BRD 2

Question 1

what aspects of management can you look at when dealing with BRD?

Answer 1

colostrum, pre-weaning nutrition, biosecurity/biocontainment

colostrum is the job of a person, not a cow, on a dairy

Question 1

what are the main environmental risk factors for BRD in dairy cattle?

Answer 1

• calves housed indoors, bad ventilation
• if calves housed outdoors, additional calories (milk) must be provided

environmental risk to adults is low

Question 2

what are the C/S of laryngeal obstruction in adults?

Answer 2

• inspiratory dyspnea and stertor
• excessive salivation (dysphagia induced by laryngeal inflammation)

Question 3

how do you tx laryngeal obstruction in adults?

Answer 3

parenteral Abs, tracheostomy, emergency slaughter, pass stomach tube

Question 4

how do adult cattle get laryngeal obstructions? how do calves get laryngeal obstructions?

Answer 4

adult: secondary to balling gun and drenching injuries

calf: calf diphtheria (honker syndrome, laryngeal necrobacillosis)

Question 5

what are the C/S of laryngeal obstruction in calves?

Answer 5

• anorexia, depression, fever
• characteristic foul necrotic odor to breath
• excessive cellulitis, severe toxemia, resp distress

Question 6

what bacteria is involved with laryngeal obstruction in calves?

Answer 6

Fusobacterium necrophorum

Question 7

how do you tx laryngeal obstruction in calves?

Answer 7

long-trm Abs (oxytetracycline, florfenicol), dexamethasone (life-threatening inflammation), tracheostomy

Question 8

embolic pneumonia in cattle is usually caused by?

Answer 8

CVCT (caudal vena cava thrombosis)

most common C/S

Question 9

caudal vena cava thrombosis causes what in cattle?

Answer 9

epistaxis, anemia, chronic bronchopneumonia

Question 10

what are the C/S of caudal vena cava thrombosis in cattle?

Answer 10

• persistent chronic hemoptysis
• fever
• anemia
• acute death from hypovolemic shock
• epistaxis

Question 11

what bacteria are involved in caudal vena cava thrombosis in cattle?

Answer 11

Fusobacterium necrophorum, Trueperella pyogenes

Question 12

how do you tx caudal vena cava thrombosis (particularly the bronchopneumonia that occurs bc of it)

Answer 12

Abs, furosemide, NSAIDs

but poor px

Question 13

what are the C/S of Salmonella Dublin in cattle?

Answer 13

high fever, tachypnea, dyspnea, septicemia, high mortality

Question 14

why is salmonella Dublin super bad?

Answer 14

Ab resistant, zoonotic, no vax

Question 15

what is the pathology of salmonella Dublin in cattle?

Answer 15

congested lungs, swollen liver, enlarged spleen, bac t easily isolated from affected organs in acute cases

Question 16

how do you dx salmonella Dublin fo sho?

Answer 16

ELISA

Question 17

what is the best control measure for Salmonella Dublin?

Answer 17

biosecurity/biocontainment

Question 18

what are the major risk factors for Mycoplasma bovis in calves?

Answer 18

poor ventilation, group housing and feeding

Question 19

what is important to know about the mycoplasma bovis vax?

Answer 19

it exists

parenteral, live

cannot use a macrolide w/I 14 days of vaccine –> it’ll kill the avirulent strain

Question 20

A TUS score of ____ is consistent w/ bacterial bronchopneumonia

Answer 20

≥3

Question 21

bronchopneumonia reliably localizes to 3 specific lung lobes: which ones?

Answer 21

cranial aspect of R cranial lobe > R middle lobe > caudal aspect of L cranial lobe