Some Histochemical Observations on the Endometrium and the Yolk-sac Placenta of Erinaceus europea

Development ◽  
1957 ◽  
Vol 5 (2) ◽  
pp. 184-200
Author(s):  
B. Morris
Keyword(s):  
Breeding Season ◽  
Yolk Sac ◽  
Pregnant Females ◽  
Lactating Females ◽  
Reichert's Membrane ◽  
Yolk Sac Placenta

The placentation of Erinaceus europea has been described by Hubrecht (1889). An account of the development and structure of the avascular and vascular yolk-sac placentae which are formed in this species has been presented (Morris, 1953). Reichert's membrane is formed in the wall of the yolk-sac and it persists to term. A further study of the yolk-sac placentae, Reichert's membrane, the decidua and the endometrium of Erinaceus, involving the use of several histological and histochemical techniques, is reported herein. The material consisted of the uteri of three hibernating females obtained in January and February, and the uteri of seven non-pregnant females caught at the beginning of the breeding season in Nottinghamshire in May 1954. Twentyfour gravid uteri and twelve uteri from non-pregnant lactating females were obtained between May and September. At autopsy the uteri of the non-pregnant animals were removed and small portions were fixed in various fluids.

Breeding of a Captive Colony of Notomys fuscus Wood Jones (Rodentia : Muridae)

1980 ◽  
Vol 7 (3) ◽  
pp. 379 ◽  
Author(s):  
HJ Aslin ◽  
CHS Watts
Keyword(s):  
Breeding Season ◽  
Vaginal Bleeding ◽  
Post Partum ◽  
Reproductive Rate ◽  
Oestrous Cycle ◽  
Gestation Period ◽  
Pregnant Females ◽  
Delayed Implantation ◽  
Lactating Females

Reproductive data were obtained from a captive colony of N. fuscus over 10 years. Females had an oestrous cycle averaging 7.4 days, and a gestation period averaging 34.3 days. Only three possible instances of post-partum mating were recorded, but. some lactating females returned to oestrus 14-22 days after birth of their young. There was no evidence of delayed implantation due to lactation. Vaginal bleeding occurred in pregnant females 8-17 days before birth. Seventy-four litters were born, litter sizes ranging from one to five, average 2.7. No breeding season was evident. Both sexes were reproductively mature at 70 days old. Comparisons are made with other species of Notomys, and their generally low reproductive rate discussed.

Visualization of Antibody Transport in Rat Visceral Yolk-Sac Placenta

1982 ◽  
Vol 40 ◽  
pp. 246-247
Author(s):  
William P. Jollie
Keyword(s):  
Phosphate Buffer ◽  
Yolk Sac ◽  
Female Rats ◽  
Thin Sections ◽  
Visceral Yolk Sac ◽  
Antibody Complex ◽  
Cytochemical Reaction ◽  
Hind Foot ◽  
Antigen Antibody ◽  
Yolk Sac Placenta

A technique has been developed for visualizing antibody against horseradish peroxidase (HRP) in rat visceral yolk sac, the placental membrane across which passive immunity previously has been shown to be transferred from mother to young just prior to birth. Female rats were immunized by injecting both hind foot pads with 1 mg HRP emulsified in complete Freund's adjuvant. They were given a booster of 0.5mg HRP in 0.1 ml normal saline i.v. after one week, then bred and autopsied at selected stages of pregnancy, viz., 12, 1 7 and 22 days post coitum, receiving a second booster, injected as above, five days before autopsy. Yolk sacs were removed surgically and fixed immediately in 2% paraformaldehye, 1% glutaraldehye in 0.1 M phosphate buffer with 0.01% CaCl2 at pH 7.4, room temperature, for 3 hr, rinsed 3X in 0.1 M phosphate buffer plus 5% sucrose, then exposed to 1 mg HRP in 1 ml 0.1 M phosphate buffer at pH 7.4 for 1 hr. They were refixed in aldehydes, as above, for 1 5 min (to assure binding of antigen-antibody complex). Following buffer washes, the tissues were incubated in 3 mg diaminobenzidine tetrahydrochloride and 0.01% H2O2 in 0.05 M Tris-HCl buffer for 30 min. After brief buffer washes, they were postfixed in 2% OsO4. in phosphate buffer at pH 7.4, 4°C for 2 hr, dehydrated through a graded series of ethanols, and embedded in Durcupan. Thin sections were observed and photographed without contrast-enhancement with heavy metals. Cytochemical reaction product marked the site of HRP (i.e., antigen) which, in turn, was present only where it was bound with anti-HRP antibody.

