Salmonella enterica serovar Enteritidis is the predominant serovar associated with salmonellosis worldwide, which is in part due to its ability to contaminate the internal contents of the hen's egg. It has been shown that S. enterica serovar Enteritidis has an unusual tropism for the avian reproductive tract and an ability to persist in the oviduct and ovary. Factors allowing S. enterica serovar Enteritidis strains to contaminate eggs could be a specific interaction with the oviduct tissue, leading to persisting oviduct colonization. In vivo expression technology, a promoter-trap strategy, was used to identify genes expressed during oviduct colonization and egg contamination with S. enterica serovar Enteritidis. A total of 25 clones with in vivo-induced promoters were isolated from the oviduct tissue and from laid eggs. Among the 25 clones, 7 were isolated from both the oviducts and the eggs. DNA sequencing of the cloned promoters revealed that genes involved in amino acid and nucleic acid metabolism, motility, cell wall integrity, and stress responses were highly expressed in the reproductive tract tissues of laying hens.
- American Society for Microbiology
- Salmonella enterica serovar enteritidis genes induced during ...
Composting Livestock Mortalities
Performance, composting methods, environmental impacts and biosecurity of the process are evaluated for emergency disposal of cattle by research team at Iowa State University. A THREE-YEAR study was commissioned by the Iowa Department of Natural Resources to evaluate the practical feasibility, performance, environmental impacts and biosecurity of using composting for emergency disposal - should a livestock or poultry disease outbreak (or agro-terrorism) occur in Iowa. During that time, approximately 54 tons of...
Modeling the PCB transfer into hen eggs: Influence of physiological characteristics of the animal
Laying hens are likely to be exposed to a wide range of persistent organic pollutants (POPs), including polychlorobiphenyls (PCBs). In order to improve the safety of poultry farming systems regarding POPs, our research has focused on assessing the impact of physiological characteristics of the hen on the transfer of ingested PCBs to eggs. Modeling was used as a research tool to explore the impact of some physiological characteristics on the transfer of PCBs in the laying hen. The mathematical model simulates the...
A small plant with great success - case study
The farm-based biogas plant operated by the Wienken family in Augustenfeld (near Löningen) is the first plant of its size built by bwe. Originally, the farm`s operator had planned to install a straw heating element. However, since the input materials are available on the farm itself in their entirety, the decision to implement a biogas plant designed by bwe was obvious. One decisive aspect of this decision was (among others) the state aid provided to small-scale plants. In the past several years, these have...
Manure Compost A New Cash Crop
A growing number of livestock producers are discovering manure compost as a new cash crop. When Mark Meyer refers to the “magic” at New Day Farms, he isn’t referring to the liquid egg products generated by more than 2.5 million laying hens. Rather, Meyer, the environmental manager at the Ohio facility, is talking about the nearly 38,000 tons of compost produced annually from poultry manure, which is then sold throughout North America, some of which he says has even landed on the lawn of the...