Adrenal cortical activity in sheep as measured by urinary 17-ketogenic steroid excretion

Robinson K.W. and Morris L.R. (1960) Adrenal cortical activity in sheep as measured by urinary 17-ketogenic steroid excretion. Australian Journal of Agricultural Research, 11 2: 236-246. doi:10.1071/AR9600236


Author Robinson K.W.
Morris L.R.
Title Adrenal cortical activity in sheep as measured by urinary 17-ketogenic steroid excretion
Journal name Australian Journal of Agricultural Research   Check publisher's open access policy
ISSN 0004-9409
Publication date 1960
Sub-type Article (original research)
DOI 10.1071/AR9600236
Volume 11
Issue 2
Start page 236
End page 246
Total pages 11
Subject 1100 Agricultural and Biological Sciences
Abstract The effects of a number of stimuli on adrenal activity in sheep were assessed from measurements of the output of urinary 17-ketogenic steroids (17-KGS). Evidence for the claim that 17-KGS excretion in sheep reflects adrenal cortical activity was provided by observations that injections of ACTH produced a marked rise in concentration of these steroid metabolites in the urine.A seasonal rhythm in the urinary excretion of 17-KGS was observed. The peak winter output of these steroids was eight times that found in midsummer. This pattern of adrenal activity appears to be temperature- and not light-induced.In the pregnant ewe, the urinary 17-KGS output followed normal seasonal fluctuations over the greater part of gestation. However, a sudden drop in values occurred during the 2 weeks prior to lambing. This was followed by a progressive rise post partum which was dependent on active lactation. The pre-partum fall in steroid excretion was also observed in pregnant ewes undergoing daily ACTH therapy. The significance of these findings is discussed.Pregnancy appears to modify the response of sheep to repeated intramuscular injections of ACTH. The steroid excretion rate was related to the dosage level of ACTH in both pregnant and non-pregnant ewes although gestation markedly reduced the total output. There was no evidence of adrenal atrophy with repeated cortisone injections over 8 weeks, but endogenous ACTH release appeared to be delayed when daily ACTH injections were discontinued. Injections of 300 mg cortisone acetate and 50 i.u. of ACTH, over a period, gave comparable excretion rates of 17-KGS in non-pregnant ewes.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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