Embryo development and placentome formation during early pregnancy in red deer
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Published:1997
Issue:7
Volume:9
Page:723
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ISSN:1031-3613
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Container-title:Reproduction, Fertility and Development
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language:en
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Short-container-title:Reprod. Fertil. Dev.
Author:
McMahon C. D.,Fisher M. W.,Mockett B. G.,Littlejohn R. P.
Abstract
Early embryo development and placentome formation were assessed in red deer
between Days 27 and 55 of gestation. Uteri were collected from 12 pregnant
hinds in which mating was observed following a synchronized oestrus, and the
tissues retained for measurements and histological processing for light
microscopy. Twelve embryos were recovered with mean embryo weights increasing
from 0·02 ± 0·01 g at Day 27 to 7·56 ±
1·39 g at Day 55 of gestation. Similarly, crown-rump lengths increased
from 5·7 ± 0·7 mm to 55·3 ± 5·9 mm
over this period. The trophoblast had extended throughout both uterine horns
and gastrulation was completed by Day 27. Limb buds were apparent by Day 34,
and by Day 48 the phalanges had separated into hooves and dew claws. Plaques
were evident on the trophoblast at Day 34 and, by Day 41, placentomes had
formed adjacent to the embryo. These placentomes grew in size as pregnancy
advanced; by Day 55 most caruncles had formed placentomes. It is therefore
conrmed that placentome formation occurs at about the sixth week of gestation.
These results indicate that embryo growth and placentome formation in red deer
are generally typical of that observed in other
ruminants.Extra keyword: caruncle.
Publisher
CSIRO Publishing
Subject
Developmental Biology,Endocrinology,Genetics,Molecular Biology,Animal Science and Zoology,Reproductive Medicine,Biotechnology
Cited by
10 articles.
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