When resistance to Salmonella enteritidis (SE) was assessed through survival of day-old chicks intra-muscularly inoculated with the lethal dose 50 %, h2 was at 0.34 ±0.13. When 13-week-old chicks were intravenously inoculated with 106 SE, estimated heritabilities of SE levels in spleen, liver and genital organ three days after inoculation ranged from 0.06 ±0.04 to 0.13 ± 0.07. Heritabilities of resistance to SE contamination of spleens and caeca four weeks after oral contamination of laying hens with 109 SE were at 0.32 ± 0.23 and 0.38 ± 0.25 respectively. Selection for reduced contamination should be feasible but further investigations are needed to estimate the genetic correlations between these four measures as well as with laying intensity.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 24: Sheep and goats (fibre); sheep and goats (meat and milk); poultry; horses; buffaloes., , 263–266, 1998
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