Hybrid vigor: Increased vitality resulting from breeding cats of two different breeds together.
Hyperthermia: Increased body temperature that can result from heat stroke.
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In fact hybrid vigor serves to improve health. The scientific term is heterosis. It is also known as outbreeding enhancement and is the opposite to inbreeding depression (ill health or a propensity to ill health caused by inbreeding).
Other comparative selective breedings were done to create a genetically sound cat with a large gene pool and hybrid vigor. All of these were increased by out crossing to other breeds as well.
breed books may produce smaller litters of three or four kittens on average as a result of increasing inbreeding, but those registered where new blood can still be added to the breed tend to the traditional larger litters that come with hybrid vigor, ...
The broad gene pool of the breed gives it a great deal of what is called 'hybrid vigor.
The principle of hybrid vigor dictates that hybrid cats are often healthier and larger than either parent. The first three generation males are almost always infertile, though there have been the occasional, but rare F3 studs capable of reproduction.
in Europe and North America have bred the Sphynx to normal coated cats and then back to hairless for more than thirty years. The purpose of these selective breedings was to create a genetically sound cat with a large gene pool and hybrid vigor.
 See also: Hybrid, CFA, Gene pool, Conformation, Selective breeding
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