Date post: | 20-Dec-2015 |
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Reproductive Diseases of Cattle
Floron C. Faries, Jr., DVM, MSProfessor and Extension Program Leader for Veterinary
MedicineTexas 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)
persistent infection
abortion, stillbirth
infertility congenital defectsrepeat breeding
immune responsed 0 d 283d 125 d 150d 58 d 90
BVD Infection during Pregnancy
Susceptible pregnant female (non-PI) infected with BVDV at
about 1½ - 4 months of gestation.
BVDV persistently infected (PI)female becomes pregnant.
BVDV persistently infected (PI)calf is produced.
Most common route (Over 90%)
Less common route (Less than 10%)
HOW TO MAKE A PI
BVD VirusBVD virus from any source
BVD Virus
Most Common Way of Transmission
Direct contact with PI cattle!
Skin biopsy
Formalin fixation
Immuno-histo-chemistry
No interference from maternal antibody
Only test animal once
Diagnosis
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 nutritionVaccination