reproductive diseases of cattle floron c. faries, jr., dvm, ms professor and extension program...
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![Page 1: Reproductive Diseases of Cattle Floron C. Faries, Jr., DVM, MS Professor and Extension Program Leader for Veterinary Medicine Texas AgriLife Extension](https://reader035.vdocuments.net/reader035/viewer/2022062714/56649d445503460f94a2199d/html5/thumbnails/1.jpg)
Reproductive Diseases of Cattle
Floron C. Faries, Jr., DVM, MSProfessor and Extension Program Leader for Veterinary
MedicineTexas AgriLife Extension Service
Texas A&M System
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Reproductive Diseases
Bacterial Brucellosis (Bang’s) Leptospirosis (Lepto) Vibriosis (Vibrio)
Viral Infectious Bovine Rhinotracheitis (IBR) Bovine Viral Diarrhea (BVD)
Protozoal Trichomoniasis (Trich) Neosporosis (Neospora)
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Bovine Viral Diarrhea
(BVD)
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persistent infection
abortion, stillbirth
infertility congenital defectsrepeat breeding
immune responsed 0 d 283d 125 d 150d 58 d 90
BVD Infection during Pregnancy
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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
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Most Common Way of Transmission
Direct contact with PI cattle!
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Skin biopsy
Formalin fixation
Immuno-histo-chemistry
No interference from maternal antibody
Only test animal once
Diagnosis
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Viral isolation from serum Maternal antibody can interfere Must repeat positives in 3 weeks
Serology Limited use
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Prevention
Biosecurity Pre-entry test: skin biopsy
Replacement heifers and bulls Stocker and feeder cattle
Proper nutritionVaccination