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Effects of exercise stress on various immune functions in horses
1992
Wong, C.W. | Smith, S. E. (Susan E) | Thong, Y.H. | Opdebeeck, J.P. | Thornton, J.R.
Chemotactic locomotion and luminol-dependent chemiluminescence of neutrophils, mitogen-induced lymphocyte blastogenesis, serum cortisol concentration, immunoglobulin quantification, and leukocyte counts were determined to evaluate the effect of a single strenuous exercise in horses. Increased serum cortisol concentration (P < 0.01) and an increased neutrophil-to-lymphocyte ratio P < 0.05) indicated that horses had been stressed. The chemotactic index and peak chemiluminescence production decreased significantly (P < 0.05 and P < 0.01, respectively) 1 day after exercise. Mitogen-induced blastogenesis of lymphocytes and serum immunoglobulin values remained unchanged in response to exercise. Results of this study indicated that a single bout of exercise may transiently impair neutrophil antimicrobial functions and nonspecific defense mechanisms, but not specific immunity in horses.
Show more [+] Less [-]Effects of estradiol 17-beta implants on hematologic values and the chemiluminescence response of neutrophils of steers
1992
Angel, K.L. | Schumacher, J. | Wolfe, D.F. | Klesius, P.H. | Tyler, J.W. | Carson, R.L.
The effects of subcutaneous administration of a commercially available estradiol 17 beta implant on hematologic values and the chemiluminescence response of neutrophils were evaluated in 14 steers. Chemiluminescence and hematologic values were measured in treated (n = 8) and nontreated (n = 6) steers on days -14, -7, and -1 prior to implantation. Estradiol 17 beta was implanted into the treated group of steers on day 0, and blood samples were obtained from all steers on days 1, 2, 3, 4, 8, 15, 22, 29, 36, 43, and 50. The concentration of estrogen in serum was significantly (P = 0.0120) higher following implantation. Chemiluminescence and hematologic indices were not significantly affected by either implant status or serum concentrations of estrogen. The results of this study suggested that the use of implants containing estradiol 17 beta for promotion of weight gain in steers will not result in alterations of hematologic values or the neutrophil respiratory burst.
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