SASKATOON -- The Canadian Wheat Board is standing by an advertisement that has lassoed controversy.

The ad features a 1969 print showing a young woman in a cowboy hat and skirt straddling a fence.

The caption asks: "Still on the fence?" and encourages farmers to choose the wheat board for marketing grain.

But the National Farmers Union is questioning what an image of a long-legged woman straddling a fence has to do with selling grain.

Joan Brady, who heads the women's branch of the farmers union, says the image is used inappropriately.

She says it dismisses women who actually run farms and are the ones to decide whether to purchase contracts with the wheat board.

Dayna Spiring, the wheat board's chief strategy officer, says the ad is meant to be edgy and provocative.

She says there's no intention to offend anyone and the wheat board plans to continue running the ad.