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Heat Stress and Stroke - Coggle Diagram
Heat Stress and Stroke
risk factors
environment
high ambient temperature (>78f)
high humidity
temp humidity index >72F
management
heavy fleece
excessive forced pysical activity
lackof access to shade or adequate water
changes
physiological
Increased resp rate (>80 bpm)
drooling
panting
increased blood flow to skin
increased sweating
decreased blood flow to internal organs
altered rumen fermentation
rectal temp exceeds >102.5
as body temperature exceeds 107F
preipheral vasoconstriction
decreased blood pressure
decreased cardiac output
DIC
liver damage
renal failure
myocardial necrosis
behavior
increased water intake
seek shade or wind
stand more vs laying down
decreased dry matter intake by >10%
results
decreased milk production
increased risk of metabolic disease
increase suceptibility to infectious disease
increased cortisol
impaired repro performance
decreased conception rate
increased early embryonic death
temperature directly affected ovum, sperm, embryos
hormonal effects
increased culling and death
increased laminitis-assocaited lesions 6-8w
heat load increasing faster than heat can be dissapated
CS
rectal temp 106-108
lethargic
weak, flaccid mm
prostration
shock
sudden death/found dead
prevention
confinement housing
adequate air movement
natural ventilation
do't put facility by a hill or other windd-blocking lanscapes
high sidewealls
remove obstructions to air flow
adjustable curtains
open ridge on barn
mechanical ventilation
positive or negative pressure
cross-vent/tunnel-vent
adequate, clean water in multiple locations
sun shades in feedlot/pastures
facilitate cooling by convection or evaporation
facilitate cooling
fans
sprinkler systems
misters
mechanisms of decreasing body temp
increase heat loss
vasodilation
sweating
increase rep rate
panting
behavioral
seek shade
seek wind
find water
stand up
decrease heat production
reduce feed intake