It is in a total mixed ration (TMR) and when limit-fed; it is also good since commercial dairy cows are selectively bred so that their energy requirements often exceed the best quality forage they can be fed. Corn must be supplied regularly as a supplement to meet such high energy needs from a lactating dairy cow. However, even the small amount of corn they are fed contribute to subacute acidosis simply because the cows eat a lot and they often pick through their ration to get at the good stuff: the best-tasting, most palatable stuff, which is often the grain portion of their TMR.
Generally, though, cows aren't meant to eat corn because they're not naturally suited to consume such grains on a regular basis. However, when you get dairy cows with really high energy needs and are not feed efficient when on pasture due to their genetics, corn is a necessary evil to use to meet their energy requirements.
It would most likely eat grass or grain.
A cow. Or, if you want to go into specifics, a dairy cow.
Dairy cows can produce over 65,000 lb of milk per year.
It gives more milk than what it would normally produce for its calf. That's what constitutes a cow for being a dairy cow.
The dairy cow.
Dairy
That all depends on the breed. Are you asking about a dairy cow or a beef cow, and what breed of dairy or beef cow?
Dairy cattle like Holsteins, Brown Swiss and Jerseys.
volume of good milk volume is the key.
you got it the other way round, the corn makes the cow
That depends on the type of cow. A dairy cow is able to feed four at one time, whereas a beef cow will be only able to feed one calf at a time--two if she's a really good producer or has a significant amount of dairy influence in her.
A dairy cow would die a matter of a few weeks before she even gets to the point where she is deemed "feral." I would see a beef cow becoming feral, yes, but not a dairy cow.