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Pasture renewal on the milking platform of dairy farms may or may not involve growing forage crops in the transition from old to new pasture. old pasture to new pasture sequences with and without forage cropping were evaluated on representative farms from Waikato, taranaki, Canterbury (irrigated) and southland using the Farmax Dairy Pro model. If no beneficial effects of pasture renewal were assumed, cropping scenarios with turnips (taranaki) or maize silage (Waikato) increased milksolids (Ms) production per ha, but kale (southland) and no forage crops (all regions) resulted in lower Ms yields. Consequently, the profit of cropping scenarios was similar or less profitable than the base scenarios without pasture renewal or crops. If beneficial effects of pasture renewal were assumed, the use of forage crops increased profit. Noncrop options also increased profit if the new pastures persisted for at least 4 years, and increases of either 10% in pasture production or 0.5 MJ Me/kg dM in pasture quality were observed. there was little difference in profitability between crop and non-crop scenarios in Taranaki (turnips) and Waikato (maize). Profitable results from cropping and pasture renewal assumed good crop and pasture establishment, and effective utilisation of the feed generated. In general, if old and renewed paddocks perform similarly (production and quality) and both contain beneficial endophytes, the benefits of cropping or renewal are expected to be small and not economically worthwhile.

Effects of integrated cropping and pasture renewal on the performance and profit of dairy farms