The cud isn't another animal or being, it's simply a collection of digesta that is brought up from the rumen to the cow's mouth to be rechewed again. It's brought up by the contractions of the rumen and reticulum and the anti-peristaltic action of the esophagus, which brings a bolus of partly digested matter (i.e., cud) up into the cow's mouth.
Really, you should've asked "How does a cow know when she should regurgitate (or burp) up cud to rechew it again?" It might've made more sense that way.
Not very - cows eat a great deal of vegetation, which means their teeth have evolved to have deep grooves and ridges to increase surface area for grinding. This causes feed to be trapped within the grooves where it ferments and rots until it falls back out. In addition, cows are ruminants, which means they regurgitate (puke up) sections of food (cud) they already swallowed and re-chew them. Part of that cud will be the bacteria and protozoa that live in the cow's stomach.
Oh honey, chickens don't have cud to eat in the first place. Cud is regurgitated food that some animals chew again for better digestion, like cows. Chickens are more into pecking at grains and bugs, not chewing the same food twice. So, nope, chickens don't eat cud, they have better things to do with their time.
Cows only lay down when they are chewing their cud and resting after eating their fill. They don't lay down for any other reason, even when a storm or rain-shower is coming or happens. See the related question below for more.
This is called lying down, cattle do not sit down as their bodies are not built to sit. They lie down as they are resting, cattle will only chew their cud when they are relaxed. They will also digest standing up as well.
Like cows chewing the cud, rabbits eat their cecotropes in order to re-ingest their food and get the full nutritional benefit out of it.
Cud. Cows regergitate grass and it is call cud. Hence cows chew their cud.
chewing cud is mostly done by cows, goat, sheep etc. this takes place in RUMEN . 1st it eat's the grass , after sometime it sit's comfortably , the rumen helps the cow to make the cud come back in it's mouth then it will chew it , this process ; the cow will do it for a long time.
When cattleappear to be chewing they are doing exactly that, although I think you are referring to when cattle are chewing their "cud". Cattle regurgitate a small portion of food, known as their cud, and chew on it.
Partially digested forage that was in the rumen is moved into the reticulum from the contractions of the rumen. The esophagus "transports" the bolus of cud up fromt the reticulo-rumen to the mouth to be chewed.
Nothing. Cows usually don't "lose" their cud anyway.
partly digested food that cows and other ruminants return to the mouth, after it has passed into the first stomach, to chew again as an aid to digestion
They can regurgitate their food "cud" like cows, but they do this voluntarily so it is not considered vomiting. Their cud usually does not leave their mouth, it is just something for them to gnaw on. Goats can vomit. Usually when they do, they are vomiting their cud. This is sometimes referred to as "slinging their cud." If this is the case, a vet should be contacted to determine root cause.
Let it relax. The cow won't chew its cud unless it feels unthreatened and comfortable.
The times you see them chewing are when they are chewing their cud.
Yes, to be rechewed as cud.
They have the same four-chambered stomach that cows have and are capable of chewing cud just like cows do.
Deer, Cows, Sheep. All animals that chew the cud.