If your heifers or cows are on pasture, be aware of liver flukes.

Liver flukes are an internal parasite that negatively impact average daily gain, feed efficiency, and have been shown to delay the onset of puberty in heifers, says John Melancon, technical services veterinarian with Merial.

Producers and veterinarians may diagnose liver flukes as roundworms, because the two share similar symptoms. However, the treatment used to control roundworms will not work on liver flukes.

Talk to your veterinarian if you live in one of the 24 states, highlighted in the map below, where liver flukes have been found. Symptoms for cattle that have been on pasture include: poor growth rates, rough hair coats, loss of appetite, weakness or jaundice.