A professor from the University of Guelph's food institue says Canada's dairy sector could be losing more than first announced under the Trans Pacific Partnership Agreement.

Professor of Distribution and Food Policy, Sylvain Charlebois says he was surprised to see not only fluid milk included in the deal, but also yogurt, cheese, and processed products. He says with this in mind, the market loss would be closer to four percent, rather than three point two-five percent, as previously announced.

"If they compare a metric ton of fluid milk with a metric ton of mozzarella because mozzarella you need eight litres of milk to produce one kilo of mozzarella. So, you are actually talking about two very different things . I don't know how they came up with the three point two-five  percent at this time."

In terms of supply management, Charlebois says numbers on dairy don't add up to what former Prime Minister Stephen Harper announced during the election.

"So we varied our fourteen or fifteen different categories including soy milk, skim milk, cheeses like mozzarella, industrialized cheeses and yogurt. When you add all the numbers up, the metric ton, I just can't figure out how the government is actually coming up with the frequent three point two-five percent after five years."

Charlebois says the difference many not create a tsunami overnight, but it creates a breach in the fundamentals of supply management.

Charlebois says if you look at Canada's annual production, the market loss would be closer to four per cent.