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Various stressors significantly increase urinary excretion of chromium (Cr), suggesting that Cr may be physiologically linked to the responses to control stress. The aim of this study was to determine the physiological responses of buffalo calves to increased Cr supply under low ambient temperature. In a randomized complete block design, twenty-four Murrah buffalo calves were assigned to 4 treatments for a period of 120 days. Treatments included either no supplemental Cr (control), 0.5 mg of supplemental Cr/kg DM, 1.0 mg of supplemental Cr/kg DM, or 1.5 mg of supplemental Cr/kg DM. Buffalo calves were monitored daily for physiological variables, dry matter intake (DMI) and fortnightly for body mass change. Blood samples were collected at fortnightly intervals and analyzed for the biomarkers of immunity and plasma trace mineral concentration. At the end of the 120 day experimental period, a 7 day metabolic trial was conducted. The average temperature-humidity index (THI) and relative humidity (RH) during the study were 58.10 units and 52.0% respectively. Physiological variables, DMI and growth performance did not differ among all treatments. 1.5 mg Cr/kg DM increased B and T-cell proliferation, neutrophil phagocytic activity and ferric reducing antioxidant power (FRAP) value, whereas plasma total immunoglobulin (TIg) and immunoglobulin G (IgG) *Corresponding author: Muneendra Kumar, Assist. Prof., Department of Animal Nutrition, College of Veterinary Science and Animal Husbandry, DUVASU, Mathura 281001, India, Mobile number: +91 90 4554 6435; E-mail address: muneendra82@gmail.com

veterinarski arhiv

Supplemental chromium in cold-stressed buffalo calves (Bubalus bubalis): effects on growth performance, nutrient utilization and cell mediated and humoral immune response