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Gestation, called pregnancy in humans, is the period of time during which the fetus develops, dividing via mitosis inside the female. During this time, the fetus receives all of its nutrition and oxygenated blood from the female, filtered through the placenta, which is attached to the fetus' abdomen via an umbilical cord.
List of mammalian gestation durations. This is a collection of lists of mammal gestation period estimated by experts in their fields. The mammals included are only viviparous (marsupials and placentals) as some mammals, which are monotremes (including platypuses and echidnas) lay their eggs. A marsupial has a short gestation period, typically ...
Pregnancy (mammals) A pregnant lioness. In mammals, pregnancy is the period of reproduction during which a female carries one or more live offspring from implantation in the uterus through gestation. It begins when a fertilized zygote implants in the female's uterus, and ends once it leaves the uterus.
Humans, unlike most other species, have concealed ovulation, a lack of obvious external signs to signal estral receptivity at ovulation (i.e., the ability to become pregnant). Some species of animals with estrous cycles have unmistakable outward displays of receptivity, ranging from engorged and colorful genitals to behavioral changes like ...
Interspecific pregnancy (literally pregnancy between species, also called interspecies pregnancy or xenopregnancy) [1] is the pregnancy involving an embryo or fetus belonging to another species than the carrier. [1] Strictly, it excludes the situation where the fetus is a hybrid of the carrier and another species, thereby excluding the ...
Drawing of a fetus in utero. Gestation is the period of development during the carrying of an embryo, and later fetus, inside viviparous animals (the embryo develops within the parent). [1] It is typical for mammals, but also occurs for some non-mammals. Mammals during pregnancy can have one or more gestations at the same time, for example in a ...
“The most likely time to get pregnant is around the time of ovulation,” Frugoni says. This usually happens approximately 14 days before the next period, although this will differ from person ...
A man performing artificial insemination of a cow. A breeding mount with built-in artificial vagina used in semen collection from horses for use in artificial insemination. Artificial insemination is used for pets, livestock, endangered species, and animals in zoos or marine parks difficult to transport.