Linked Life Data

8924498

Source:http://linkedlifedata.com/resource/pubmed/id/8924498

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1996-10-31
pubmed:abstractText
Young of short-day-responsive (SDR/Y) and short-day-nonresponsive (SDNR/Y) Siberian hamsters were reared in a long (16L:8D) photoperiod. At weaning, males from both lineages were maintained in 16L:8D or transferred to a short (12L:12D) photoperiod; body weight and testis size were measured every 7-10 days until 45 or 140 days of age. Contrary to expected results, juvenile SDNR/Ys responded to the inhibitory effects of the shorter photoperiods with decreased body weight and inhibited testicular growth. Under the long photoperiods, SDR/Y and SDNR/Y animals exhibited accelerated body weight gains and testicular growth from 18 to 69 days of age. Beginning at 69 days of age, however, SDNR/Ys exhibited a transient decrease in testis size that troughed at 86 days of age; testis growth subsequently resumed. Consistent with their ability to respond to short photoperiods, SDNR/Y young, in a second experiment, showed locomotor activity patterns similar to those of SDR/Ys in short days (9L:15D). It was only in adult SDNR/Ys that the delayed onset of activity characteristic of nonresponders was apparent. These results indicate that the circadian system of nonresponders changes with age, rendering animals nonresponsive to short photoperiods. The period of transient testicular decline observed in SDNR/Ys housed in 16L:8D may mark a critical period in the onset of these changes; additional studies are required to test this hypothesis.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0006-3363
pubmed:author
pubmed:issnType
Print
pubmed:volume
54
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
789-99
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1996
pubmed:articleTitle
Testicular growth and locomotor activity of Siberian hamsters from short-day-responsive and short-day-nonresponsive lineages.
pubmed:affiliation
Department of Biological Sciences, Kent State University, Ohio 44242, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S.