Mammalian diversity: gametes, embryos and reproduction
Abstract
The class Mammalia is composed of approximately 4800 extant species. These mammalian species are divided into three subclasses that include the monotremes, marsupials and eutherians. Monotremes are remarkable because these mammals are born from eggs laid outside of the mother’s body. Marsupial mammals have relatively short gestation periods and give birth to highly altricial young that continue a significant amount of ‘fetal’ development after birth, supported by a highly sophisticated lactation. Less than 10% of mammalian species are monotremes or marsupials, so the great majority of mammals are grouped into the subclass Eutheria, including mouse and human. Mammals exhibit great variety in morphology, physiology and reproduction. In the present article, we highlight some of this remarkable diversity relative to the mouse, one of the most widely used mammalian model organisms, and human. This diversity creates challenges and opportunities for gamete and embryo collection, culture and transfer technologies.
Keywords
assisted reproduction
research
Scientific
science
journal
International
art
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Genetics
cell biology
pregnancy
Fertility
csiro publishing
educational
journals
australian
cloning
australia
fertilization
lactation
andrology
reproductive technologies
transgenesis
gametogenesis
spermatogenesis
spermatology
oogenesis
embryo
embryogenesis
folliculogenesis
embryo implantation
fetal physiology
foetal physiology
fertilisation
early embryonic development
embryonic development
embryo development
ivf
ivp
ivm
embryo culture
cryopreservation
endocrinology
maternal physiology
reproductive immunology
reproductive biology
contraception
stem cell biology
animal production
theriogenology
csiro
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267007
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