Effect of Inorganic Chromium on the Stress Response of Lambs to Weaning, Transport and a New Environment

I.YANCHEV, D. GUDEV, S. RALCHEVA, I. KOZELOV and P. MONEVA
Institute of Animal Science, BG-2230 Kostinbrod, Bulgaria

Abstract

YANCHEV, I., D. GUDEV, S. RALCHEVA, I. KOZELOV and P. MONEVA, 2003. Effect of inorganic chromium on the stress response of lambs to weaning, transport and a new environment. Bulg. J. Agric. Sci., 9: 251–255

The primary objective of this study was to investigate the effect of supplemental chromium, given as Cr2(SO4)3 on the extent of the adrenal response to stress in lambs exposed to weaning, transportation and rearing in a new environment. Additionally the role of chromium on the biochemical markers-glucose and lactate, was investigated, because both glucose and lactate production are closely related to the amount of stress experienced by the lambs. Eight 90 days old lambs were randomly assigned to two groups – experimental chromium supplemented (n = 4) and control (n = 4). Blood samples were taken by jugular venipuncture on day 1, 3, 6 and 9, after placement of the lambs in a new environment. Supplemental lambs had lower (P < 0.05) concentration of cortisol on day 3 and a trend towards lower cortisol level at day 6 and 9. Supplemental inorganic chromium did not influence plasma glucose and lactate level.

Key words: chromium, stress, cortisol, glucose, lambs