Pathomorphologial investigation of spondylolisthesis leaded to spondylosis in commercial broiler chicken with posterior paralysis: A case study

Document Type : Clinical Report

Authors

1 Department of Basic Sciences, Faculty of Veterinary Medicine, Amol University of Special Modern Technologies, Amol, Iran

2 Nanobiotechnology Research Center, Avicenna Research Institute, Academic Center for Education, Culture, and Research (ACECR), Tehran, Iran

3 Department of Clinical Sciences, Faculty of Veterinary Medicine, Amol University of Special Modern Technologies, Amol, Iran

Abstract

Spondylolisthesis known as kinky back syndrome is a deformity of the free sixth thoracic vertebra including enlargement and rotation resulting in posterior paralysis in broiler chicken. Genotype, feeding regimes and environment are involved in occurrence of this congenital anomaly. Spondylolisthesis may result in or happen simultaneously with two other major axial skeleton pathologies including spondylosis and spondylitis as a result of occurrence of degenerative necrobiotic lesions and inflammation of the vertebrae, respectively. This report deals with a male broiler chicken with posterior paralysis in the second week of rearing. After euthanasia, the specimen was evaluated at macroscopic and microscopic levels. Macroscopic findings showed the unilateral enlargement of body and transverse process of sixth thoracic vertebra and downward rotation of the body. The histopathological studies revealed the focal chondronecrosis and degenerative changes in articular facets and cranial process of the vertebra. In conclusion, a diagnosis of spondylolisthesis followed by spondylosis was made based on macroscopic and histopathological findings that to the authors’ best knowledge, is the first report in a broiler farm in Iran.

Keywords


  1. Dinev I. Pathomorphological investigations on the incidence of axial skeleton pathology associated with posterior paralysis in commercial broiler chickens. J Poult Sci 2013; 50(4): 283-289.
  2. Dinev I. Axial skeleton pathology in broiler chickens. Worlds Poultry Sci J 2014; 70(02): 303-308.
  3. Makrai L, Nemes C, Simon A, et al. Association of enterococcus cecorum with vertebral osteomyelitis and spondylolisthesis in broiler parent chicks. Acta Vet Hung 2011; 59(1): 11-21.
  4. Khan MA, Olson NO, Weiss R. Spondylopathy in broilers. Case reports. Poult Sci 1973; 52(5): 1847-1852.
  5. Dinev I. Pathomorphological investigations on the incidence of clinical spondylolisthesis (kinky back) in different commercial broiler strains. Revue Méd Vét 2012; 163(11): 511-515.
  6. Pompeu MA, Barbosa VM, Martins NRS, et al. Nutritional aspects related to non-infectious diseases in locomotor system of broilers. Worlds Poultry Sci J 2012; 68(04): 669-678.
  7. Ross 308 Broiler – Performance objectives. Available at: https://www.winmixsoft.com/files/info/Ross-308-Broiler-PO-2014-EN.pdf. Accessed 30 March, 2021.
  8. Borst LB, Suyemoto MM, Sarsour AH, et al. Patho-genesis of enterococcal spondylitis caused by Enterococcus cecorum in broiler chickens. Vet Pathol 2017; 54(1): 61-73.
  9. Duff SRI. Do different forms of spondylolisthesis occur in broiler fowls? Avian Pathol 1990; 19(2): 279-294.
  10. Talebi A, Taifebagherlu J, Sharifi A, et al. Spondylitis in broiler breeder farms in West-Azerbaijan province, Iran: Clinical Report. Vet Res Forum 2016; 7(4): 353-355.
  11. Riddell C, Topp R. Mycotic spondylitis involving the first thoracic vertebra in chickens. Avian Dis 1972; 16(5): 1118-1122.