The study sought to evaluate whether truck-transportation had an impact on the respiratory immune system of cattle. Six castrated 6-10-month-old Holstein calves were shipped approximately 100 km by road for 4 h. Plasma and bronchoalveolar lavage (BAL) fluid samples, collected immediately before transportation, at 4 h (soon after transportation), and on days 3 and 7 after transportation, were examined. A marked elevation of plasma cortisol concentration was observed at 4 h, but this level was unchanged in controls. The chemiluminescence (CL) response of phagocytes in BAL fluid cells, composed mainly of alveolar macrophage, decreased significantly after transportation (P<0.05). Transportation increased the CD3+ T cell population significantly (P<0.05), and a significant increase (P<0.05) in the ratio of CD4+ to CD8+ cells in BAL fluid was evident. We conclude that short-term road transportation alters pulmonary cells and their function, which may engender bovine respiratory disorders.
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