There’s fowl play afoot between the buns of Subway sandwiches, a new report claims.

The fast food chain’s “chicken” contains only about 50 percent actual chicken DNA — and most of the rest is soy filler, according to researchers who conducted lab tests in Canada.

The restaurant’s oven-roasted chicken contains a mere 53.6 percent chicken, according to the DNA tests, and its chicken strips contain about 42.8 percent, the investigation by the Canadian news outlet CBC Marketplace found.

Test results left a bad taste in the mouths of customers, who called it dishonest to label the meat chicken — when it’s basically half vegan.

“That’s misrepresentation,” fumed Toronto resident Irena Valenta.

For the Ontario-based study, Matt Harnden of Trent University conducted biopsies on five pieces of oven-roasted chicken and five chicken strips, which are found in Subway wraps, according to the report.

Researchers also tested four other fast food restaurant chicken and found higher percentages of poultry DNA.

A&W’s Chicken Grill Deluxe, for example, averaged 89.4 percent chicken DNA, while McDonald’s Country Chicken weighed in at 84.9 percent, the news outlet claimed. Wendy’s Grilled Chicken Sandwich scored 88.5 percent and Tim Hortons’ Chipotle Chicken Grilled Wrap averaged 86.5 percent.

By contrast, grocery store chicken is generally 100 percent, researchers said.

A total of 50 ingredients, including honey, onion powder and some government-approved industrial chemicals, were found in chicken from five fast food restaurants, according to CBC.

The sandwich switcheroo bites for loyal customers, said Will Mahood, a regular at Subway.

The firm makes it look like the chicken comes “straight from a farm” and is “a fresh piece of meat,” he said.

Subway fired back Tuesday, saying the Canadian findings were way off the mark. “The accusations made by CBC Marketplace about the content of our chicken are absolutely false and misleading. Our chicken is 100 percent white meat with seasonings, marinated and delivered to our stores as a finished, cooked product,” the company said.

“We have advised them of our strong objections. We do not know how they produced such unreliable and factually incorrect data, but we are insisting on a full retraction.”

Earlier in the week, Subway said, “Our chicken strips and oven roasted chicken contain 1 percent or less of soy protein. We use this ingredient in these products as a means to help stabilize the texture and moisture.”