By Rod Nickel WINNIPEG, Manitoba (Reuters) – Ranchers in western Canada whose herds are under quarantine due to the spread of bovine tuberculosis told federal legislators on Tuesday that they desperately need to sell cattle or collect compensation to avoid financial disaster. Ranchers who raise calves typically sell them in autumn to feedlots, where they are fattened to slaughter weight. The federal Canadian Food Inspection Agency (CFIA) has confirmed six cases of Alberta cattle with bovine TB, dating back to the September discovery of an infected cow at a U.S. slaughter plant.