This depends on the breed. Smaller breeds may only weigh around 70 to 80 lbs at 1 month of age; other breeds that are larger can weigh around 200 or 300 lbs at this age.
The answer to this question is totally dependent on what breed that this 15 month-old so-called "cow" is.
There is no such thing as a "bull cow." Either you are talking about a bull, or a "cow" which would be a weanling heifer. As such this all depends on the breed of that animal.
No
A Belgian Blue cow can weigh an average of around 1500 lbs.
The pectoral muscle on a cow will vary depending on the type of cow it is and how big it is. A cow's pectoral muscle can weigh a couple hundred pounds.
1/4 of a whole butchered cow
1000 lbs
about 16.6% of what it weighs on Earth
~1200lbs
Around 3 to 4 pounds, depending on the size of cow and what she's fed.
As Much As monkey poo with a moo moo cow in it
Average of 60 pounds