Comparison of diseases resistance between white and brown layer lines to experimental infection of Salmonella gallinarum

Woo, Yong-ku; Kim, Bong-hwan

Korean Journal of Veterinary Research 1998;38(4):784-792.

Yong-ku Woo¹, Bong-hwan Kim²

¹National Veterinary Research and Quarantine Services
²College of Veterinary Medicine, Kyungpook National University

가금티푸스군의 인공감염에 대한 백색 및 갈색 산란계 계통간의 내병성 비교

우용구¹, 김봉환²

¹농림부 수의과학검역원
²경북대학교 수의과대학

Abstract

This study was conducted to select resistant chicken-line between Brown and White layer lines against Salmonella gallinarum infection. The Brown and White layer chickens allocated into different age groups were inoculated with S gallinarum (WJO-126) either orally($1{ imes}10^7cfu$) or intramusculaly($5{ imes}10^6cfu$) and clinical observations were made for 2 weeks. All dead birds were necropsied and culture was made to recover the inoculated organinsm from liver, spleen, brain, bone marrow and cecal contents. Serum was isolated from all live birds after 2 weeks experiment and these birds were also necropsied and cultured to reisolate S gallinarum. The brown layers showed very high mortality to S gallinarum infection regardless of their ages and routes of inoculation, while white layers did not shown any mortality by the direct effects of S gallinarum. The mortality rate of 2 week old brown layers, in particular, were 82.6% (19/23) in peroral group and 86.9% in intramuscularly inoculated group, while those of white layer groups were only 0.0% in both groups. S gallinarum could be reisolated from all dead birds, especially, from liver and spleen. This result was inferred that the organism is highly invasive on the chicken. The intramuscularly challenged birds showed more seropositive-reactors(86.9%) than orally inoculated groups(61.9%). The overall results of present study suggested that white layers are much more resistant than brown layers against the experimental infection of S gallinarum and shown experimentally that resistance to S gallinarum is a characteristic of the White-line layers.

Key Words: S gallinarum, disease resistance, brown line, white line