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