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Via Daily Kos.  From Physorg.com:

Milk goes green: Cows that receive recombinant Bovine Somatotropin (rbST) make more milk, all the while easing natural resource pressure and substantially reducing environmental impact, according to a Cornell University study to be published in the Proceedings of the National Academy of Sciences (June 30, 2008.)

[snip]

This research found that, compared to a non-supplemented population, giving rbST to one million cows would enable the same amount of milk to be produced using 157,000 fewer cows. The nutrient savings would be 491,000 metric tons of corn, 158,000 metric tons of soybeans, and total feedstuffs would be reduced by 2,300,000 metric tons. Producers could reduce cropland use by 219,000 hectares and reduce 2.3 million tons of soil erosion annually.

Hmmm.  As a good professor taught me, always check the assumptions.  Luckily OrangeClouds115 did so already, and put it very succinctly:

Why It’s a Load of Bull: Their entire argument assumes that you need to feed cows corn. You don’t. You actually shouldn’t. Cows evolved to eat GRASS. They evolved to graze. Grazing requires very little resources and energy. Here’s why:

First, grass is a perennial. You don’t need to plant it every year like you do with corn and soy. You plant it once, it grows, the cow eats it, it grows back. Planting stuff takes energy. Less planting = less energy.

Second of all, when cows graze, they harvest their own food. Harvesting food requires energy. You must harvest corn. You also have to process it and transport it before the cows can eat it. That takes energy too.

Click here for the rest.

Geez, I wonder who funded this study.  I don’t imagine that is public knowledge.