Linked Life Data

3181867

Source:http://linkedlifedata.com/resource/pubmed/id/3181867

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
8
pubmed:dateCreated
1988-11-29
pubmed:abstractText
A study was designed to determine if the bull testes secretes estradiol-17 beta, as has been reported for several other species. Two experiments were conducted. In the first experiment, five Angus-sired crossbred bulls were fitted with catheters in the spermatic and jugular veins and sampled every 15 min for six hours. One was bled from three cannula, the third being in the spermatic artery. In the second experiment, these same bulls were castrated and jugular vein blood was collected at timed intervals for two hours. Plasma samples were assayed for estradiol-17 beta (E2) and testosterone (T) using highly specific radioimmunoassays. This experiments gave evidence that: a. Concentrations of E2 were significantly lower (P less than .05) in the jugular vein than the spermatic vein in each of the five bulls, although the mean concentration for all bulls was not great for either vein nor was the difference great between the two veins. In confirmation of past studies, T concentration in the jugular vein was much lower than in the spermatic vein in each bull as was overall mean. b. Removal of the testes caused E2 to decrease during the 25 min post-castration but the difference was not significant (P greater than .05), whereas T decreased 4-fold (P less than .01). During the next 95 min., the concentrations of both hormones increased 3- and 6-fold, respectively, as did cortisol concentration. It is concluded that the bull testes secretes E2, but the secretion is minor to that of T and that another source of both hormones can be the adrenal gland, such as during stress.(ABSTRACT TRUNCATED AT 250 WORDS)
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0018-5043
pubmed:author
pubmed:issnType
Print
pubmed:volume
20
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
494-7
pubmed:dateRevised
2009-2-19
pubmed:meshHeading
pubmed:year
1988
pubmed:articleTitle
A study of the source of estradiol-17 beta in the bull.
pubmed:affiliation
Clemson University, Animal Science Department, South Carolina.
pubmed:publicationType
Journal Article