Functional characteristics of the bovine hypothalamic-pituitary-adrenal axis vary with temperament.
作者： Kevin O. Curley , Don A. Neuendorff , Andrew W. Lewis , Jason J. Cleere , Thomas H. Welsh
DOI: 10.1016/J.YHBEH.2007.08.005
关键词: Psychology 、 Stimulation 、 Internal medicine 、 Hypothalamic–pituitary–adrenal axis 、 Analysis of variance 、 Adrenal function 、 Temperament 、 Brahman 、 Endocrinology 、 Adrenocorticotropic hormone 、 Acth challenge
摘要: Hypothalamic-pituitary-adrenal (HPA) axis function, in Brahman heifers of differing temperament, was evaluated using separate challenges with CRH and ACTH. Exit velocity (EV) measurement used to classify heifer temperament as calm [C; consisted 6 slowest (EV=1.05+/-0.05 m/s)] or temperamental [T; fastest (EV=3.14+/-0.22 m/s)]. During the h prior challenge, areas under ACTH (P=0.025) cortisol (P<0.001) curves were greater heifers. Baseline but not (P=0.10) differed between groups. Following (P=0.057) (P<0.01) response animals. The same animals subjected an challenge 14 d following their utilization stimulation experiment. Prior baseline concentrations higher (T=18+/-2.6, C=4.3+/-0.6 ng/mL). administration, area curve (P=0.07) After declining below during post-challenge recovery period, again (P=0.02) than These data demonstrate that cattle excitable exhibit increased stress responsiveness handling, adrenal function basal pituitary a muted pharmacological stimulus. Thus, functional characteristics HPA vary animal temperament.
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