Endocrine Activities of the Blastocyst and Early Embryonic Tissue in the Pig

Heap, R. B.; Perry, J. S.; Gadsby, John E.; Burton, Robert D.

doi:10.1042/bst0031183

Cited by 32 publications

(15 citation statements)

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“…Heap, Perry, Gadsby & Burton (1975) have suggested that the sudden onset of oestrogen synthesis by the pig blastocyst between Days 10 and 12 post coitum, coinciding with the time of maternal recognition of pregnancy, may act as an embryonic signal to prolong luteal function at this time. The present demonstration of a lack of a direct luteotrophic action for oestradiol on the corpus luteum of the early pregnant pig suggests that an embryonic oestradiol signal is relatively short-lived and that the primary action of the steroid is probably its ability to cause LH release (Henricks, Guthrie & Handlin, 1972;Robertson & King, 1974;Perry et al, 1976).…”

Section: Discussionmentioning

confidence: 99%

Progesterone secretion by the corpus luteum of the early pregnant pig during superfusion in vitro with PGF-2 , LH and oestradiol

Watson¹,

Walker²

1978

Reproduction

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Section: Discussionmentioning

confidence: 99%

Progesterone secretion by the corpus luteum of the early pregnant pig during superfusion in vitro with PGF-2 , LH and oestradiol

Watson¹,

Walker²

1978

Reproduction

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“…In fact, estradiol-17β in uterine secretions is considered as a reliable index of the estradiol-17β content in the conceptuses at this stage of gestation (Youngs et al 1994). hypothesized that conceptuses from sows fed a supplement of folic acid were more mature than those from control sows at the same stage of gestation; filamentous blastocysts which are more advanced in the development (Heap et al 1975;Fischer et al 1985) produce less estrogens per unit of tissue in vitro than tubular blastocysts.…”

Section: Uterine and Conceptus Measurementsmentioning

confidence: 99%

Pre- and post-mating dietary supplements of folic acid and uterine secretory activity in gilts

Duquette¹,

Matte²,

Farmer³

et al. 1997

Can. J. Anim. Sci.

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-P. 1997. Pre-and post-mating dietary supplements of folic acid and uterine secretory activity in gilts. Can. J. Anim. Sci. 77: 415-420. The present study was carried out to determine the effects of pre-and (or) post-mating dietary supplements of folic acid on uterine secretions and secretory activity on day 12 of gestation. Crossbred gilts were assigned randomly to three treatments: SS) a dietary supplement of 15 mg of folic acid kg -1 of diet from the estrus before mating (approximately day -21) until day 12 of gestation (n = 9), 0S) the same folic acid supplement from mating (day 0) to day 12 of gestation (n = 10), and 00) no supplement of folic acid (n = 10). At slaughter (day 12 of gestation), one uterine horn was flushed with 20 mL of PBS to collect embryos and uterine flushings, while samples of uterine tissue were collected from the other horn. Supplementary folic acid (0S and SS) increased total folates in uterine flushings (P ≤ 0.05) as well as concentrations of folates in the endometrium (P ≤ 0.0004) and in the whole uterine tissue (endometrium + myometrium: P ≤ 0.0001). Total amounts of prostaglandin (PG)E 2 and PGF 2α in uterine flushings were not affected (P ≥ 0.8) by any treatment but estradiol-17β was numerically 40% lower (P ≥ 0.12) in uterine flushings of 0S and SS sows. Samples of endometrium (15-17 mg) were cultured for 2 to 7 h. Concentrations of PGE 2 and PGF 2α in the culture medium increased with the duration of incubation (P ≤ 0.0001) but there was no treatment effect (P ≥ 0.4). The inconsistency between the folic acid response seen in the present study and in previous results using multiparous sows suggests that the impact of this vitamin on sow reproduction might be linked to the parity (and/or prolificacy) of the animal. . L'objectif de la présente étude visait à déterminer l'effet de compléments alimentaires d'acide folique avant et (ou) après la saillie sur certains aspects de la composition des sécrétions utérines et sur la fonction sécrétrice de l'utérus à 12 jours de gestation chez des truies primipares. Vingt neuf cochettes ont été assignées à trois traitements: SS) un complément alimentaire d'acide folique de 15 ppm à partir de l'oestrus précédant la saillie fécondante (environ -21 jours) jusqu'à 12 jours de gestation (n = 9), 0S) le même complément offert à partir de la saillie jusqu'à 12 jours de gestation (n = 10) et 00) aucun complément d'acide folique dans l'aliment. L'une des deux cornes utérines a été utilisée pour la récolte des embryons et du liquide utérin en vue des dosages hormonaux et métaboliques alors que l'autre corne a servi à la collecte du tissu endométrial. Les concentrations en folates de l'endomètre + myomètre et le contenu total en folates des sécrétions utérines étaient plus élévées (P ≤ 0,05) chez les truies 0S et SS comparativement aux truies 00. Les quantités totales de prostaglandine (PG)E 2 et de PGF 2α dans le liquide utérin n'étaient pas affectées (P ≥ 0,8) par les traitements mais celles de l'oestradiol-17β étaient numériquement 40% plus basse (P...

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“…Previous studies on oestrogen production by pig conceptuses (Perry et al, 1973;Heap et al, 1975;Guthrie & Lewis, 1986) (Gadsby & Heap, 1978). An optimum uterine microenvironment is required for embryonic development (Geisert et ai, 1982;Morgan et al, 1987) and the differential rate of oestrogen production by individual regions of the blastocyst may provide a local stimulus for adjacent endometrium.…”

Section: Discussionmentioning

confidence: 99%

Production of oestrone and oestradiol-17 by different regions of the filamentous pig blastocyst

Bate

King²

1988

Reproduction

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Endocrine Activities of the Blastocyst and Early Embryonic Tissue in the Pig

Cited by 32 publications

References 0 publications

Progesterone secretion by the corpus luteum of the early pregnant pig during superfusion in vitro with PGF-2 , LH and oestradiol

Progesterone secretion by the corpus luteum of the early pregnant pig during superfusion in vitro with PGF-2 , LH and oestradiol

Pre- and post-mating dietary supplements of folic acid and uterine secretory activity in gilts

Production of oestrone and oestradiol-17 by different regions of the filamentous pig blastocyst

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