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Superfetation (also spelled superfoetation – see fetus) is the simultaneous occurrence of more than one stage of developing offspring in the same animal. [1] [2] [3]In mammals, it manifests as the formation of an embryo from a subsequent menstrual cycle, while another embryo or fetus is already present in the uterus.
[20] [21] [22] GonaCon has been studied in male and female dogs and cats but does not provide long-acting suppression of fertility in these species. In dogs in particular, injection site reactions preclude use of the EPA approved formulation. [23] [24] Zona pellucida vaccines are targeted at females and do not suppress fertility in dogs or cats ...
In 2019, a Chinese woman was reported to have two babies from different fathers, one of whom was her husband and the other was a man having a secret affair with her during the same time. [12] In 2022, a 19-year-old Brazilian from Mineiros gave birth to twins from two different fathers with whom she had sex on the same day. [13]
A U.K. woman who was told she would never have children because of a rare condition recently gave birth to twins. When Hayley Haynes was 19, she went to the doctor because she hadn't gotten her ...
Neutering increases life expectancy in cats: one study found castrated male cats live twice as long as intact males, while spayed female cats live 39% longer than intact females. [39] Non-neutered cats in the U.S. are three times more likely to require treatment for an animal bite.
The average time to birth has been estimated to be 268 days (38 weeks and two days) from ovulation, with a standard deviation of 10 days or coefficient of variation of 3.7%. [32] Fertilization age is sometimes used postnatally (after birth) as well to estimate various risk factors.
Most mammals are viviparous, giving birth to live young. [1] However, the five species of monotreme, the platypuses and the echidnas, lay eggs. The monotremes have a sex determination system different from that of most other mammals. [2] In particular, the sex chromosomes of a platypus are more like those of a chicken than those of a therian ...
The first time Hannah Levine (who did not want to use her real name) tried having sex after giving birth, “the pain was immediate,” she says. Levine was taken by surprise. “No one warned me ...