Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:dateCreated
2006-7-26
pubmed:abstractText
This review is a short summary of the "state-of-the-art" regarding the ontogeny of LH and part of its control system in the pig. The maturity of pituitary gonadotropin cells and the vascular drainage between the hypothalamus and pituitary are probably the most important steps in the developmental process of gonadotropin (LH) secretion. In the pig, these are achieved at around day 80 of foetal age, when LH cell density is comparable to that observed in adults. The hypothalamus regulates foetal pituitary LH secretion via LHRH well ahead of parturition. However, the main prerequisite of ovarian activity (ovulation), the "GnRH pulse generator", is not ready to function in the foetus. Pulsatile LH release is inducible by treatment of the foetal pituitary with LHRH, but extrahypothalamic modulating systems are not fully functioning until after birth. Likewise, there is no gonadal steroid feedback control of pituitary LH secretion up to the second week of neonatal age.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:author
pubmed:volume
62
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
19-32
pubmed:meshHeading
pubmed:year
2006
pubmed:articleTitle
Foetal and neonatal development of luteinising hormone and its regulatory systems in the pig.
pubmed:affiliation
Department of Functional Genomics and Bioregulation, Institute of Animal Science Mariensee, Federal Agricultural Research Centre (FAL), 31535 Neustadt, Germany. parvizi@tzv.fal.de
pubmed:publicationType
Journal Article, Review, Research Support, Non-U.S. Gov't