Evolution.
cow.
No, the USDA grades the cow as a whole.
a cow!
a cow
Yes. A barren cow (one that is open, or not pregnant) is able to come into heat or estrus.
http://ask.metafilter.com/27259/How-much-meat-is-there-on-a-cow
The etymology of cow is believed to originate from the Old English word, cu.
No, the cow will not go into estrus after she becomes pregnant.
Energy for the cow initially comes from the plants she eats and digests.
NO.
The cow.
Cow's.