This is an exerpt from an article about dairy cattle (link follows) but is interesting in the feed requirements for different weights of cows:
The group of 1,200 pound mature weight cows will consume 24 pounds of dry matter per day; therefore; 4.4 tons of dry matter annually. That calculates to a cost of $308 dollars per cow annually for forage costs. In contrast, a herd of cows with a 1,400 pound mature weight would eat 26.7 pounds of dry matter daily or would eat 4.9 tons annually and the forage costs calculates to $343 annually. Using the same process, the herd of 1,000 pound mature weight cow would eat 3.9 tons annually and forage costs would be $273 annually.
http://www.dairyherdnetwork.com/NLA_Mon ... id=Archive
The group of 1,200 pound mature weight cows will consume 24 pounds of dry matter per day; therefore; 4.4 tons of dry matter annually. That calculates to a cost of $308 dollars per cow annually for forage costs. In contrast, a herd of cows with a 1,400 pound mature weight would eat 26.7 pounds of dry matter daily or would eat 4.9 tons annually and the forage costs calculates to $343 annually. Using the same process, the herd of 1,000 pound mature weight cow would eat 3.9 tons annually and forage costs would be $273 annually.
http://www.dairyherdnetwork.com/NLA_Mon ... id=Archive