Behavioral indicators of infectious disease. (6)
- Increased: lethargy/ sleepiness, pain sensitivity (hyperalgesia)
- Decreased: appetite, locomotor activity, grooming, exploration/ social/ sexual behavior
What is the physiologic reason for anorexia, lethargy, and decreased exploratory/ social/ sexual behavior in a cow with an infectious disease?
inflammatory cytokines from macrophages: IL-1β, IL-6, TNFα
What technologies are used to study behavior in dairy cows? (4)
electronic feedbins, accelerometers and rumination collars, video cameras
In the first 48 hrs after onset of mastitis infection, what behavioral indicators change? (2)
lower feed intake, lower rumination
How does mastitis affect lying time?
- decreased lying on the side with the infected quarter
- increased "idle" standing time (reduced activity)
Cows with metritis are _________ likely to get a DA.
Cows with subclinical ketosis after calving...
eat less beginning 1 week before calving.
Cows with clinical ketosis after calving...
spend less time lying beginning 1 week before calving.
Lameness leads to... (4)
- less time spent feeding
- lower ruminations
- more time lying (depending on stall surface- no difference with mattresses b/c they're just as uncomfortable as standing)
- more time perching during transition period
What is our use for behavioral indicators of disease? (4)
- use behavioral changes to diagnose disease
- use behavioral changes to help develop suitable hospital pens
- identify management practices that might cause certain behaviors
- monitor behavior to detect the "at-risk" individuals