Linked Life Data

2685798

Source:http://linkedlifedata.com/resource/pubmed/id/2685798

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
10
pubmed:dateCreated
1990-1-8
pubmed:abstractText
Molt induced by infusion of a gonadotropin-releasing hormone agonist (GnRH-A, ([D-Leu6,Pro9]-GnRH N-ethylamide]) has been used as a model for studying the endocrine mechanisms of molting. Molt induced by GnRH-A was also compared with that induced by feed withdrawal (FW). Thirty-three laying hens were divided into three groups: 1) sham infused (controls), 2) molted by GnRH-A infusion (GnRH-A), or 3) molted by FW. All groups had reduced day length. Birds were weighed and blood was sampled twice per week. Plasma was assayed for thyroxine (T4), triiodothyronine (T3), and progesterone (P4); egg production was recorded. A separate group of GnRH-A molted (n = 8) and control (n = 4) hens were killed during the molt and liver, ovary, and oviduct were weighed. Plasma T4 concentrations were elevated (P less than .01), whereas plasma T3 did not change and plasma P4 decreased (P less than .05) in the GnRH-A group compared with the control group. Plasma T4 was higher (P less than .05) in the GnRH-A group than in the FW group, whereas plasma T3 was higher (P less than .05) in the FW group than in the GnRH-A group. Plasma P4 concentrations declined to similar low levels in the GnRH-A and FW groups. The GnRH-A caused weight loss (P less than .05) from the ovary, oviduct, and liver. The GnRH-A-molted hens lost less BW (P less than .001) and were out of lay for 12 days less than FW-molted hens. Postmolt rates of lay were not significantly different for the two groups.(ABSTRACT TRUNCATED AT 250 WORDS)
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0032-5791
pubmed:author
pubmed:issnType
Print
pubmed:volume
68
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1402-8
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1989
pubmed:articleTitle
Molt induced by gonadotropin-releasing hormone agonist as a model for studying endocrine mechanisms of molting in laying hens.
pubmed:affiliation
Department of Physiology and Biophysics, University of Illinois, Urbana 61801.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't