BILLINGS, Mont. (AP) -- Montana's state veterinarian is recommending brucellosis vaccines for all sexually intact female calves, saying it is necessary to control disease and keep the cattle marketable.

Marty Zaluski told producers at Billings' Public Auction Yards that mandatory statewide vaccination would bring Montana in line with measures already taken in Wyoming and Idaho.

Ranchers in the three states have been harmed by instances of brucellosis in herds that graze near Yellowstone National Park. Brucellosis is carried by elk and bison in the area and can cause cows to miscarry.

Some ranchers have argued that the $5 shot isn't necessary, while others argue the shots can wait until an animal is selected for breeding.

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Information from: Billings Gazette, http://www.billingsgazette.com

Copyright 2010 The AP.