Chicken math space calculator6/8/2023 ![]() 86 = 79.5 percent TDN on a 90 percent dry-matter basis. Given a TDN value of 76 percent and a dry-matter content of 86 percent (14 percent moisture), what would be the TDN value of this feed on a 90 percent dry-matter basis? For example, if you use a 90-percent dry-matter basis, use the following calculation. Likewise, the crude-protein content or the TDN value also can be expressed on the basis of any given dry-matter level. To determine the total digestible nutrient (TDN) content of the above alfalfa on a dry-matter basis, follow the same procedure: 50 percent (TDN value on an as-fed basis) divided by 0.91 (dry-matter content of the feed) times 100 equals 54.9 percent TDN on a dry-matter basis. On a dry-matter basis, the crude protein value of the hay is calculated as follows: 17 / 0.91 (moisture content of 9 percent) times 100 equals 18.7 percent crude protein. If alfalfa hay is used as an example, the crude protein value is 17 percent on an as-fed basis. Use the following procedure to calculate composition on a dry-matter basis.Ĭrude protein value on an as-fed basis divided by dry-matter content of the feed times 100 equals the crude-protein content on a dry-matter basis. The two most common methods of expression are on an as-fed basis or dry-matter basis. The crude-protein value of a feed or the percentage of any other component (e.g., calcium or phosphorus) can be expressed several ways. Since only two components can be used in the Pearson square method, the ingredients are combined first as follows: 60% SBM x 45% crude protein (12 percent crude protein), take the following steps. For example, to prepare a 15 percent crude protein mixture that consists of a supplement of 60 percent soybean meal (45 percent crude protein) and 40 percent corn gluten meal (45 percent crude protein), and a grain mixture of 65 percent corn (9 percent crude protein) and 35 percent oats It is possible to mix more than two ingredients using the Pearson square. Check of the calculation: 88.57 lb corn x 10.0% CP Soybean meal represents (4.0 / 35.00) x 100 of the ration, or 11.43 percent. Use a 100-percent dry-matter basis for nutrient composition of ingredients and requirements and then convert to an as-fed basis after the formulation is calculated.Ĭorn represents (31.0 / 35.00) x 100 of the ration, or 88.57 percent. It also is very important to work on a uniform basis. Always double check calculations to make sure that you did not have a mathematical error. Always subtract on the diagonal within the square in order to determine parts. ![]() By summing those parts and dividing by the total, you can determine the percent of the ration that each ingredient should represent in order to provide a specific nutrient level. Subtract the nutrient value from the nutritional requirement on the diagonal and arrive at a numerical value entitled parts.Be concerned only with the numerical differences between the nutrient requirement and the ingredient nutrient values. Disregard any negative numbers that are generated on the right side of the square.If barley is used that has 12 percent crude protein and corn that has 10 percent crude protein, the square calculation method will not work because the 14 percent is outside the range of the values on the left side of the square. For example, the 14 percent crude protein requirement has to be intermediate between the soybean meal that has 45 percent crude protein or the corn that has 10 percent crude protein. The value in the middle of the square must be intermediate between the two values that are used on the left side of the square.In order to make the square work consistently, there are three very important considerations: It may be crude protein or TDN, amino acids, minerals or vitamins. This number represents the nutritional requirement of an animal for a specific nutrient. Probably one of the more important numbers is the number that appears in the middle of the square. In taking a close look at the square, several numbers are in and around the square. It is of greatest value when only two ingredients are to be mixed. The Pearson square or box method of balancing rations is a simple procedure that has been used for many years. Nutrient contents of ingredients and nutrient requirements must be expressed on the same basis (i.e., dry-matter or “as-fed”).In order for the square to work, follow specific directions for its use.The Pearson square ration formulation procedure is designed for simple rations.
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