Structure of the paraplacenta and the yolk sac placenta of the viviparous Australian sharpnose shark, Rhizoprionodon taylori

Placenta ◽  
2021 ◽  
Vol 108 ◽  
pp. 11-22
Author(s):  
Alice L. Buddle ◽  
James U. Van Dyke ◽  
Michael B. Thompson ◽  
Colin A. Simpfendorfer ◽  
Christopher R. Murphy ◽  
...  
Keyword(s):  
Yolk Sac ◽  
Yolk Sac Placenta

Biology of the Feral Cat, Felis Catus (L.), On Macquarie Island.

1985 ◽  
Vol 12 (3) ◽  
pp. 425 ◽  
Author(s):  
NP Brothers ◽  
IJ Skira ◽  
GR Copson
Keyword(s):  
Sex Ratio ◽  
Breeding Season ◽  
Felis Catus ◽  
Feral Cat ◽  
Feral Cats ◽  
Macquarie Island ◽  
Pregnant Females

246 feral cats were shot on Macquarie Island, Australia, between Dec. 1976 and Feb. 1981. The sex ratio ( males : females ) was 1:0.8. The percentages of animals with tabby, orange and black coats were 74, 26 and 2 resp. [sic]. Of the 64 orange cats, 56 were males . The breeding season was Oct.-Mar., with a peak in Nov.-Dec. The number of embryos in the 14 pregnant females averaged 4.7 (range = 1-9). The size of the 23 litters that were observed averaged 3 (range = 1-8). Kitten survival to 6 months of age was estimated to be <43%.

Uptake and transfer of amino acids in the artificially perfused guinea-pig yolk sac placenta

Placenta ◽  
1989 ◽  
Vol 10 (5) ◽  
pp. 474
Author(s):  
C. Schoch ◽  
H. Schröder ◽  
H.-P. Leichtweil
Keyword(s):  
Amino Acids ◽  
Guinea Pig ◽  
Yolk Sac ◽  
Yolk Sac Placenta

Isotopic ( δ 15 N ) relationship of pregnant females and their embryos: Comparing placental and yolk‐sac viviparous elasmobranchs

2020 ◽  
Author(s):  
Isis Baró‐Camarasa ◽  
Ana J. Marmolejo‐Rodríguez ◽  
Todd M. O'Hara ◽  
Fernando R. Elorriaga‐Verplancken ◽  
Abel Trejo‐Ramírez ◽  
...  
Keyword(s):  
Yolk Sac ◽  
Pregnant Females ◽  
Relationship Of

Reproduction of the Rabbit, Oryctolagus cunniculus (L.), on Macquarie Island, Subantarctic

1978 ◽  
Vol 5 (3) ◽  
pp. 317 ◽  
Author(s):  
IJ Skira
Keyword(s):  
Breeding Season ◽  
Annual Cycle ◽  
First Year ◽  
Corpora Lutea ◽  
Macquarie Island ◽  
Pregnant Females

The reproduction of rabbits on Macquarie I. was studied from December 1973 to February 1975. The breeding season extended from late August 1974 to mid-March 1975; both sexes showed an annual cycle in development and regression of the gonads. Between mid-October and mid-November 92% of females sampled were pregnant; during this period the maximum numbers of corpora lutea and embryos were 8.55 and 6.50 per female respectively. Few resorptions occurred although the number of pregnant females that resorbed increased as the breeding season progressed. Of all rabbit kittens produced in the 1974-75 breeding season, 64% were born by mid-December 1974. Female rabbits in their first year of breeding bore the greatest number of kittens; natality decreased as females aged.

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