The British League Against Cruel Sports has launched a campaign against calf roping at the Calgary Stampede. (CBC)

A British animal rights group has joined a Vancouver Humane Society campaign against calf roping at the Calgary Stampede.

The League Against Cruel Sports, based in Surrey, England, is urging its supporters to write to the Canadian High Commission to voice their opposition to the rodeo event. The group is also asking U.K. travel companies to stop promoting tours to the Calgary Stampede.

Rodeos have been banned in Britain since 1934.

Earlier this week, the Vancouver Humane Society published a $15,000 full-page ad in the Calgary Herald condemning calf roping.

The ad, which appeared in the newspaper's sports section in the days leading up to the Stampede, shows a calf on its side while a cowboy tries to tie its legs with a rope. The text asks: "That's entertainment?"

The Stampede's organizers say they take a "disciplined approach to animal care," and that the Calgary Humane Society and the province's SPCA monitor the activities on-site each year. Both organizations are empowered to enforce Alberta's Animal Protection Act.

The Calgary Humane Society says it's "fundamentally opposed" to rodeo events such as calf roping, but "has found it can best protect the interests of the animals involved by working with organizations that put on such events," according the group's website.

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