Resistance Against Salmonella Enteritidis Natural Infection and Production Aspect on Kampung Chicken and Commercial Laying Hen
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The aim of this research was to study the resistance against S. enteritidis natural infection and its production aspect on kampung chicken and commercial laying hen. Kampung chicken and commercial laying hen (8 month aged), each of it were 20 chickens placed in cages on open housed system. Rearing was carried out for 4 weeks. Biological assays of resistance indicator were measured, including leucocytes concentration and their differentiation, concentration of S. enteritidis, and specific IgY of S. enteritidis. Observations on production aspect and income over feed cost analysis were done. Experiment was designed using a completely randomized design. Data from laboratory assays were statistically analyzed. Data from observations on production aspect were descriptively analyzed. Leucocytes concentration of kampung chicken and commercial laying hen were 20.23 x 103 and 29.36 x 103 cell/mm3. Percentage of monocytes was not different. Percentage of heterophiles on kampung chicken was lower significant, but percentage of lymphocytes was higher significant than commercial laying hen. H/L of kampung chicken and commercial laying hen were 0.88 and 3.57. There was no S. enteritidis finding in blood and eggs produced by the two types of chicken. Specific IgY of S. enteritidis was found on all types of chicken. Concentration of it in eggs yolk of kampung chicken and commercial laying hen were 3.19 and 1.08 mg/ml. The average of feed consumption, hen day production, and egg weight on kampung chicken were lower than commercial laying hen. Income over feed cost (20 chickens, during 28 days reared) from kampung chicken and cmmercial laying hen were Rp 288000 and Rp 90000. It can be concluded that kampung chicken was more resistant against S. enteritidis natural infection. Performance of production on kampung chicken was lower, but their income over feed cost was higher than commercial laying hen.
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