BOVINE RESPIRATORY DISEASE COMPLEX. Kristen Mierzwiak LCS 630
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1 BOVINE RESPIRATORY DISEASE COMPLEX Kristen Mierzwiak LCS 630
2 Ring... You are called out to the farm of one of your regular dairy clients because some of the replacement heifers they bought at a public auction in Tennessee one week ago are now sick and a few are dead. When you arrive at the farm, you find that about a third of the group is affected with increased respiratory rate and effort and harsh lung sounds.
3 Since a few of them have recently died, you do a necropsy and find which makes you highly suspicious of Bovine Respiratory Disease Complex
4 So what is BRD? Formerly known as shipping fever because of it s association with transportation, although this is really no longer a major cause. Also known as undifferentiated bovine respiratory disease or undifferentiated fever. Overall, it describes cattle that are febrile with dyspnea, coughing, nasal discharge, varying degrees of depression, inappetence to anorexia and evidence of pneumonia on thoracic auscultation. It usually manifests and severe, acute, fibrinopurulent or fibrinonecrotic pneumonia, and is often fatal. Usually occurs about 7-10 days after assembly at a feedlot.
5 Atypical Interstitial Pneumonia Uncommon manifestation of BRD Associated with epidemics of Bovine Respiratory Syncytial Virus Consists of bronchitis and bronchiolitis of the cranioventral lung lobes combined with widespread edema and emphysema BRSV infection in the cranioventral lung lobes and accompanying cytopathologic findings are not thought to cause the widespread edema and emphysema, but an immune-mediated mechanism might play a role.
6 Factors associated with disease Stressors Weather, castration, weaning, vaccination, transportation, dehorning, ear tagging, new social groups, etc. Loss of body weight (shrink) Common in shipped cattle and cattle in hot environments due to fasting, and loss of fluid and electrolytes from the GI tract without usual replacement. More than 7% total body weight lost increases the risk of health problems.
7 Factors of disease (continued) Level of immunity Preconditioning (helps protect against disease) vaccinaton, castration and weaning of calves before shipping to establish good immunity and space out stressful events. Persistently infected calves infected at birth or in utero with BVDV which causes chronic immunosupression and places them in a position to show other diseases clinically and infect other cattle, decreasing herd immunity. Age Morbidity and mortality of BRD are much lower in yearlings than in calves. Commingling New pathogens and new social structure at the same time
8 Common Pathogens: Bacteria *Note: infections involving multiple organisms are the RULE rather than the EXCEPTION* Mannheimia haemolytica Pasteurella multocida Mycoplasma bovis, dispar Haemophilus somnus Arcanobacterium pyogenes (chronic infections and abscessations)
9 Common Pathogens: Viruses *Note: infections involving multiple organisms are the RULE rather than the EXCEPTION* Bovine Viral Diarrhea Virus (BVDV) Infectious Bovine Rhinotracheitis (IBR) Parainfluenza type 3 (PI3) Bovine Respiratory Syncytial Virus (BRSV) Bovine Herpes Virus 1 (BHV-1) Bovine coronavirus (usually an enteric pathogen)
10 Treatment and clinical management Identifying and removing affected cows to the sick pens is the most important step. Antibiotics such as sulfadimethoxine, oxytetracycline, and ampicillin can be given daily for at least 3 days as initial treatment when no culture is taken. Florfenicol is also effective at two doses of 20mg/kg 48 hours apart. Virus isolation from nasal swabs. Antemortem culture and susceptibility testing of serum or blood with appropriate antibiotic therapy. Postmortem culture and susceptibility testing, followed by appropriate treatment of remaining clinically affected animals.
11 Control of disease Successful integration of management techniques is essential. Vaccination against Pasteurella bacterins and respiratory viruses Stress minimization Good ventilation and protection from the elements Resting periods during shipping where good quality hay and water is available. Grouping cattle by age and size Metaphylaxis
12 Metaphylaxis Objectives: Administer antibiotic to BRD susceptible cattle in order to reduce morbidity and mortality, improve performance, reduce hospital crowding, and improve profits. Antibiotic is given orally in feed or water or parenterally. A study from the AABP annual conference from 2009 showed no advantage to adding oral chlortetracyline to the rations of calves metaphylactically treated with parenteral tulathromycin
13 What to tell your client Separate clinical heifers and treat with antibiotic that covers cultured bacteria from necropsied cow. 5-10% of affected cows are expected to die. In the future, buy heifers directly from one or two farms with good calf health programs. Improve ventilation and avoid overcrowding Preconditioning calves from the farm can increase profit as well.
14 And in the feedlot setting... Preconditioned, uniform and older animals gain better and typically have a higher growth yield with fewer health problems overall. But they also come with a higher purchase price and higher feed cost per unit gain. So profit margin is often smaller than for calves coming from public auction sale yards. However, their risks are greater.
15 Works cited Kahn, Cynthia M. ed, et al. The Merck Veterinary Manual, 9 th edition. Copyright 2008, Merck & Co., Inc. Martin SW, et al: A group level analysis of the associations between antibodies to seven putative pathogens and respiratory disease and weight gain in Ontario feedlot calves, Canadian Journal of Veterinary Research 53: ,1990 Radostits, Otto M., Heard Health; Food Animal Production Medicine, 3 rd edition. Copyright 2001 by W.B. Saunders Company Radostits, Otto M. et al. Veterinary Medicine: a Textbook of the Diseases of Cattle, Horses, Sheep, Pigs and Goats, 10 th edition. Copyright 2007 by Elsevier. Wallace, Justin O. et al: Effects of Concurrent Metaphylaxis with Chlortetracycline and Tulathromycin on the Health and Performance of High-risk Beef Calves, 42 nd AABP annual conference publication, 2009
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