Milk hormone faces growing opposition

 作者:容嘌劭     |      日期:2019-03-08 01:05:03
By Andy Coghlan CANADA has banned bovine somatotrophin (BST), a genetically engineered growth hormone that increases milk yields when injected into dairy cows. A panel of veterinary experts appointed by the Canadian government concluded that mastitis, an udder infection, is 25 per cent more likely to occur in cows treated with the hormone. Treated cows are also 18 per cent more likely to be infertile and 50 per cent more likely to become lame. Monsanto of St Louis, Missouri, which makes BST, claims the panel unfairly included data on experimental versions of the hormone made by other companies. “It’s like comparing apples and oranges,” says company spokesman Gary Barton. But Ian Dohoo of the University of Prince Edward Island, who chairs the Canadian panel, says the conclusions stand up even if the Monsanto data alone are considered. Since its launch on the US market in 1993, BST has been one of the biotech industry’s most controversial products. The European Union has imposed a moratorium on its sale, arguing that its use would drive small farmers out of business. This expires in January 2000,