EFFECTS OF HIGH
DIETARY CALCIUM AND LOW PHOSPHORUS
ON URINARY SYSTEM OF BROILER CHICKS
M. Ansar, S.
A. Khan, Z. I. Chaudhary, N. A. Mian1, M. Y. Tipu and M. F. Rai
Department of Pathology, 1 Department of
Animal Nutrition,
University of Veterinary and Animal Sciences, Lahore 54000-Pakistan
Abstract
The present
study was carried out to investigate the effects of high dietary calcium and low
phosphorus on urinary system of broiler chicks. A total of 90 (day-old) broiler
chicks were divided into three equal groups A, B and C. The chicks were reared
for 42 days on three experimental rations. Calcium:phosphorus ratio in the feed
for groups A, B and C was maintained as 1:0.5(control), 2:0.5 and 3:0.5, respectively. Various parameters studied
included serum calcium and phosphorus concentrations, FCR, kidney:body weight
ratio, and pathological examination of urinary system. The birds fed on high
dietary calcium and low phosphorus revealed hypercalcaemia and hypophosphataemia
in their sera. The FCR and mean kidney:body weight ratio of treatment groups was
higher than the control group. The urinary system of the treated birds, in
general, displayed inflammatory lesions, showingabnormalities of colour, size, shape and texture of kidneys and ureters.
The ureters also showed occlusion and distention. The microscopic examination of
the kidneys showing gross pathological lesions revealed common histopathological
changes in glomeruli, tubular cells and interlobular veins.