Linked Life Data

17981409

Source:http://linkedlifedata.com/resource/pubmed/id/17981409

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3-4
pubmed:dateCreated
2008-9-15
pubmed:abstractText
The effect of days after calving on IGF-I, IGFBP, progesterone, androstenedione, estradiol, and aromatase mRNA in dominant ovarian follicles (DF) was evaluated in Angus x Hereford cows. Growth of DF (>9 mm) was monitored daily by ultrasonography and fluid from DF was collected in vivo at either 30+/-2 d or 47+/-2 d postpartum. Follicular fluid (FF) was also aspirated from DF of contemporary ovulatory cows at proestrus. Estrous behavior was monitored continuously using the HeatWatch system, and progesterone in plasma collected twice weekly was used to assess luteal activity. Anovulatory DF aspirated 30 and 47 d postpartum had similar concentrations of IGF-I, IGFBP, progesterone, estradiol and androstenedione in FF and IGF-I and IGFBP in plasma. The intervals from aspiration to estrus were similar for cows aspirated 30 and 47 d postpartum. Proestrous follicles had greater (P<0.01) estradiol (435+/-79 ng/mL) than DF at 30 d (107+/-63 ng/mL) or 47 d (68+/-53 ng/mL) after calving. Concentrations of androstenedione in FF were also greater (P<0.01) in proestrous follicles than in DF aspirated at 30 or 47 d after calving. Concentrations of insulin-like growth factor-1 (IGF-I) and insulin-like growth factor binding proteins (IGFBP) in FF and plasma, and aromatase mRNA in granulosa cells were similar for anovulatory and proestrous cows. In conclusion, estradiol production by DF of postpartum anovulatory cows may be limited by inadequate production of androstenedione during the postpartum anovulatory interval and this may influence follicular maturation. Concentrations of IGF-I and IGFBP were similar in anovulatory and proestrous cows, an indication that alterations in the IGF-I system in the DF at 30-47 d after calving are not associated with delayed follicular development in postpartum beef cows.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
1873-2232
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
108
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
364-74
pubmed:meshHeading
pubmed:year
2008
pubmed:articleTitle
Effect of days after calving on insulin-like growth factor-I, insulin-like growth factor binding proteins, progesterone, androstenedione, estradiol, and aromatase mRNA in dominant follicles of postpartum beef cows.
pubmed:affiliation
Department of Animal Science, Oklahoma Agricultural Experiment Station, Stillwater, OK 74078-0425, USA.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't