calf mortality in cow herds floron c. faries, jr., dvm, ms professor and extension program leader...
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Calf Mortality in Cow Herds
Floron C. Faries, Jr., DVM, MSProfessor and Extension Program Leader
Texas AgriLife Extension ServiceTexas A&M System
College Station, TX 77843http://extensionvetmed.tamu.edu
Calf Scours
Causative Disease Agents Calf AgesBacteria
E. coli <5 daC. perfringens B, C 5-30 daC. perfringens D >30 daSalmonella >15 da
VirusesRotavirus 5-15 daCoronavirus 5-15 daBVD >30 da
Protozoa
Cryptosporidia 5-30 da
Coccidia >15 da
Calf Ages Disease Agents
<5 da E. coli
5-15 da RotavirusCoronavirusC. perfringens B, CCryptosporidia
15-30 da C. perfringens B, CCryptosporidiaCoccidiaSalmonella
>30 da CoccidiaSalmonellaC. perfringens DBVD
Disease Agent Sources
Carrier Cows, Heifers Manure – Vulva, ground (teats, haircoat,
grass, hay)
Diseased Calves Scours – Ground (haircoat, grass, hay)
Calf Pathology/Signs
Intestinal Mucosa Damage Irritation, necrosis, toxins
Diarrhea, Dehydration Malabsorption Hypersecretion Colon fermentation, fluid retention
Electrolyte Imbalance Acidosis – bicarbonate loss
Body Weakness
Reduced Nursing
Possible Septicemia
Calf Septicemia
Causative Disease Agents
E. coli
Lepto
Calf Pneumonia
Causative Disease Agents
BacteriaPasteurellaH. somnus
VirusesIBR
PI3
BRSVBVD
Stress
Weather
Weaning
Disease Incidence Factors
Carrier Cows, Heifers, Calves - Disease agents
Contaminated Environment - Disease agents
Stressed Cows, Heifers - Suppressed immunity Disease agent shedding Reduced colostrum quantity Reduced colostrum globulins (quality)
Thin Cows, Heifers – Low Energy Diet Reduced colostrum quantity Reduced colostrum globulins (quality)
Heifers Colostrum – Lower quantity, quality
Calves Late Colostrum Intake No local, systemic immunity
>6 hrs, >24 hrs after birth
Calves, Low Colostrum Intake Weak local, systemic immunity
< 10% body weight – First 24 hrs Weak local immunity
<10% body weight – Second day <10% body weight – Third day
Stressed Calves Dystocia, cold stress
Colostrum intake – Low, late Heat stress
Globulin absorption - Reduced
Disease Management Practices
Sanitary Measures Maternity pasture
7 da pre-calving to 1 da post-calving 15 acres per 75 females Rotate pastures anually
Nursery pasture 3 wks 20 acres per 75 pairs Rotate pastures annually
Nursing pasture 3 wks post-calving to weaning Prevent overcrowdedness
Treatment pasture/pen Isolate diseased calves 1 wk minimum
Haying, Supplement Feeding Facilities Rotate locations Manure removal
Shelter Facilities Manure removal
Prevent Stress in Pregnant Cows, Heifers Provide shelter, wind breaks Energy diet (grain) – last trimester
Assure calf nursing Within 6 hours of birth
Identify Reasons for Late/Low Colostrum Intake/Absorption Abandoned calf Calf can’t find teat Big teats Weak calf Calf kicked off Calf not mothered Udder not distended Caesarean cow/heifer
Bottle Feed Non-nursing Calf Within 6 hrs of Birth
Colostrum quantity – 5% body weight
Next 18 – 24 hrs Colostrum quantity – 5% body weight
Days 2 and 3 Colostrum quantity – 10% body weight
Disease Diagnostic Procedures
Laboratory Tests of Fresh Scour Specimen Bacteria culture/antibiotic sensitivity Virus isolation Protozoa demonstration
Disease Vaccination Practices
Pre-calving Vaccination of Pregnant Cows, Heifers Procedures
Intramuscularly, subcutaneously 2 doses, 2-3 and 6-8 wks before calving 1 dose annually
Products E. coli K-99 Bacterin Rotavirus/Coronavirus Vaccine (Killed, Modified
live) C. perfringens C,D (B) Bacterin (7-way Blackleg) Lepto (5–way) IBR/PI3/BRSV/BVD Pasteurella H. somnus
Vaccination of Calves at Calving Procedures
Orally 1 dose at birth
Products E. coli K-99 Monoclonal Antibody Rotavirus/Coronavirus Vaccine (Modified live)
Disease Treatment Practices
Dehydrated Calves Procedures
Orally, intravenously, intramuscularly
Products Oral electrolytes – 1 to 2 qts. Every 6 to 8 hrs. Intravenous electrolytes Antibiotics – E. coli septicemia
Genetic Defects
Homozygous Recessive Genes
Double Recessive Genes
Passed by both Parents
Anal Atresia Scrotal Hernia Cryptorchidism Cleft Palate Over-shot Jaw Mulefoot Dwarfism Five-legged Supernumerary Teats No Teats No Tail
Twinning
Genetic Inheritable (1% Rate) Free Martins Lighter Birth Weights Heavier Dual Weaning Weights Retained Placentas Dystocias Perinatal Calf Mortality Reduced Fertility Increased Nutritional Requirements