Transcript Slide 1

Reproductive Diseases
of Cattle
Floron C. Faries, Jr., DVM, MS
Professor and Extension Program Leader for Veterinary
Medicine
Texas AgriLife Extension Service
Texas A&M System
Reproductive Diseases
 Bacterial
 Brucellosis (Bang’s)
 Leptospirosis (Lepto)
 Vibriosis (Vibrio)
 Viral
 Infectious Bovine Rhinotracheitis (IBR)
 Bovine Viral Diarrhea (BVD)
 Protozoal
 Trichomoniasis (Trich)
 Neosporosis (Neospora)
Bovine Viral Diarrhea
(BVD)
BVD Infection during Pregnancy
infertility
repeat breeding
d0
d 58
congenital defects
immune response
d 90
d 125
d 150
persistent infection
abortion, stillbirth
d 283
HOW TO MAKE A PI
Susceptible pregnant female
(non-PI) infected with BVDV at
about 1½ - 4 months of gestation.
BVDV persistently infected (PI)
female becomes pregnant.
BVD Virus
BVD virus from
any source
Most common route
(Over 90%)
BVD Virus
Less common route
(Less than 10%)
BVDV persistently infected (PI)
calf is produced.
Most Common Way of Transmission
 Direct contact with PI cattle!
Diagnosis
 Skin biopsy

Formalin fixation

Immuno-histo-chemistry

No interference from maternal antibody

Only test animal once
 Viral isolation from serum
Maternal antibody can interfere
 Must repeat positives in 3 weeks

 Serology

Limited use
Prevention
 Biosecurity

Pre-entry test: skin biopsy


Replacement heifers and bulls
Stocker and feeder cattle
 Proper nutrition
 Vaccination