Serum copper, zinc, calcium and phosphorus concentrations of calves stressed by bovine respiratory disease and infectious bovine rhinotracheitis.

Abstract

The relationship between serum minerals and stress and(or) disease has not been fully evaluated in beef cattle. Two trials were conducted to determine the changes in serum Cu and Zn during market-transit stress and(or) disease. Two additional trials were conducted to determine the changes in serum Cu and Zn after inoculation with infectious bovine rhinotracheitis virus (IBRV), with one of the trials determining the changes in serum Ca and P. Trials 1 (n = 80) and 2 (n = 100) utilized calves that were handled through a normal market-transit system and transported 1,967 km to the feedlot. Trials 3 (n = 37) and 4 (n = 8) used calves that were sero-negative to IBRV and then challenged with 2.7 x 10(5) plaque-forming units of the virus. Serum samples were collected at specified intervals and serum minerals were measured for each trial. Serum Zn for morbid or IBRV-challenged calves was decreased by 34, 57, 29 and 15% (P less than .05) for the four trials, respectively, at peak morbidity. Serum Cu of morbid or IBRV-challenged calves increased 5, 15, 40 and 33% for the four trials, respectively, at peak morbidity. Feed intakes were lower during morbidity for market-transit trials and after IBRV inoculation. Lower feed intake could partially explain the decrease in serum Zn; however, when feed intake was held constant, serum Zn concentration still decreased. Serum Zn decreased and serum Cu increased during market-transit morbidity or after IBRV.

Serum Concentration of Copper, Zinc, Iron, and Cobalt and the Copper/Zinc Ratio in Horses with Equine Herpesvirus-1

“…They stated the decreased serum zinc concentrations and the increased serum copper concentrations. Similar results in the calves were stressed by bovine respiratory disease and infectious bovine rhinotracheitis [27]. In the present study, zinc concentration in the infected group was significantly lower than in the control group.…”

Effects of copper source and concentration on copper status and immune function in growing and finishing steers

“…Illness can put tremendous amount of stress on the body and cause the body to try to rid itself of the illness. Increased excretion of minerals in urine during stress has been shown (Orr et al, 1990) Nockels et al (1993 reported that when supplementing CuLys or CuS0 4 to eight Charolais crossbred steer calves, upon feed and water removal (stressor), CuLys was retained more in the body than CuS0 4 . This could explain why organic sources of Cu are believed to be more available than inorganic sources of Cu during a stressed period.…”

Concentração plasmática de cortisol, uréia, cálcio e fósforo em vacas de corte mantidas a pasto suplementadas com levedura de cromo durante a estação de monta

“…Já no presente trabalho, o fator estressante foi a condição climática (temperatura e umidade elevadas), mostrando que o cromo poderia agir como um elemento atenuador dos efeitos desfavoráveis provocados pelo estresse térmico, confirmando a sugestão de MERTZ (1974) de considerar o cromo como um elemento antiestresse. ORR et al (1990) demonstraram que a concentração plasmática de fósforo, cálcio e outros elementos minerais diminui significativamente em animais estressados. Os resultados deste trabalho (Tabelas 3 e 4) indicaram que, quando os animais foram submetidos a estresse, provocado pelo clima cálido e úmido e o manejo, durante a estação de monta (detecção de cio, inseminações), os valores de fósforo e cálcio foram menores no grupo controle somente durante o primeiro período de colheita, quando a temperatura ambiente e a umidade relativa do ar foram mais elevadas (Tabela 1), sendo que, inclusive no caso do fósforo, o valor do grupo controle foi menor que o nível crítico sugerido por McDOWELL (1992).…”