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Clinical, hematological, biochemical, and hormonal parameters of cattle submitted to heat stress


Clinical, hematological, biochemical, and hormonal parameters of cattle submitted to heat stress



Arquivo Brasileiro de Medicina Veterinaria e Zootecnia 61(4): 769-776



ISSN/ISBN: 0102-0935

DOI: 10.1590/s0102-09352009000400002

Clinical, haemathological, biochemical, and hormonal parameters were characterized in 39 males and 32 females crossbred cattle (1/2 Holstein x 1/2 Gir), averaging 14 to 20 months of age, submitted to thermoneutrality (22 degrees C and 70% of RH) and heat stress (42 degrees C and 60% RH) in summer and winter in climatic chamber. At clinical examination, all animals presented salivation and ocular globe retraction. Under heat stress, animals increased erythrocytes count, hemoglobin total concentration, hematocrit, concentraction of total proteins, urea, creatinin, sodium, potassium, chlorides, cortisol, urinary pH and density, and dry matter of feces (P<0.05). The increase of all these variables was more evident in the summer. The values of gamma-glutamil transferase and aspartate aminotransferase increased under stress only in the summer (P<0.05), been potassium blood concentration constant during the seasons (P>0.05). It was concluded that hematology, biochemical, and hormonal parameters are important to characterize the heat stress in cattle.

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Accession: 066226697

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