HÆSTR uses the INRA energy system and calculates energy consumption based on “Net Energy.”
In Ireland, England, and Germany, horse feed content is specified as “Digestible Energy.” The unit used is MJ (Megajoule). In the USA, Megacalories (MCal) are used.
In Sweden and Finland, the energy content of horse feed is indicated as “Metabolizable Energy.” The unit used is MJ, and the numerical value for metabolizable energy is lower than when specifying the same feed content as “Digestible Energy.”
In Norway, Denmark, Iceland, the Netherlands, and France, the energy content of the feed is indicated as “Net Energy.” The unit used is Feed Unit for horses, called FEh in the Nordic region, EWpa in the Netherlands, and UFC in France.
HÆSTR uses UFC/kg as the energy unit for feeds.
To convert from MJ to UFC, you can use the following formula: UFC = MJ/9.414
Yes! Even if you’re not sure exactly how much grass or hay your horse eats, you can still tell if it’s missing any important vitamins or minerals.
It’s really helpful to get an analysis of the forage your pony/horse consumes.
When you plug the forage analysis results into HÆSTR’s nutrition calculator, you can figure out which vitamins and minerals your horse might need more of, and how much. If the forage provides enough of everything, then you can relax knowing your horse is getting all the nutrients it needs.
The app follows the norms set by the National Research Council for all vitamins and minerals.
Keep in mind that the nutrition calculator doesn’t prescribe an exact feeding plan for your horse. Instead, it guides you to stay within a recommended range (between minimum and maximum values). This helps minimize the risk of diseases and supports optimal performance and recovery.
Nutrients without specified limits (min or max) lack sufficient research to establish boundaries. For instance, researchers haven’t identified a clear connection between lack/excess of these nutrients and diseases.
Green: The current amount is okay.
Yellow: The current amount isn’t critical, but it’s higher than what’s recommended. This might be okay, but there’s some uncertainty. Try to get it below the maximum.
Red: The amount is not safe and needs correction because too much or too little of it can harm the horse.
Here’s how to add a feed that’s not in the app yet:
NB! The last tab/section, “Shared,” has feeds from other users. Be careful using them; they might contain errors. Always go through the details of the feed before using it in your calculations.
Are you missing a feed product? Please email us at email@example.com and let us know which feed you are missing.
The feed producers can specify the nutritional content of their products both as “per kg feed” and “per kg dry matter.”
“Per kg feed” indicates the amount of nutrients in 1 kg of feed, including its water content.
“Per kg dry matter” indicates the amount of nutrients in 1 kg of dry feed, without any water.
Most forages and concentrates contain a certain amount of water, so it is essential to consider how the nutritional content is presented on the feed product to ensure accuracy in calculations.
If the nutritional content is provided “per kg dry matter,” it will be expressed as, for example, “g/kg DM” or “mg/kg DM.”
If the nutritional content is specified “per kg feed,” it will be stated as “g/kg” or “mg/kg.”
Are you unsure which one to use? Take a picture of the nutritional content and email us at firstname.lastname@example.org. We are happy to help you.
Nutritional content on feed products can be displayed differently.
Energy is commonly shown as UFC/kg, Mcal/kg or MJ/kg, depending on where the feed is produced. In HÆSTR we use UFC/kg.
To calculate from MJ to UFC we use the following formula: UFC = MJ/9.414.
Keep in mind that the energy content must be shown as “Net Energy” for the calculation to be correct.
Vitamins and minerals are often shown as %, g, mg or IU. The most common calculation you must do is to calculate from % to grams or milligrams.
Example 1: Calcium 0.07% to g/kg
0.07\100 = 0.0007
0.0007 x 1000 g = 0.7 g/kg
Example 2: Iron 0.019% to mg/kg
0.019\100 = 0.00019
0.00019 x 1 000 000 mg = 190 mg/kg