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Embryonic diapause [a] (delayed implantation in mammals) is a reproductive strategy used by a number of animal species across different biological classes.In more than 130 types of mammals where this takes place, the process occurs at the blastocyst stage of embryonic development, [1] and is characterized by a dramatic reduction or complete cessation of mitotic activity, arresting most often ...
Depending on the animal species, the process can occur within the body of the female in internal fertilization, or outside in the case of external fertilization. The fertilized egg cell is known as the zygote. [2] [5] To prevent more than one sperm fertilizing the egg , fast block and slow block to polyspermy are used. Fast block, the membrane ...
Believing the condition may be dangerous, as a person may have become infected with rabies after a bite, and seeking witch doctor treatment can delay medical treatment. [1] Most sufferers are referred to psychiatric services , but in some instances patients fail to take anti-rabies medication before symptom onset, thinking that they are ...
These genes affect embryogenesis and can confer tameness, smaller jaws, floppy ears, and diminished craniofacial development, which distinguish domesticated dogs from wolves and are considered to reflect domestication syndrome. The study concluded that during early dog domestication, the initial selection was for behavior.
Canine sperm can live for 10 to 11 days in the fallopian tubes so if a female is bred 10 days before the oocytes (ovum) can be fertilized, she will appear to have a gestation length of 70 days. If she is bred on the day the oocytes can be fertilized, her gestation length will appear to be 60 days long.
Over half of dog bite injuries occur at home with familiar dogs and having a dog in the household is linked to a higher likelihood of being bitten than not having a dog. As the number of dogs in the home increases, so does the likelihood of being bitten. [33] Dog bites may transmit zoonotic infections, which may also result in illness or death.
Hammack, whose daughter is now 3, says since those early days when she was criticized for piercing her baby's ears, she's learned only a parent knows what will work best for their child.
Decidualization is required in some mammalian species where embryo implantation and trophoblast cell invasion of the endometrium occurs, also known as hemochorial placentation. This allows maternal blood to come into direct contact with the fetal chorion , a membrane between the fetal and maternal tissues, and allows for nutrient and gas exchange.