Adaptability is a broad term to measure the capacity/potential of an animal to survive and thrive in particular environments and stressors. It is often expressed in terms of physiological or genetic adaptation. Physiological adaptability depends upon a norm of reaction yielding a certain adaptedness in the environments which individuals or populations meet. Genetic adaptability occurs by changing the norm of reaction to produce an improved adaptedness in some or all, old or new environments. The latter may refer to heritable alterations to animal characteristics that favour survival of a population in a particular environment. This may involve evolutionary changes over many generations (seleceted by nature) or acquiring specific genetic properties (selection by man) (Hafez, 1968; Rieger et al., 1976).
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