"The sample of one brand . . . was more than a quarter horse", says the story here:
The scandal began in Ireland in mid-January when the country . . . announced the results of its first-ever DNA tests on beef products. It tested frozen beef burgers taken from store shelves and found that more than a third of brands at five supermarkets contained at least a trace of horse. The sample of one brand sold by British supermarket kingpin Tesco was more than a quarter horse.