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PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2006-5-26
pubmed:abstractText
Baseline concentrations of LH and testosterone (T) in blood, their pulses, and LH and T response to GnRH (5 microg/kg) treatment were compared in 19 sexually sound male beagles and in 2 sexually dysfunctional dogs. The intact beagles were allocated to 4 groups according to age, which ranged from pubertal 7-mo-old animals to 11-yr-old adults. Baseline concentrations of LH and T were measured every 15 min for a period of 6 h and for a further 3 h following challenge with GnRH. Both LH and T were released in a pulsatile fashion with a wide range of pulse frequency and amplitude. The time intervals between the LH and T pulses ranged from 30 to 60 min, with no significant difference between groups. However, LH concentrations were significantly higher (P<0.01) and T values were markedly lower in the 7-mo-old pubertal dogs than in the other age groups. Following GnRH administration, LH peaked within 15 to 30 min in all the animals, with a significantly higher increase occurring in the pubertal group (P<0.05). Peak T values occurred 15 to 105 min after the LH peaks, with no clear increases occurring in the pubertal dogs. In the 2 sexually dysfunctional animals, LH levels increased following GnRH treatment; however, T values remained extremely low both before and after treatment, indicating loss of Leydig cell function.
pubmed:language
eng
pubmed:journal
pubmed:status
PubMed-not-MEDLINE
pubmed:month
Feb
pubmed:issn
0093-691X
pubmed:author
pubmed:issnType
Print
pubmed:day
2
pubmed:volume
41
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
737-45
pubmed:year
1994
pubmed:articleTitle
Spontaneous and GnRH-induced pulsatile LH and testosterone release in pubertal, adult and aging male beagles.
pubmed:affiliation
Institut für Reproduktionsmedizin, Tierärztliche Hochschule Hannover, Bischofsholer Damm 15, D-30173 Hannover, Germany.
pubmed:publicationType
Journal Article