Fonterra Cooperative Group has followed through on its work into the impact of palm kernel expeller on the composition of fat in the milk it collects with a grading system that will start in September 2018.
The new system follows consultation with farmers and is the latest step in Fonterra's efforts to reinforce its Trusted Goodness logo, which is designed to appeal to consumers who want sustainable and ethical practices in food production and is underpinned by New Zealand's "natural, grass-fed advantage".
But Fonterra's research has shown that PKE also has implications for dairy product manufacturing and sales in global markets of products such as butter.
Fonterra accounts for one-third of PKE imports, which it sells through its Farm Source stores, but conducted feed trials to better understand what impact its use has on milk fat, which is made up of at least 300 fatty acids.
The company focussed on 30 of the most prominent fatty acids and concluded that high rates of PKE use "change the amounts and the ratios of these fatty acids".