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OJVRTM
Online Journal of
Veterinary Research©
(Including Medical and Laboratory Research)
Established 1994
ISSN 1328-925X
Volume 28(4): 216-225, 2024.
Urolithiasis
in commercial layers given infectious bronchitis vaccines or high calcium
diets.
M Shakeel
Ahmed, Y Anjaneyulu, SV 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 layers given infectious bronchitis vaccines or high calcium
diets, Onl J Vet Res., 28(4): 216-225, 2024. Urolithiasis is an obstructive renal disorder causing sporadic or high
mortality in birds. In two farms mortality started at 11-12 weeks 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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