What's not on your egg carton

I went down the egg rabbit hole. The stamps, the codes, the producers, the Palace Poultry fraud case, the brand ownership map. I came out the other side with an article I was pretty happy with, and a feeling I'd understood the system.

Then I kept pulling the thread.

Because eggs come from chickens, and chickens eat something, and that something turns out to be one of the more quietly extraordinary stories in New Zealand's food system.

Here is what I did not know until last week.

Almost all of the soy in New Zealand chicken feed — and soy is the protein backbone, the bit that builds the bird and fills the egg — comes from Argentina. Not most of it. Ninety-eight percent. One country, on the other side of the world, feeding the chickens that fill nearly every supermarket fridge in this country.

And Argentinian soy is, overwhelmingly, genetically modified. Engineered for one specific purpose: to survive being sprayed with glyphosate, repeatedly, through the growing season. The genetic modification isn't there to make the bean more nutritious or more resilient or more anything you might want in a food. It's there so the field can be sprayed harder, more often, without killing the crop.

So the chicken eats GM soy. Sprayed with glyphosate. Then it lays an egg, and the egg goes in the carton, and the carton goes on the shelf, and you take it home.

And here is the bit I sat with for a while, because it was somehow worse.

This isn't only an egg story. Every meat chicken in the country — the supermarket roast, the takeaway, the nuggets, the school lunch, the chicken in pretty much every pie, sandwich, salad and stir-fry sold in New Zealand — grew up on the same feed. From hatch to slaughter. Around six weeks of GM soy, sprayed with glyphosate, the bird eating it constantly, the bird being it constantly, because that's what bodies do with food. They turn it into themselves.

You are what you eat. And what you eat ate something too.

Here is the part that genuinely surprised me. New Zealand does not grow GM crops commercially. Public sentiment against GM has been consistent for twenty years. And yet GM soy is in the daily diet of nearly every chicken in this country, and there is nothing on any label to tell you.

The reason is a definitional move that took me a while to get my head around. Under joint Australia–New Zealand food law, an animal fed GM plants is not considered a GM animal. The chicken isn't GM. The egg isn't GM. The meat isn't GM. The feed was, but the feed isn't on the label. The GM input gets, in effect, laundered through the bird.

Producers can't claim the products are GM-free either. The Commerce Commission has been clear that this would breach the Fair Trading Act when the birds have knowingly been fed GM ingredients. So the carton, the tray, the rotisserie bag all sit in a strange middle zone. Not labelled GM. Not allowed to be labelled GM-free. The shelf gives you nothing.

I keep coming back to the simplest framing of this. If the bird spent its life eating soy that was sprayed with glyphosate, that's part of the story of the egg, and part of the story of the meat. It's not the whole story. The cage versus barn versus free range question still matters. The welfare question still matters. The way meat chickens are bred to grow so fast their legs can barely hold them still matters. But it's a layer of the story that most people, including me until very recently, have absolutely no idea is there.

So what do you do with that.

The honest answer is that there is barely a way out of this supply chain at the meat counter. Certified organic chicken in New Zealand is a tiny category — one or two producers, scarce on shelves, expensive when you find it. I'll come back to who's actually doing it, and what it costs, in a follow-up piece.

Eggs are a little easier. Certified organic eggs come from more than one producer, and the certification standard prohibits GM feed. But the shelf-share is tiny, the price gap is real, and most people have never been told there is anything to choose between in the first place.

There's more I want to know. About the glyphosate itself, about the companies behind it, about how this system got built. I'll come back to those questions soon.

But I wanted to write this down now, while the surprise is still fresh, because I think the surprise is the point. I have been researching the New Zealand food system pretty intensively for months. And I did not know this. If it wasn't on my radar, it probably isn't on most people's either.

This article is part of OFT's eggs series. The full guide to New Zealand's better egg producers — sorted by how they farm, with regional buying tips — lives at Eggs in New Zealand.