Now the company has turned its sights to the United States, where there are signs that it may be gaining some traction.
Data from Nielsen Retail Measurement Services for the week ending July 28 shows that sales of traditional milk products in the US dropped 4 per cent, year-over-year to $227m.
Conversely, sales of milk alternatives are up 8 per cent over the same period, reaching nearly $35m.
Not all traditional milks have struggled, Nielsen said.
"During the week, Maola Milk & Ice Cream Co, Grupo Lala S.A. and The a2 Milk Company had the highest rise in dollar sales compared to a year ago," it said.
The consensus market forecasts for a2 Milk's result is for a net profit of $190m for the June year.
Shareclarity has a net profit forecast of $206m because it does not expect a2 Milk's tax rate and tax provision to be as high as the market's expectation.
A2 Milk has already said that it expects its revenue for the June year to come in at around $922m, representing growth on the prior corresponding period of 68 per cent.
The year to date has seen some big changes at a2 Milk.
Chief executive Jayne Hrdlicka has taken over from Geoff Babidge, and the company has teamed up with the world's biggest dairy exporter — Fonterra — to jointly market a2 milk in New Zealand under the Anchor brand.
A2 Milk's share price lifted sharply on the Fonterra tie-up but moves by Nestle's to launch an A1 beta-free product in China saw the price take a big knock back in March.
Early this month, a2 Milk said it had spent $161.8m on an additional 8 per cent stake in Synlait from Japan's Mitsui, taking its holding to 16 per cent.
Shareclarity managing director Daniel Kieser sees the move as being significant, as a2 Milk will now have a "blocking stake" in one of its two New Zealand suppliers.
"Synlait can no longer be sold without a2 Milk's approval, which means it has better security of supply," he said.
"More importantly, it will keep the pricing pressure between Fonterra and Synlait," he said.
With a 16 per cent shareholding, a2 Milk will get at least one Synlait director, he says.
"And while they may be conflicted out of making decisions that involve a2 Milk, they will get Synlait's operational and market insights," he said.
"This could be especially valuable in the United States where both companies are trying to go," Kieser said.
Retail madness
It appears the rumoured death of retail has been greatly exaggerated.
One of the country's long-standing clothing retailers, Hallenstein Glasson, has advised that its sales for the year to August 1 were up 16.2 per cent to $277.6m.
In a trading update, Hallenstein said its net profit after tax is expected to be within the range of $27.10m to $27.60m, up 58 per cent over the previous year's.
The group's balance sheet remains strong and future cash flow is projected to be positive, it said.
Hallenstein Glasson's shares have had a phenomenal run. The stock last traded at $5.54 — a $2.20 or 66 per cent gain over the last 12 months.