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OJVRTM
Online Journal of
Veterinary Research©
(Including Medical and Laboratory Research)
Established 1994
ISSN 1328-925X
Volume 28(4): 229-236,
2024.
Urolithiasis in commercial layers.
M. Shakeel Ahmed, Y. Anjaneyulu, S. V. Rama Rao#, M. Lakhsman.
Department of
Pathology, College of Veterinary Science, Rajendranagar
and Project Directorate on Poultry, Rajendranagar,
Hyderabad.
ABSTRACT
Ahmed MS, Anjaneyulu Y, Rama
Rao SV, Lakhsman M., Urolithiasis in commercial layers, Onl J
Vet Res., 28(4): 229-236, 2024. Urolithiasis is an obstructive renal disorder causing sporadic or high
mortality in birds. In two farms mortality started at 11- 12 weeks of age and
peaked by egg laying at 17- 18 weeks. In one farm we found 234 cases of
urolithiasis in 4000 birds (5.85%) and in other, 209 cases in 11500 (1.8%).
From these we report clinical signs, hematology,
serum biochemistry, gross and microscopical
changes in groups of 10 layer birds with urolithiasis compared with 10 normal
controls. Clinically, affected birds appeared
dehydrated. Compared with controls, in birds with urolithiasis, packed cell
volume increased (P > 0.05-0.001) 13-22%, hemoglobin 13-20%, red blood cells
7-10%, uric acid 69-83%, creatinine 70-77%, calcium 9-24% and phosphorus 23-40%.
Gross lesions showed distended ureters with concretions, atrophy of lobes
drained by obstructed ureters and hypertrophy lobes causing asymmetric kidneys
and urate deposits on visceral organs. Microscopy
revealed degeneration, sloughing of tubular epithelium, interstitial
nephritis, urate crystals in parenchyma, fibrosis and plasma cells with PAS
positive cytoplasm. We attribute urolithiasis in farm with 4000 to infectious
bronchitis and in farm of 11500 birds to high calcium diets.
Key Words: Urolithiasis, commercial layers, hematology, biochemistry,
gross lesions, microscopy.
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