Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Relationship between maternal endocrine environment, early embryo development and inhibition of the luteolytic mechanism in cows
Autore:
Mann, GE; Lamming, GE;
Indirizzi:
Univ Nottingham, Sch Biosci, Div Anim Physiol, Loughborough LE12 5RD, Leics, England Univ Nottingham Loughborough Leics England LE12 5RD 2 5RD, Leics, England
Titolo Testata:
REPRODUCTION
fascicolo: 1, volume: 121, anno: 2001,
pagine: 175 - 180
SICI:
1470-1626(200101)121:1<175:RBMEEE>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
EARLY-PREGNANCY; ESTROUS-CYCLE; CONCEPTUS DEVELOPMENT; LUTEINIZING-HORMONE; PROGESTERONE; PLASMA; CATTLE; EXPRESSION; OVULATION; OXYTOCIN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Mann, GE Univ Nottingham, Sch Biosci, Div Anim Physiol, Loughborough LE12 5RD, Leics, England Univ Nottingham Loughborough Leics England LE12 5RD ics, England
Citazione:
G.E. Mann e G.E. Lamming, "Relationship between maternal endocrine environment, early embryo development and inhibition of the luteolytic mechanism in cows", REPRODUCT, 121(1), 2001, pp. 175-180

Abstract

In this study, the relationship between maternal hormone environment and early embryo development in mature non-lactating Holstein-Friesian cows was investigated. Animals were inseminated at either 72 and 96h after prostaglandin injection (n = 23) or were left as uninseminated controls (n = 10). Plasma samples were collected once a day from the first day of insemination (day 1) until day 16, when the cows underwent an oxytocin challenge, and were then slaughtered and their reproductive tracts removed. The tracts were flushed to collect embryos and the flushes were measured for interferon tau (IFN-tau) activity. Inseminated cows without an embryo on day 16 (n = 5) underwent both delayed ovulation (indicated by delayed decrease in oestradiolconcentrations) and a delayed increase in progesterone concentrations after ovulation compared with cows with an embryo on day 16 (n = 15). Within the group of cows with an embryo, those with poorly developed embryos producing undetectable concentrations of IFN-tau (n = 7) had similar oestradiol profiles but underwent a delayed progesterone increase after ovulation compared with cows with well developed embryos producing measurable quantities ofIFN-tau (n = 8). In the cows with an embryo, the plasma concentration of 13,14-dihydro-15-keto PGF(2 alpha), the principal metabolite of PGF(2 alpha), after injection of oxytocin was lower than that of control cows and cows without an embryo. However, when the cows with an embryo were compared on the basis of production of embryonic IFN-tau, the PCF2 alpha response to oxytocin was attenuated completely in cows that had measurable IFN-tau activity, whereas a response of similar magnitude to that in control cows and cowswithout an embryo was observed in those with undetectable IFN-tau activities. In conclusion, the successful maternal recognition of pregnancy in cowsdepends on the presence of a sufficiently well developed embryo producing sufficient quantities of IFN-tau, which is, in turn, dependent on an appropriate pattern of maternal progesterone secretion.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/07/20 alle ore 20:23:11