Peripheral Plasma Progesterone during Egg Transport in the Rabbit

Spilman, C. H.; Wilks, John W.

doi:10.3181/00379727-151-39294

Cited by 24 publications

(8 citation statements)

References 5 publications

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“…However, the range of values in the current study is similar to that reported by Wu et al (1977a) for pseudopregnant animals and Challis et al (1973) for pregnant rabbits. Waterson & Mills (1976) report higher values during the first 24 h of pregnancy, and the concentrations observed by Spilman & Wilks (1976) are lower than those reported here. The small amount of oestradiol in the serum is also consistent with the relatively low ovarian secretion rates reported by Hilliard & Eaton (1971) and by Spilman et al (1978).…”

Section: Discussioncontrasting

confidence: 91%

“…The peripheral serum levels of progesterone observed in this study are similar to those reported previously for pregnant animals (Challis et al, 1973;Fuchs & Beling, 1974;Thau & Lanman, 1975); but are slightly higher than those reported for pseudopregnant animals (Fuchs & Beling, 1974;Thau & Lanman, 1975;Spilman & Wilks, 1976). The few studies of serum oestradiol levels do not report values for the same days as the present investigation.…”

Section: Discussionsupporting

confidence: 85%

“…There have been numerous studies measuring the steroid concentrations in the serum of rabbits before and after ovulation and one report of the progesterone content of uterine flushings (Challis, Davies & Ryan, 1973;Fuchs & Beling, 1974;Thau & Lanman, 1975;Fowler, Johnson, Walters & Pratt, 1976;Spilman & Wilks, 1976;Waterson & Mills, 1976;Wu, Blasco, Flickinger & Mikhail, 1977a). There have been no reports, however, of the levels of steroids in rabbit oviducal fluid.…”

Section: Introductionmentioning

confidence: 99%

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Steroid concentrations in rabbit oviducal fluid during oestrus and pseudopregnancy

Richardson¹,

Oliphant²

1981

Reproduction

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Summary. The concentrations of progesterone and oestradiol in the oviducal fluid during oestrus and pseudopregnancy were measured. Progesterone concentrations ranged from 0\m=.\55\ m=+-\0\m=.\17 ng/ml during oestrus to a maximum of 2\m=.\86\ m=+-\ 0\m=.\82 ng\ml on Day 12 of pseudopregnancy. Serum progesterone concentrations were similar to those found in oviduct fluid during oestrus, but by Day 12 serum levels had risen to 14\m=.\13\m=+-\1\m=.\97 ng\ml. Daily oviducal fluid oestradiol values ranged from 48\m=.\3\ m=+-\ 6\m=.\4 pg/ml to 119\m=.\7 \ m=+-\23\m=.\6pg/ml and were similar to serum concentrations.

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Section: Discussioncontrasting

confidence: 91%

Section: Discussionsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

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Steroid concentrations in rabbit oviducal fluid during oestrus and pseudopregnancy

Richardson¹,

Oliphant²

1981

Reproduction

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“…Peripheral oestrone concentrations remain low and unchanged throughout pregnancy in rabbits, as do those of oestradiol at least through Day 12 of pregnancy (Challis et al, 1973 (Spilman & Wilks, 1976;Harrington & Rothermel, 1977). Thus, the pattern of increase in uterine PAF concentrations closely mimics the increase in peripheral progesterone concentrations.…”

Section: Introductionmentioning

confidence: 73%

Platelet-activating factor in the rabbit uterus during early pregnancy

Angle

Jones

McManus³

et al. 1988

Reproduction

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Summary. Platelet-activating factor (PAF) concentrations were low in the non-pregnant, oestrous uterus (mean \m=+-\s.e.m.: 2\m=.\2\m=+-\1\m=.\2 pmol/g, n = 3). However, uterine PAF increased dramatically during pregnancy to a maximum of 37\m=.\8\ m=+-\ 4\m=.\90pmol/g (n = 7) on Day 5. By Day 7, PAF concentrations in the uteri of pregnant rabbits had returned to levels similar to those found at oestrus. In contrast, uterine PAF in pseudopregnant rabbits peaked at 30\m=.\6\ m=+-\2\m=.\8pmol/g (n = 8) on Day 4, declined to 20\m=.\5\ m=+-\ 2\ m=. \ 4pmol/g (n = 8) on Day 5 and then remained at that concentration through Day 7. Uterine PAF co-migrated with synthetic PAF 1-0-hexadecyl-2-acetyl-sn-glycero-phosphocholine) in both thin-layer and normal-phase high-performance liquid chromatography. PAF activity in the uterus during pregnancy and pseudopregnancy was found almost exclusively in the endometrium; little or no PAF was found in myometrium, uterine flushings or blastocysts. While no PAF was detected in blastocysts on Days 5 and 6 of pregnancy, the presence of the embryo appears to modulate biosynthesis and/or degradation of PAF by the uterus, since PAF decreased significantly in uterine tissue apposed to the implanting embryo (but not in similar areas between such attachment sites). Increased concentrations of PAF in the preimplantation rabbit uterus followed by a dramatic decrease on the day of blastocyst attachment suggest that this potent inflammatory autacoid may play a vital role in implantation.

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“…The rabbit reproductive tract has been largely studied to determine oestrogen and progesterone mechanisms of action due to the fact that rabbits present reflex ovulation when changes in estradiol and progesterone concentrations are predictible (Challis et al, 1973; Spilman and Wilks, 1976).…”

Section: Introductionmentioning

confidence: 99%

Histomorphological Changes in the Oviduct Epithelium of the Rabbit During Early Pregnancy

Anzaldúa¹,

Cerbón²

2002

Anat Histol Embryol

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In this study, we determined the histomorphological changes in different regions of the oviduct (fimbriae, infundibulum, ampullae and isthmus) during early pregnancy (days 1-4) of the rabbit. It was observed that the number of secretory cells (PAS-positive cells) diminished in the fimbriae during the first 4 days of pregnancy with the corresponding increase in the number of non-secretory cells (PAS-negative cells). In contrast, there was an increase in the number of PAS-positive cells in the isthmus during early pregnancy. In both the infundibulum and the ampullae the number of PAS-positive cells was increased on day 3. A significant decrease in the height of the epithelium was observed in the fimbriae during early pregnancy. On the contrary, a significant increase in this parameter was observed in the isthmus during the first 3 days of pregnancy. A slight decrease in the height of the epithelium was observed in the infundibulum on day 4 of pregnancy, while in the ampullae it was significantly increased on days 1 and 3. The overall results indicate that during early pregnancy there is a selective modification in the histomorphological characteristics of the different regions of the rabbit oviduct.

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Peripheral Plasma Progesterone during Egg Transport in the Rabbit

Cited by 24 publications

References 5 publications

Steroid concentrations in rabbit oviducal fluid during oestrus and pseudopregnancy

Steroid concentrations in rabbit oviducal fluid during oestrus and pseudopregnancy

Platelet-activating factor in the rabbit uterus during early pregnancy

Histomorphological Changes in the Oviduct Epithelium of the Rabbit During Early Pregnancy

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