BRDC and sick calves

Question 1

what are our bacterial agents of BRDC

Answer 1

manheimia hemolytica, pasteurella multocida, histophilus somnus, mycoplasma bovis

Question 2

most economically important disease in feeder cattle

Answer 2

BRDC- not only deaths but decreased gains, decreased carcass value.

Question 3

three major factors of BRDC

Answer 3

weather, nutrition, stressors

Question 4

when does the clinical signs of BRDC surface

Answer 4

7-21d post shipping/stress

Question 5

how does the bacteria infect

Answer 5

virus destroys the cells in the lungs, bacteria migrate to the lungs and set up shop, leukotoxin causes inflammation, destroys lung tissue, lung tissue calls more WBC, which get killed by leukotoxin, spiral

Question 6

what is our death loss goal for stocker production

Answer 6

less than 4% loss

Question 7

which factors are most important in preventing brdc

Answer 7

what calves you purchase, nutrition, other stressors (presconditioning, bulls vs steers).

Question 8

what is preconditioning

Answer 8

vaccination before shipping (14-21d prior to stressor), weaned,
bunk broke

Question 9

what is the gold standard amount of time to wean

Answer 9

45days pre stressor

Question 10

what are the preconditioned vaccines

Answer 10

IBR-BVD (at least one MLV)
mannheimia
blackleg- 7way
14-21 days prior

Question 11

why is MLV preferred for the IBR-BVD vax

Answer 11

MLV stimulates more than one part of the immune system

Question 12

what are the best calves to sell

Answer 12

weaned calves, vaccinated and from one farm, calves comingled prior to sale

Question 13

farm receives gold star calves, what do we want the producers to do now

Answer 13

parasite control +- implants

Question 14

what calves would benefit from metaphylaxis

Answer 14

stale, sale barn calves. cheap, been from multiple markets

Question 15

when does BVD PI calves become PI

Answer 15

infection 40-125 days

Question 16

what increases your likelihood of buying a BVD PI calf?

Answer 16

the more calves you buy, it increases the likelihood

Question 17

how do we test for BVD PI calves

Answer 17

ear notch. elisa

Question 18

what does a positive BVD test mean

Answer 18

you have a PI calf
you have a transient infection
you have a false positive test

Question 19

four inidications for metaphalaxis

Answer 19

on arrival if you expect >33% of calves to get sick

if you already treated >15% in one day

treated greater than >25-30% of calves on three consecutive days

Question 20

bottom line for steers vs bulls

Answer 20

bull calves get sick more than steers
bull calves gain les than steer calves