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What is TDN?

Updated: 9/15/2023
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15y ago

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TDN is called Total Digestible Nutrients.

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15y ago
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Q: What is TDN?
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For horses Feeds high in fiber and low in TDN are called?

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Why is total digestible nutrients most closely associated with digestible energy?

Because that's where you get the energy from, is the nutrients that is in the feed, hence the TDN that is found in the feed which includes such nutrients as protein, carbohydrates, and fat.


What is TDN or total nutrients mean?

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How many Gibson es-330 tdn were made?

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What are some energy yielding feeds?

All feeds have some form of energy in them, measured in the form of TDN (total digestible nutrients), DE (digestible energy), ME (metabolizable energy), NE (net energy), etc. The only feeds that do not have any sort of energy in them are minerals--macro- and micro-minerals.


What is difference between forage and roughage?

Concentrates are foods that are high in digestibility, but low in fiber. (For example: hay, silage, etc.)Roughages are foods that are low in digestibility, but high in fiber. (For example: corn, oats, barley, etc.)


How is fat content in a feed bag expressed on the feed tag?

Generally, it is expressed as EE or Ether Extract. This is the crude fat content of a feedstuff. Fat is an energy source that has 2.25 times the energy density of carbohydrates. However, on the feed tag itself, fat content or lipid content is expressed, in addition to digestible fiber, protein content and carbohydrates, as NE or Net Energy. NE is only used for high to moderate concentrates such as grain or grain-mix diet formula. If you don't have a feed back of concentrate ration but instead forage pellets, then you will find the fat content expressed as, in conjunction with the other contents added above, as TDN or Total Digestible Nutrient. NE is a value only used for cattle. For horses and pigs, the feed tag should be reading as DE or Digestible Energy. All values mentioned (NE, DE and TDN) are expressed as MCal/lb or MCal/kg. See the related link below for more.


What is the megajuoles of energy of a silage?

The energy content of silage varies depending on what constitutes silage. Remember, silage is fermented chopped fodder that is often comprised of corn or barley, but sometimes also grass hay, and oats, wheat, rye, and triticale. Energy content also varies on when the fodder was cut for silage. For example, corn silage that was cut at a late-maturity stage will have less energy than corn silage cut when it was at early or mid-maturity.It is actually impossible to accurately predict or know what the energy content of silage is for all silage produced, and the energy content of a feedstuff like silage isn't measured in the same way that the energy (carbohydrate) content of a food item we would eat is. Energy is measured in Mcal/kg or Mcal/lb of DM (dry matter) or in percent (%) of DM, and as various values including Non Structural Carbohydrates, Net Energy, Metabolizable Energy, Digestible Energy, and Total Digestible Nutrients (TDN). As you can see in this paper, TDN and other energy values differ from one feed type to another.