As sampled vs. Dry matter results | Equ-analytical (2024)

Analytical results are typically reported on both aas takenIndrug matterbase. Both can be used for ration balancing and it is important to understand the difference between them and how to use them most effectively. Consistency is important: when developing a ration or comparing different feeds, results should be compared on the same basis. Failure to do so will lead to misinterpretations, incorrect wording and/or unfair comparisons.

Definitions

Moisture %– the percentage of water in the sample.

drug matter %– everything in the sample except water, including protein, fiber, fat, minerals, etc. Find by subtracting the moisture percentage from 100.

As a test basis– nutritional results for a sample in its natural state, including the water. Also known asas fedofas received. Guarantees for animal feed brands are usually reported on a sample basis.

Solids base– nutrient results for a sample from which the water (moisture) has been removed. Water has a diluting effect on the results. The reported results with water removed allow direct comparison of nutrients between different forages and often simplify the process of ration balancing.

Conversions

Because sampled results can be easily converted to solids-based results and vice versa, using the following formulas.

As a sample basis for dry matter basis

Drug base = As monster base / (DM% / 100)d

Example:

A pasture sample with a DM% of 25 and a crude protein percentage of 4.0. This is how you find the percentage of crude protein based on the dry matter:

Crude protein %, DM basis = 4.0 / (25 / 100) = 16.0%

Solid substance base for use as a sample base

As monster base = drug base x (DM% / 100)

Example:

A hay sample with a DM% of 90 and a dry matter basis crude protein% of 12.0. This is how you can find the percentage of crude protein on a sample basis:

Crude protein % as tested = 12.0 x (90/100) = 10.8%

On a sampled basis, the hay appears to have better protein content. When the diluting effect of water is removed, the dry matter basis results show that the nutrient-rich dry matter on grassland is superior to hay.

User

As test results

Feed assurance results are typically reported as samples on the feed label or on the back of the bag. If a diet consists mainly of dry food (i.e. hay, grain, oats), the results collected can be used to balance the ration. These feeds will all contain an average of approximately 90% dry matter (ranging from 88 – 92%). Because the dry matter is consistent across all feed materials in the ration, the results obtained can be used.

Drug results

• Ration development – ​​Dry matter results should be used when dry matter levels vary widely between forages in a diet. For example, hay and grain are typically 90% dry matter (10% water), while grass is 20% dry matter (80% water). Eliminating the impact of water on results simplifies the ration development process.
• Intake – Animals eat food to meet their daily dry matter requirements. Keep in mind that food can be divided into two basic parts: 1) water and 2) dry matter or something that is not water. It is the dry matter that contains all the nutrients (proteins, carbohydrates, fats, etc.) that animals eat to meet their dry matter needs. This also means that animals must consume more wetter feed to meet their daily dry matter needs. For example, an 1,100-pound horse will consume approximately 20 pounds of dry matter per day. The actual amount of feed consumed can be determined by dividing the kilograms of dry matter consumed by the percentage of dry matter in the feed. If this horse consumed only 90% dry matter hay, it would need to eat 20/(90/100) or 22.2 pounds of hay. If the only food were grass with 25% dry matter, it would have to eat 20/(25/100) or 80 pounds of grass. Compare the two:
  • 22.2 pounds. hay @ 90% dry matter = 2.2 lbs. water + 20 lbs. of dry matter.
  • 80 pounds. pasture @ 25% dry matter = 60 lbs. water + 20 lbs. of dry matter.
  • To consume the same pounds of nutritious dry matter (20 lbs.), horses must eat larger amounts of grass.
• Prediction of feed intake – Total dry matter intake (DMI) is based on body weight, growth stage, reproductive status and activity level. DMI is expressed as a percentage of body weight. The table below shows some examples.

Once DMI intake in pounds has been determined, you can estimate the percentage of forage or grain that is best suited to meet the nutritional needs of a particular horse. You can also estimate how many pounds of feed are consumed if the amount is unknown (see below).

• Comparison of forages – Dry matter based results should be used to compare forages, especially if they differ in dry matter content. Nutrients (proteins, carbohydrates, etc.) are only in the dry matter. Water removal and its dilution effect is essential to make valid comparisons between feeds. Take a look at the hay and pasture samples below: On a sample basis, the hay looks better in terms of protein. When the diluting effect of water is removed, the dry matter basis results show that the nutrient-rich dry matter on grassland is superior to hay.

• Estimation of individual feed intake – It is often difficult to measure the intake of an individual feed. Grazing is a good example. You cannot weigh the amount consumed as you can with other feeds (hay, grain) because you have no control over how much is offered or consumed. However, if one weighs the amount of hay and grain fed and predicts total dry matter intake as described above, the amount of pasture consumed can be estimated.

Example:

An 1,100-pound horse will consume a total of 20 pounds of dry matter and is fed 5 pounds of hay and 5 pounds of grain. The hay and grain are both 90% dry matter and the pasture 25% dry matter. With this information you can estimate the amount of grass consumed.

1. Calculate the kilograms of dry matter consumed from hay and grain:

• 5 lbs of hay x 90/100 DM = 4.5 lbs of dry matter from hay
• 5 lbs of grain x 90/100 DM = 4.5 lbs of grain dry matter
• 9 pounds total DMI from hay and grain

2. Estimate how many kilos of dry grass matter have been consumed:

• 20 lbs predicted total DMI - 9 lbs total DMI from hay and grain = 11 lbs estimated grass DMI

3. Estimate how many kilos of pasture were consumed, which fed:

• 11 lbs lawn DMI / (25/100 DM) = 44 lbs grass, as fed