SHORT COMMUNICATION Pathology of heart, lung, liver and kidney in broilers under chronic heat stress

Aengwanich, W. and Simaraks, S. Pathology of heart, lung, liver and kidney in broilers under chronic heat stress Songklanakarin J. Sci. Technol., 2004, 26(3) : 417-424 The purpose of this experiment was to investigate pathological changes in broilers under chronic heat stress. Fifteen birds (n = 15), twenty-eight days old were kept at 33 + 1oC environmental temperature for 21 days. While broilers were maintained in environmental temperature at 33 + 1 oC, body temperature, respiratory rate and urine excretion rose. Macroscopic and microscopic lesions of heart, lung, liver and kidney were examined. Right atrium hypertrophy with excessive blood accumulation, heart enlargement and right ventricular hypertrophy were observed in 12 out of 15 broilers (80%). Congestion, edema and hyperemia in lung were present in all broilers. Yellow and pale livers were observed in 4 out of 15 broilers (26.67%). Kidneys were highly affected i.e. generalized edema and hemorrhage in subrenal capsule. Under microscopic examination of heart, massive myofibrillar degeneration with hemorrhage, general fatty degeneration /or/ vacuolation of myofibers and diffused myocarditis containing organisms were found in some areas. The principal histopathologic lesions in the lung were related to vein and arteriole massive congestion. Massive hemorrhage was largely observed in parabronchus and alveoli of all broilers. Liver cells showed “fatty degeneration” with dilation of sinusoid of all broilers. Besides, necrosis with heterophils and lymphocytes was observed in some parts of the liver, especially in the centritubular region. In the 1D.V.M. (Physiology), Division of Animal Production Technology, Department of Agricultural Technology, Faculty of Technology, Mahasarakham University, Maha Sarakham 44000, 2D.V.M., Ph.D. (Physiology of Reproduction), Assoc. Prof., Department of Animal Science, Faculty of Agriculture, Khon Kaen University, Khon Kaen 40002, Thailand. Corresponding e-mail: [email protected] Received, 21 August 2003 Accepted, 14 January 2004 Songklanakarin J. Sci. Technol. Vol. 26 No. 3 May-Jun. 2004 418 Pathology of heart, lung, liver and kidney in broilers under stress Aengwanich, W. and Simaraks, S. kidney, leukocytes such as heterophils accumulated in many inflammatory areas. Fatty degeneration was observed in renal tubular epithelia of all broilers. Glomeruli were damaged. A space between renal papillae increased and accumulated water. Moreover, ureters in 9 out of 15 (60%) birds showed sac-like expansion “ureteral pseudobladder”. These sacs were filled with urine and similar to bladder in mammals.