Feed Lot

DEC 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

Issue link: https://feedlotmagazine.epubxp.com/i/1054205

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Page 6 of 31

FEED•LOT December 2018 7 when HS leaves the lungs and lands in the brain, heart and joints. Com- ponents of the HSDC include: 5DSLGO\)DWDO3QHXPRQLD Some animals with HS pneu- monia are simply found dead due to a rapidly fatal type of damage to the lung called "severe fibrin- ous pleuritis." Currently, this is the most common manifestation of HS in western Canadian feedlots and is seen 30-90 days after arrival. Rarely are abnormalities found in any other organ besides the lungs which are covered in a thick sheet of fibrin and the lungs are often remarkably collapsed underneath. %URQFKRSQHXPRQLD Some calves with HS develop typical signs of BRD including depression, separation from the group, off feed, cough, excessive nasal discharge and difficult or rap- id breathing. Respiratory signs with fever of 104°F or above confirms the diagnosis of BRD but detection Diarrhea virus (BVD), Parainfluen- za 3 virus (PI3), Bovine Respiratory Syncytial virus (BRSV) and possi- bly another agent commonly found, Bovine Coronavirus (BCV). Viruses are known to damage the lining of the respiratory tract and some will actually suppress the immune system, allowing sec- ondary bacterial infection. Once es- tablished in the lung, the bacterial components are responsible for the inflammation and bronchopneu- monia signs seen with BRD. Com- binations of different bacteria can work synergistically to cause more severe disease than if operating alone. There are no early clinical signs that indicate Histophilus is part or all of the disease problem, other than it occurs later after ar- rival than most cases of BRD. The Histophilus somni Disease Complex (HSDC) is a term used to describe the respiratory disease when HS reaches the lungs and the complications from "septicemia," of the bacteria and/or viruses in- volved must be done at a diagnos- tic laboratory. Treatment is often unrewarding in the field although in the laboratory, the bacteria is susceptible to many antibiotics. +HDUW0XVFOH'DPDJH HS can cause a "necrotizing myo- carditis" when it localizes in the muscles of the left ventricle of the heart. Death can be rapid with no previous signs (a heart attack) or chronic forms lead to "poor doers." 70( Thrombotic meningoencephali- tis-myelitis or "TME" is a disease of older calves and yearlings affecting the brain. During an outbreak, indi- vidual cases occur sporadically in separate pens in a feed yard. Signs include depression, fever, blind- ness, coma and death; this can look similar to signs seen with polioen- cephalomalacia or "brainers." Treat- ment is most often unrewarding. Call 800.466.1146 today or visit AgLoan.com A part of the Farm Credit System. Equal Opportunity Lender. We see things from the ground up, all of the small details that go into the big picture of ranching. Because agriculture is what we know, it's all we do. AG I S O U R M I D D L E N A M E Molly Beckford Giles Ranch Ashland, KS X

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