BRD Post Weaning COPY COPY COPY

Question 1

What is the objective of a Stocker / Backgrounder?

Answer 1

• Prepare calves for next phase through economic gain
• Stocker: forage
• Backgrounder: carbohydrate

Question 2

What is the objective of a feedlot

Answer 2

gat calves to harvest weight

Question 3

How frequently does BRD affect feedlots?

Answer 3

• Primary animal health challenge in feedlots
  
  • 75% of all feedlot morbidity
• BRD reported in 96.9% of feedlots

Question 4

How does BRD impact performance?

Answer 4

• Average daily gain decreases
• Live weight / HCW
  
  • decreased final body weight
  • decreased hot carcass weight
• Quality grade - reduced percent choice

Question 5

What are the economic impact of BRD?

Answer 5

• affects health, performance, carcass impacts
• 23-54 / head to treat
• total cost 45 - 92 (when add in carcass costs)

Question 6

What factors affects the risk of calves to BRD?

Answer 6

Question 7

How does commingling increase BRD risk?

Answer 7

• Commingling shown to increase morbidity
• Cattle from multiple sources 2x likely to be BRD case

Question 8

How does transport affect BRD risk?

Answer 8

• Stress
  
  • modifies acute phase protein response
  • Increase cortisol/transient activation of hypothalamic-pituitary-adrenal
• Immune function
  
  • decrease in leukocytes
• Short haul (12hrs) ⇢ higher morbidity and mortality compared to long haul (24hrs)
• Each additional 100 miles traveled increased BRD risk by 10%
• Impact greater in light weight
  
  • BRD risk increased up to 888km

Question 9

How does weather impact physiologic response and BRD risk?

Answer 9

• Highest BRD incidence in fall:
  
  • due to weather / cattle flow

Question 10

What is important to keep in mind when providing a case definition for BRD?

Answer 10

• Consistent / repeatable
• Accurate
• Subjective
• Objective

Question 11

How is first treatment success measured? why?

Answer 11

• Calculated as success/failure
• Evaluates:
  
  • Therapeutic selection
  • Diagnostic process
• Target 75-85% 1st treatment success

Question 12

What is Case Fatality Risk (CFR)?

Answer 12

• BRD specific CFR
  Modification: dead to pull risk (percent)
• Evaluates:
  
  • therapeutic selection
  • Diagnostic process
• Target: 6-12% CFR

Question 13

What are Post- and Inter-treatment intervals based on?

Answer 13

• Protocol
• Pharmacology
• Treatment response
• Type of cattle
• PTI - Prescribed minimum time between treatments
• ITI - actual time between treatments

Question 14

Given a BRD CFR and First Tx Response rate, what interpretations can be made?

Answer 14