Well it certainly isn't not uncommon for cows to do so. But there is risk that the cow may choke on it, and thus it is often best to let predators like coyotes, foxes or your dogs to clean it up instead.
It doesn't.
There will be reddish afterbirth hanging from the vulva, and you may see a really small calf on the ground nearby.
Then the predators like coyotes and foxes will eat it. This happens quite often in the wild, and there's nothing wrong with it.
Medicine won't help so much as an injectible hormone will, such as oxytocin. This hormone, produced by females in order to let down milk, will aid in encouraging a cow to expel the afterbirth if it is being retained longer than it should. It would be best to talk to your local large animal veterinarian about this beforehand, however.
the plastic bag will get get stuck in its oesophagus and if its large enough to choke the cow it will leave the planet.
Horses may eat their afterbirth.
The placenta that is expelled AFTER the BIRTH of a child, hence the name....afterbirth.
NO!!!! You leave it alone, let the cow clean it out herself. If you go in there and muck around you could increase the chance of her getting a bad uterine infection which could render her infertile or kill her if you don't treat her.
the placenta is called an afterbirth after the baby is born
afterbirth
their afterbirth!