M3.10: Cereal Grain Energy Sources: ANSC 100 Summer 2018 (WC).pdf

Tdn is expressed as a percent so a feed with a tdn of

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a crude but common way to express energy density. TDN is expressed as a percent. So a feed with a TDN of 80 would have more energy than a feed with a TDN of 60. The bottom part of the handout compares the nutritional replacement value of other cereal grains to shelled corn. Note that sorghum and wheat are relatively close to corn for most species. However, barley and oats are considerable lower because of additional fiber in these grains. Since corn is the #1 energy source for livestock diets, let’s spend a little more time on it. The corn plant can be divided into 5 distinct components. All have nutritive value for animals, but they aren’t all created equal. Part of the corn plant % of Dry matter % TDN of the part Corn grain 50 90
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6/10/18, 2)27 PM M3.10: Cereal Grain Energy Sources: ANSC 100 Summer 2018 (WC) Page 2 of 4 Cob 8 50 Husk 8 62 Stalk 18 55 Leaves 16 61 Total 100 Note that the grain portion of the corn plant makes up half the dry matter of the plant and is easily the highest energy component. Thus for high energy diets, corn grain is an excellent choice. Because the corn plant is so versatile, several different feeds can be harvested from it using specialized equipment. Shelled corn (corn grain only) can be harvested with a combine. Here’s a really cool video about combines and combining corn. If harvested “dry”, the dry matter content should be at least than 85%.
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  • Spring '17
  • Robert mikesell
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