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This is called facultative parthenogenesis (other terms are cyclical parthenogenesis, heterogamy [14] [15] or heterogony [16] [17]). The switch between sexuality and parthenogenesis in such species may be triggered by the season ( aphid , some gall wasps ), or by a lack of males or by conditions that favour rapid population growth ( rotifers ...
Veterinary obstetrics are the obstetrical methods used in veterinary medicine, which are quite different from those of human medicine. Veterinary obstetrics is a branch of veterinary medicine that deals with medical and surgical care together with manipulations of the female animals in breeding , gestation , labor , puerperium (postpartum ...
The embryo during this process is called a gastrula. The germ layers are referred to as the ectoderm, mesoderm and endoderm. In diploblastic animals only the ectoderm and the endoderm are present. [8] * Among different animals, different combinations of the following processes occur to place the cells in the interior of the embryo:
The more developed form of viviparity is called placental viviparity; mammals are the best example, but it has also evolved independently in other animals, such as in scorpions, some sharks, and in velvet worms. [16] [17] [18] Viviparous offspring live independently and require an external food supply from birth.
In these large animals, the birth process is similar to that of a human, though in most the offspring is precocial. This means that it is born in a more advanced state than a human baby and is able to stand, walk and run (or swim in the case of an aquatic mammal) shortly after birth.
The baby's father or other support person may also choose to hold the baby SSC until the mother recovers from the anaesthetic. [ 72 ] The WHO suggests that any initial observations of the infant can be done while the infant remains close to the mother, saying that even a brief separation before the baby has had its first feed can disturb the ...
Lemos called an ambulance, but the first responders couldn’t resuscitate the baby. Hours went by as they waited for the coroner. Nosek was still bleeding a lot, too much, she thought.
If, after birth, the complete amniotic sac or big parts of the membrane remain coating the newborn, this is called a caul. When seen in the light, the amniotic sac is shiny and very smooth, but tough. Once the baby is pushed out of the mother's uterus, the umbilical cord, placenta, and amniotic sac are pushed out in the afterbirth.