scholarly journals Experimental Infection of Laying Hens with Salmonella enteritidis Strains that Express Different Types of Fimbriae

1996 ◽  
Vol 75 (11) ◽  
pp. 1365-1372 ◽  
Author(s):  
D. THIAGARAJAN ◽  
H.L. THACKER ◽  
A.M. SAEED
Keyword(s):  
Experimental Infection ◽  
Salmonella Enteritidis ◽  
Laying Hens ◽  
Different Types

scholarly journals Effects of Essential Oils-Based Supplement and Salmonella Infection on Gene Expression, Blood Parameters, Cecal Microbiome, and Egg Production in Laying Hens

Animals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 360
Author(s):  
Georgi Yu. Laptev ◽  
Elena A. Yildirim ◽  
Larisa A. Ilina ◽  
Valentina A. Filippova ◽  
Ivan I. Kochish ◽  
...  
Keyword(s):  
Egg Production ◽  
Salmonella Enteritidis ◽  
Laying Hens ◽  
Expression Profiles ◽  
Blood Parameters ◽  
Post Inoculation ◽  
Production Traits ◽  
Immunological Parameters ◽  
Specific Expression ◽  
Blood Biochemical

One of the main roles in poultry resistance to infections caused by Salmonella is attributed to host immunity and intestinal microbiota. We conducted an experiment that involved challenging Lohmann White laying hens with Salmonella Enteritidis (SE), feeding them a diet supplemented with an EOs-based phytobiotic Intebio®. At 1 and 7 days post-inoculation, the expression profiles of eight genes related to immunity, transport of nutrients in the intestine, and metabolism were examined. Cecal microbiome composition and blood biochemical/immunological indices were also explored and egg production traits recorded. As a result, the SE challenge of laying hens and Intebio® administration had either a suppressive or activating effect on the expression level of the studied genes (e.g., IL6 and BPIFB3), the latter echoing mammalian/human tissue-specific expression. There were also effects of the pathogen challenge and phytobiotic intake on the cecal microbiome profiles and blood biochemical/immunological parameters, including those reflecting the activity of the birds’ immune systems (e.g., serum bactericidal activity, β-lysine content, and immunoglobulin levels). Significant differences between control and experimental subgroups in egg performance traits (i.e., egg weight/number/mass) were also found. The phytobiotic administration suggested a positive effect on the welfare and productivity of poultry.

Horizontal Transmission of Salmonella enteritidis and Effect of Stress on Shedding in Laying Hens

1994 ◽  
Vol 38 (2) ◽  
pp. 282 ◽  
Author(s):  
Masayuki Nakamura ◽  
Noriyuki Nagamine ◽  
Toshio Takahashi ◽  
Shoko Suzuki ◽  
Mayumi Kijima ◽  
...  
Keyword(s):  
Salmonella Enteritidis ◽  
Laying Hens ◽  
Horizontal Transmission

scholarly journals Colonization of mature laying hens with Salmonella Enteritidis by oral or intracloacal inoculation

2017 ◽  
Vol 26 (2) ◽  
pp. 286-294
Author(s):  
P. Adhikari ◽  
D.E. Cosby ◽  
N.A. Cox ◽  
W.K. Kim
Keyword(s):  
Salmonella Enteritidis ◽  
Laying Hens

Detection and Enumeration of Salmonella enteritidis in Fresh and Stored Eggs Laid by Experimentally Infected Hens

1992 ◽  
Vol 55 (3) ◽  
pp. 152-156 ◽  
Author(s):  
RICHARD K. GAST ◽  
C. W. BEARD
Keyword(s):  
Salmonella Enteritidis ◽  
Room Temperature ◽  
Laying Hens ◽  
Phage Type ◽  
The Other ◽  
Refrigerator Temperature

Laying hens were orally inoculated with a phage type 13a strain of Salmonella enteritidis (SE). Eggs laid by the infected hens were collected daily between the 4th and 14th d postinoculation and randomly allocated into three groups. One group of eggs was sampled on the day of collection, one group was held for 7 d at 7.2°C before sampling, and one group was held for 7 d at 25°C before sampling. The frequency and level of detectable contamination of egg contents by SE were determined for each group. Only 3% of the freshly laid eggs and 4% of the eggs held for 7 d at refrigerator temperature were identified as having SE-contaminated contents, whereas SE was isolated from the contents of 16% of eggs held for 7 d at room temperature. Enumeration of SE in contaminated eggs indicated greater numbers of SE in eggs held for 7 d at 25°C than in eggs from the other two groups, although most contaminated eggs in all three groups contained relatively small numbers of SE (generally less than 10/ml and rarely exceeding 100/ml).

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