Feed Lot

NOV 2018

Feedlots and cow/calf operations in the beef industry who feed 500 or more has annually on grains and concentrates; maintain 500 or more beef cows; backgrounder, stocker/grower, preconditioner; veterinarian, nutritionist, consultant

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12 FEED•LOT November 2018 a pour- on insecticide to take care of the biting lice." A l w a y s r e a d a n d f o l l o w l a b e l directions when using dewormers and insecticides for control, Banta said. Any new cows or bulls should be treated prior to introduction to the herd, Banta said. "After the treatment regimen, your cattle will typically be in good shape until the next fall or winter," he said. However, if you live in a cold- er climate with a longer winter, producers should be vigilant in checking animals regularly. In ar- eas with longer lice seasons, a second treatment may be needed later in the year. FL Lice can suck the profit out of your bottom line in the fall and winter. Although lice can infest cattle throughout the year, Dr. Jason Banta, Texas A&M AgriLife Extension Service beef cattle spe- cialist says infestations are worse in the colder months. "As the weather gets colder, cows grow longer, thicker hair and that produces better cover and protection for lice, which means the lice have better reproductive rates," he said. There are two types of lice that affect cattle herds, Banta said – biting lice and sucking lice. "Lice will cause reduced ap- petite in a herd, which means re- duced performance," he said. "It's important to be aware of the pest this time of year." Lice can also reduce red blood cells by 75 percent, and animals with heavy infestations can be- come anemic, Banta said. They are transmitted through physical contact between cows, he said. Breaking the pests' life cycle is the key to lice control. Timing and product selection are important for treat- ment. Several product options are available to control lice. Most kill adult lice, but only a product with an insect growth regulator (IGR) can also kill the lice eggs. Many control methods will take two treatments before the life cycle is broken, Banta said. If using traditional in- secticide like a permethrin-based product, an initial insecticide ap- plication should be made to knock down existing lice populations. Another application two to three weeks later is necessary to kill the adults that emerge from the eggs not killed by the original treatment. There are products available that include an IGR that require only one treatment. Additionally, certain pour-on dewormers only need to be applied once for season long control, Banta said. "If you go with an injectable de- wormer for internal parasites, it's important to know they only get the sucking lice and won't control bit- ing lice," he said. "If they use inject- able dewormers, make sure you use COW/CALF CORNER INFORMATION FROM TEXAS AGRILIFE EXTENSION Tips for Effective Lice Control • Check cattle for the presence of lice in late summer or early fall. If lice are found, all animals should be treated • Treat strategically to prevent small, undetectable infestations from LQFUHDVLQJDQGEHFRPLQJGLIÀFXOWWRFRQWUROHYHQLIQROLFHDUHVHHQ • ,GHQWLI\WKHW\SHRIOLFH²ELWLQJRUVXFNLQJ,IOLFHFDQ·WEHLGHQWLÀHG treat with a product labeled for both • Apply the correct, full dose to each animal based on bodyweight • Apply product to the poll (head) as well as along the backline, when indicated • Consider a product with an IGR to save labor and treat only once • Keep newly treated and untreated animals separate from previously treated animals until the treatments have time to work • Consider use of a mid-season treatment, especially in colder areas where the lice season may be longer Watch For a Lousy Situation This Winter Successful treatment requires proper application strategy and management

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