OABP Conference 2008 Interactive Disease Investigations

This is how calves are moved from the calving pasture to the turnout pasture on this large ranch in Alberta.

The calf is less than 24 hours old.

How does the heifer know it is her calf?

1. Sight and smell 2. Sight and sound 3. Location and sight 4. Smell and sound 5. Smell and location

What is the pathogen?

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5.

The pneumonia pictured in the previous slide Is a common cause of death in yearling cattle in the feedlot Only seen in feedlots which have greater than 10,000 head Can be effectively controlled by vaccination with a killed bacterin Has been associated with an acute Bovine viral diarrhea virus infection.

Is easily treated with florfenicol or other broad spectrum antibiotics.

This yearling feedlot heifer was pulled by the treatment crew today. She has been on feed for 200 days and has not been previously treated.

The most likely diagnosis is:

1. Lungworm 2. Undifferentiated BRD 3. H. somni myocarditis 4. Feedlot interstitial pneumonia 5. Calf diptheria

This calf was born about 24 hours ago to a first calf heifer.

The producer used a calving jack to extract the calf.

The calf is now breathing rapidly and the producer believes it has respiratory disease.

Which of the following diagnoses is the least likely?

1. Enzootic pneumonia 2. Fractured ribs 3. Aspiration pneumonia 4. Metabolic Acidosis

A mature dairy cow dies of pneumonia and these are the lung lesions at necropsy

The most likely diagnosis is:

1. Honker syndrome 2. Post venal caval thrombosis syndrome 3. Histophilus somni pneumonia 4. Mycoplasma bovis pneumonia 5. BRSV pneumonia

It’s fall on a large ranch located in the interior of British Columbia.

The cows have just been brought off the mountains down to the valley.

This cow has:

1.

Fog Fever or Atypical Interstitial Pneumonia 2. Shipping Fever 3.

Honker’s syndrome 4. Infectious Bovine Rhinotracheitis 5. Lost her calf

A feedlot calf who has been on feed for 56 days dies suddenly in the pen.

It has never been treated before.

The most likely diagnosis is:

1. Mycoplasma bovis pneumonia 2. Mannheimia hemolytica pneumonia 3. BRSV pneumonia 4. Mycoplasma bovis pleuritis 5. Histophilus somnus pleuritis

A yearling feedlot animal is brought in by the treatment crew.

This yearling has:

1. Shipping fever 2. Histophilus myocarditis 3. Rt. Sided heart failure 4. IBR 5. BRSV

This calf was born with a mass protruding from it’s skull It is able to stand and has normal behaviour.

What is your diagnosis?

1. Tumour 2. Tissue protruding from anterior sinus 3. Meningocoele

Does the Bull see the colour red?

1. Yes 2. No

Team Scores

541.67

475 Boehringer Customer Boehringer Employee

What weed caused this problem?

1. Fanweed 2. Stinkweed 3. Lupins 4. Marsh arrow grass 5. Poison hemlock

Sudden death on Canola stubble • Shortly after being turned out on a field of Canola stubble • Cows become recumbent • Excessive salivation, dilated pupils • Diarrhea • Bloat

Most likely diagnosis?

1. Organophosphate toxicity 2. Nitrate toxicity 3. Lead toxicity 4. Prussic acid poisoning 5. Urea toxicity

Abnormal calves at birth

• 30% of the calf crop of this commercial herd in Alberta are affected • Calves appear to have skeletal abnormalities • Calves are smaller than normal and have joint laxity • Many affected calves fail to survive

This problem is caused by a:

1. 1,25 dihydroxy vitamin D deficiency 2. Zinc deficiency 3. Manganese deficiency 4. Mycotoxin 5. Moldy straw

Colic in Adult Cows

• 500 cow herd in early December • Recently began feeding from 2007 alfalfa silage pile • This silage has a significant amount of spoilage • Also feeding barley, canola and pea straw • Barley straw is 4 yrs old and very moldy • 30-50 cows affected with clinical signs • Dull, off feed, kicking at bellies, hunched backs, walking slowly, 7 cows are down, 2 have diarrhea, 1 death

The most likely cause of this problem is: 1. Mycotoxins in silage 2. Inadequate protein/energy 3. Inadequate calcium in ration 4. Foreign material impaction 5. Inadequate phosphorus

Sudden death post-weaning

• 250 cow herd which weans in December • 1 week after weaning, 12 calves die within a 4 day period • Some of the calves have severe diarrhea prior to death • Oral and esophageal ulcerations are evident

This outbreak could have been prevented by: 1. Using BVD MLV at branding in calves 2. Using BVD MLV at weaning in calves 3. Using BVD MLV prebreeding in cows 4. Using Killed BVD vaccine at pregnancy diagnosis in cows

What could have prevented this problem?

1. Better penriders 2. Metaphylaxis 3. BVD vaccine 4. Clostridial vaccine 5. Anthrax vaccine

Feedlot cattle with poor gains

• 2000 head backgrounding feedlot • Cattle arrive in October at 600 lbs • Owner notices poor feed consumption, low weight gains, excessive salivation • Approximately 80% of feedlot is affected • Do not respond to antibiotic treatments • Oral lesions are evident in cases

What is the most likely diagnosis?

1. Acute BVD 2. Foot and mouth disease 3. Foxtail awn stomatitis 4. Malignant catarrhal fever 5. Mycotoxins

Cow herd with oral lesions

• Slobbering, smacking lips • Oral ulcers • Shivering • Sore feet • High temperature

What is your diagnosis?

1. BVD 2. Foot and mouth disease 3. Foreign body stomatitis 4. IBR 5. Papular stomatitis

Calves with hair loss

• 3 calves in herd of 150 with significant hair loss • All treated with endectocide one month previously • No response to treatment

What is your diagnosis

1. Chorioptic Mange 2. Psoroptic Mange 3. Genetic problem 4. Biting Lice 5. Sucking Lice

80% of calves in this feedlot pen have conjunctivitis in December There has been no response to treatment What is your diagnosis?

What is the pathogen?

1. Mycoplasma conjunctivitis 2. Moraxella bovis conjunctivitis 3. Neisseria conjunctivitis 4. Chlamydia conjunctivitis 5. IBR conjunctivitis

5 cows found dead suddenly all within 25 yards of this lick tank

What is your diagnosis?

1. Anthrax 2. Lightning 3. Blackleg 4. Urea toxicity 5. Lead toxicity

Which came from the chronic pen?

Which of the previous lesions came from the chronic pen?

1. Lesion A 2. Lesion B 3. Lesion C