Comparison and assessment of necropsy lesions in end-of-lay laying hens from different housing systems in Denmark
| Autor: | Anders Miki Bojesen, Ida Thøfner, Chong Wang, Jens Peter Christensen, Susanne Elisabeth Pors |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Denmark
Physiology Peritonitis Skin infection 03 medical and health sciences Oophoritis Prevalence Medicine Animals reproductive tract Animal Husbandry Anatis Poultry Diseases 030304 developmental biology Subclinical infection lcsh:SF1-1100 subclinical infections 0303 health sciences biology business.industry laying hens 0402 animal and dairy science Salpingitis 04 agricultural and veterinary sciences General Medicine Bacterial Infections Immunology Health and Disease medicine.disease biology.organism_classification 040201 dairy & animal science Housing Animal Etiology Animal Science and Zoology Female pathology Flock Autopsy lcsh:Animal culture business bacteriology Chickens |
| Zdroj: | Poultry Science, Vol 99, Iss 1, Pp 119-128 (2020) Poultry Science Wang, C, Pors, S E, Christensen, J P, Bojesen, A M & Thøfner, I 2020, ' Comparison and assessment of necropsy lesions in end-of-lay laying hens from different housing systems in Denmark ', Poultry Science, vol. 99, no. 1, pp. 119-128 . https://doi.org/10.3382/ps/pez569 |
| ISSN: | 0032-5791 |
| Popis: | Apperantly healthy laying hens at the end of production (60 to 91 wk) were investigated for the occurrence of pathology and bacterial infections. In total, 7,477 hens from 15 flocks representing the following production systems: Enriched cages, barn housed layers, and organic/free range layers were necropsied. Indications of bacterial infection were investigated by bacteriological cultivation. The overall prevalence of lesions was 16.60%, including lesions of both infectious and non-infectious origin. The most prevalent lesions were bursitis presternalis (6.65%), reproductive tract lesions (e.g., salpingitis and/or peritonitis and/or oophoritis) (3.50%), serosal scarification (e.g., fibrotic adhesive peritonitis) 1.55%, and neoplasm 1.73%. Significant differences were observed between different production systems and/or flocks in the prevalence of reproductive tract lesions, bursitis presternalis, serosal scarification, skin infections, juvenile hens, and traumas/fractures. No significant difference was observed between different production systems in the prevalence of neoplasia, infection of septicemic etiology, and pododermatitis. In total, 3.4% of the hens were out of lay, with significantly higher rate in organic flocks. Infections of the reproductive tract were the most prevalent lesions with bacterial etiology in all productions systems. In total, 40% of the hens with lesions associated to the oviduct were out of lay and significant difference between production systems were observed. Escherichia coli was the most commonly isolated bacteria and in 90% of the cases they were isolated from the reproductive tract lesions. The second most prevalent bacteria was Gallibacteruim anatis. Significant difference in the prevalence of E. coli positive hens was observed between production systems (P < 0.05). In conclusion, the prevalence of reproductive tract lesions in apparently healthy end-of-lay laying was higher than indicated in previous reports. These findings support the previous suggestions that E. coli and G. anatis are the major pathogens causing reproductive tract lesions. |
| Databáze: | OpenAIRE |
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