Feed

A deep dive into the data on substitution rates based on real measurements reveals just how careful farmers need to be when it comes to budgeting on the returns from supplementary feeding. The Prime Minister’s Chief Science Advisor Dr John Roche shared his analysis at a Taranaki Pasture Summit field day in late 2025 and in this podcast episode he steps listeners through his findings, explaining substitution rates and the concept of marginal milk. Drawing on extensive research and practical examples, he outlines why more feed does not always translate to more profit, and how important it is to look at the real costs of the extra production.

While it’s already getting busy onfarm, taking a bit of time now to think about the wider feed strategy and paddock selection can pay dividends later. Words Anne Lee.

Maize is pretty amazing for dairy farmers with both environmental and animal feed benefits that align with Fonterra’s target of 80% home-grown feed. Hear about Nestle’s recent presentation at a FAR maize field day, how maize is expanding into Southland with short maturing hybrids and how a Waikato dairy farmer is hitting $9,000/ha operating profit regardless of the payout.

Rex and Sharon Butterworth are focused on running a system that remains profitable regardless of the payout as they make the most of their home-grown feed, which sets their stock up for optimal production. Claire Ashton reports.

There are several benefits of employing a farm consultant.

Waikato dairy farmer Paul MacKenzie is growing 43% of his milking platform in maize. Maize silage is an ideal component for his highly stocked winter milking system, but he told Sheryl Haitana there is always more efficiency to be found. Photos by Emma MaCarthy.

Story by Karen Trebilcock.