 3.2 cows/ha) was self-contained except for 2% of the diet fed as supplement in the AMS. In the GRASS+ farmlet (72 cows, 3.6 cows/ha) 18% of the diet was from feed grown off the milking platform. Modelling the economic performance of the two systems showed a greater operating profit for the GRASS system at milk payouts ranging from $4.50 to $6.50/ kgMS. The field study showed that AMS can be successfully integrated into both all-pasture and higher supplementary feed pastoral dairy production systems. The design of profitable farming systems incorporating AMS technology should consider maximising milksolids per AMS through both milking frequency and ratio of cows per AMS.

An evaluation of two pastoral dairy production systems using automatic milking technology