This appears to be a variant or misspelling of 'crossbred,' referring to an animal produced by breeding two different breeds or species.
Likely a double-b variant or transcription error of 'crossbred,' from 'cross' + 'bred.' Standard form is 'crossbred' with single 'b'.
Crossbred animals often show 'hybrid vigor'—they're actually healthier and stronger than purebreds because genetic diversity gives them better immunity to disease!
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