et distiller's grains and solubles ate about 5 percent more and gained about 5 percent more, so the feed efficiency was the same in comparison to those that did not receive it, Brown said.
"We found you will have to have one and a half percent added fat with the distiller's grains to achieve the feed efficiency similar to a steam-flaked corn diet with 3 percent fat added," he said.
The net energy value for gain of the distiller's grain based on animal performance was 80 percent of that used for steam-flaking corn, Brown said. Those numbers determine what the exchange is, or what the nutritive values are for competing ingredients,
Nutritionists and feedyard managers can factor in costs ? the price of distiller's grains, cottonseed meal, yellow grease, which all change over time ? to determine what is more economical, Cole said.
"Through the comparison of with or without distiller's grains, we have numbers of what actual performance ended up being with those exchanges," Brown said. "Individuals can use that information and apply economics to it to find the best combination of ration ingredients at a given point of time."
Another consideration in feeding a wet distiller's grain is the ration has more total weight to be delivered to the bunk, he said.
"We measured diet density on six occasions to determine if you have to haul more or fewer loads to feed the cattle," Brown said. "That would certainly factor into decisions at a commercial facility."
The distiller's grains rations were wetter and more dense than those without distiller's grains, he said. The data suggests a feedlot would need to deliver 10 percent more feed if feed trucks are filled to the same volume or 23 percent more if feed trucks are filled to the same total weight.
The researchers also are looking at potential effects on ammonia emissions and other environmental and animal health concerns, Cole said.
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