The Colorado Department of Agriculture reminds cattle owners to test their herds for bovine trichomoniasis.

As of April 25, there were two positive trich locations in two Colorado counties: La Plata and Park.

So far this year, there have been three locations in the state.

A map detailing trichomoniasis sample submissions by county and the prevalence for trichomoniasis-positive counties can be found at www.colorado.gov/ag.

In 2012 there were 12 positive locations in 8 counties; 2011 saw 143 locations in 8 counties. The highest number in recent years has been 43 locations in 17 counties in 2008.

"Testing and monitoring herds for trichomoniasis is the best method of controlling this infection," said Keith Roehr, state veterinarian. "Cattle owners should talk to their veterinarians to determine the best management practices for their herds."

Trichomoniasis is a venereal disease of cattle caused by Trichomoniasis foetus.

The infection causes fertility problems such as early embryonic death or abortion of the calf. T. foetus is asymptomatic in bulls, but if bulls become infected, the percentage of open cows can increase from 5 to 30 percent. The disease can affect both beef and dairy cattle.

Colorado trich regulations require all non-virgin bulls changing ownership or being transported into Colorado to be tested for T. foetus unless the animal is going to slaughter.

Bulls on public land grading permits or with grazing associations must be tested prior to turn-out.

Several diagnostic labs across the state offer trich testing.

Samples must be taken by an accredited veterinarian.

For testing questions, call a local large-animal vet or the Colorado Department of Agricultural Animal Industry Division at (303) 239-4161.