[Relationship between the genetic polymorphism of alkaline phosphatase and the resistance of broiler poultry to Marek's disease virus].

Studied was the polymorphism of alkaline phosphatase in blood plasma samples taken from 507 poulets and cocks of lines 66 and 77 of the Cornish breed, and lines 88 and 99 of the White Plymouth Rock breed. The birds were divided into three groups to test their resistance to Marek's disease: (1) controls, (2) infected with the virus of Marek's disease with 3 subgroups--resistant birds, slightly susceptible ones, and strongly susceptible ones, and (3) contacts, with two subgroups--survivals and birds that died. The blood plasma alkaline phosphatase was determined through horizontal electrophoresis on a starch gel, employing the method of Gahne.

[Resistance of broilers to Marek's disease virus].

Studied was the resistance, resp., susceptibility of the initial broiler lines - 66 and 77 of the Cornish breed, and 88 and 99 of the Plymouth Rhock breed, which are used in this country for the production of the four-line hybrid, - to the virus of the Marek's disease, isolate CT-1. A biologic assay was carried out with a total of 2080 young birds divided into three groups; I groups - infected abdominally; II group - contacts; and III group - controls.