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The feeding value of wheat for swine can vary by over 30% between samples. Digestible energy and amino acids make up the greatest part of feed value. Up to now it has been difficult and costly to get reliable analyses for these nutrient components. Some of the procedures also take a long time to complete and by the time the results become available the wheat is already fed. Now there is a quick method of accurately estimating digestible energy and total amino acids from routine laboratory analyses. If you have lab analyses for moisture, protein and acid detergent fibre (ADF) or neutral detergent fibre (NDF), you can use this computer program to accurately estimate digestible energy and total amino acids in a wheat sample. When this information is used in feed formulation it will help you to use your wheat more efficiently in feeding pigs.
This computer program was made possible through the research work done by Prairie Swine Center Inc. at Saskatoon and by Alberta Agriculture, Food and Rural Development at Edmonton. The regression equation for digestible energy is based on digestibility studies conducted with 16 samples of specially selected wheat at the Prairie Swine Center Inc in 1999. They showed a direct relationship between fibre and digestible energy for swine. The regression equations for amino acids were developed from analyses of wheat samples specially selected from several thousand samples collected over many years from all over Alberta. Amino acid analyses were conducted at AAFRD Soils and Animal Nutrition Lab in Edmonton
On this page, enter the moisture, fibre (ADF or NDF), and protein contents of your wheat sample. ADF, NDF and protein are entered on a "dry matter" basis. The calculator automatically calculates digestible energy for swine and the percentages of 18 amino acids in the sample, and gives the results on a "sample" basis. Click on the "calculate " button and the results will be displayed on the next page.
To change protein from a "sample" basis to "dry matter" basis use the following formula:
Protein (dry matter) = (100 / 100 - moisture % ) x protein or
Protein (dry matter) = (100 / Dry matter %) x protein
To change ADF or NDF from "sample" to "dry matter" basis, follow the same procedure as for protein.
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