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Stress & Welfare
Transcript of Stress & Welfare
load placed on a system
What is Stress?
Negative Consequences of Stress
All living systems require a
certain amount of stress
to function normally
Stress & Welfare
, measured as the
deformation of the system.
In biology, stress is the
intensity & duration
of a challenge
faced by an organism.
Strain refers to the
alteration in the organism's
Living organisms have
to minimise these deviations...
When this balance is maintained within acceptable limits, the animal is
Animals have a physical and mental
they must maintain.
Stress is a biological response elicited when an individual perceives a
threat to it's homeostasis.
If the challenge
exceeds the animal's ability
to maintain homeostasis, they are no longer coping successfully, known as
Tomorrow We Will be...
"Animal Welfare" (Appleby et al., 2011)
Looking at how we
physiological and behavioural stress responses
So you need to read:
Make sure that you
these changes and what triggers them
Learning Outcomes for today
An event or experience that
(Collins English Dictionary, 2009)
It causes a
threat to homeostasis
, either by challenging physical or psychological systems
This causes a
in an attempt to
maintain homeostasis and protect the animal
Overcrowding, bullying, aggression,
competition over resources
Restricted movement, barren environment, isolation
Fear can be caused by bad handling/training, inappropriate predator presence, chaotic environment
Injury or Pain
Short, brief and intense
exposure, typically to a single stressor
Acute stress is a
normal aspect of life
which may reflect actual, potential or imagined threat
to one stressor or a number of acute stressors accumlating, either of which can lead to
A stressor is present in the environment but
not placing strain
on the animal yet
This means that it
doesn't shift resources
away from normal function and so
hasn't challenged homeostasis
However, it consumes some level of resources, leaving the animal
- "the straw that breaks the camel's back"
Clear signs & symptoms
behavioural and physiological
- try to remove the stressor
- remove yourself from the stressor
- hope to remain undetected
These biological responses successfully prepare crucial
Stressors are conditions or events which
Stress can be
To cope with stress, living systems may
divert energy from other crucial functions
, which can have profound effects
Stress is indicated by changes in
behaviour, health and physiology
It is only when stress
exceeds an animal's ability to cope
that it is harmful
Although these diagrams represent humans,
these principles are fundamentally the same in animals
and watch the stress response video again
Explain the impact that stress, and the animal's response to stress, have on animal welfare
Aims for today
Understand what stress is,
what triggers it,
the bodies response to it
and the consequences of stress