The publication of this model in his book De revolutionibus orbium coelestium (On the Revolutions of the Celestial Spheres) just before his death in 1543 was a major event in the history of science, triggering the Copernican Revolution and making an important contribution to the Scientific Revolution.
World market prices for dairy products The average world market price of butter in 1981-2006 was US$1 580/ton, fluctuating between US$1 000/ton and US$2 000/ton. It shot up to US$2 886/ton in 2007 and, in the first six months of 2008, increased further to US$4 021/ton.
In calculating the winter feed costs, Hoppe figured a 1400-pound cow will either eat or waste 40 pounds of feed daily. Using a hay price of $65 per ton and figuring 180 days on feed with the winter ration that translates into a feed charge of $1.40 per day or $252 for six months.f a producer would like to realize a profit of $200 per head each year that would be an additional cost of $940 over the life of the cow, meaning that the value to pay for a bred heifer would be $1642.03. And that figure, Hoppe noted, is pretty close to what bred heifers are selling for at the current time.