According to a Young Cattleman on an agriculture propaganda site:

"Corn is the predominant grain used because it is a great source of starch 
(carbohydrates) utilized for energy. Other grains used include oats, barley, 
sorghum, distillers (brewers) grains, and by-products of numerous grain and 
fiber milling processes.  These are referred to as the concentrate portion of 
the ration.

Corn or wheat silage is a very common feed ration ingredient to be used. It can 
account for the forage and concentrate portion of the diet. Silage is the 
entire plant (seed and stalk), harvested in an earlier stage with higher 
moisture, then stored in an anaerobic environment (without oxygen) where 
fermentation occurs and breaks down the plant cell walls."

That's for beef cattle, anyway. 

And even if there were soy, it's hardly natural for ruminant. 

Cheers,

frank

On October 30, 2015 3:10:27 PM EDT, "P.J. Alling" <[email protected]> 
wrote:

>Soybeans is a large part of animal feed, corn hardly has enough 
>nourishment.  One of the problems of the native American cultures was 
>lack of large domesticable  animals, and suitable easily domesticable 
>grasses.  No culture that had a choice would have chosen Corn, and the 
>only tractable large ruminant in the Americas was, well there wasn't
>one.

-- 

"Sharpness is a bourgeois concept." -- Henri Cartier-Bresson

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