Effect of chronic heat stress on the urinary system pathology of broilers
2003
Worapol Aengwanich(Mahasarakham University, Maha Sarakham (Thailand). Faculty of Technology. Department of Agricultural Technology. Div. of Animal Production Technology) | Suchint Simaraks(Khon Kaen University, Khon Kaen (Thailand). Faculty of Agriculture. Department of Animal Science)
Thirty six, one day old broiler chicks were obtained from a commercial hatchery. They were brooded for 20 days before being placed in layer cages, with a wire floor, at 26-28 deg C, for a 7 day adaptation period. On day 28, the broilers were transferred into environmentally controlled housing, at 26-28 deg C, and were subjected to heat stress for 5 hrs, at a temperature of 33+-1 deg C, each days, for 21 days. Fifteen birds were then randomly killed by cervical dislocation for macroscopic and microscopic examination of the urinary system. The results revealed that the ureters in 9 out of 15 broilers showed a sac like expansion. The sacs were filled with urine similar to the bladder seen in mammals. The space in the renal tubular lumen increased in size with an accumulation of water. The kidneys showed generalized hemorrhagic changes especially in the renal papillae and the renal tubular and subrenal capsules. Fatty degeneration could be observed in all the renal tubular epithelium. Leukocytes accumulated in many inflamed areas in the kidneys.
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