Abstract

One hundred-and-one hybrids of the Canadian Landrace, Large White, Belgian Landrace and Duroc breeds were repeatedly tested for sensitivity to halothane at the age of 8–15 weeks. Changes in the number of reactors were recorded in the experiment. The number of reactors was 40 in the first test, 33 in the second and 30 in the third. Two individuals changed from non-reactors to reactors; 12 reactors assessed by the standard halothane test ceased to differ during repeated tests from non-reactors. However, these individuals with secondary non-reactivity transmitted halothane-sensitivity to the progeny.

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