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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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<html>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> |
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<title>Welcome to EvaPig®</title> |
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<link href="EvaPig.css" rel="stylesheet" type="text/css"> |
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<h1><a name="1000" id="1000">Welcome to EvaPig®</a></h1> |
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<h2><a name="1100" id="1100">Introduction</a></h2> |
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<p> EvaPig® is a calculator of energy, amino acid and phosphorus values of ingredients and diets for growing and adult pigs. It includes a database of chemical composition and nutritive values for about 100 reference ingredients, mostly derived from the <em><a href="http://www.evapig.com/documents" target="_blank">INRA-AFZ Tables of chemical composition and nutritive values</a></em> published in 2002-2004. </p> |
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<p> Users can create their own ingredients, either by copying and modifying the reference ingredients, or by creating new ingredients using only chemical composition data. EvaPig® uses equations and coefficients that calculate the nutritive values of the new ingredients. </p> |
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<p> EvaPig® can create and compare diets created from the reference or user-defined ingredients. It calculates the chemical and nutritional values of the diet by using those of the diet ingredients, with possible corrections for the physical form of the diet and phytase supplementation. It can also calculate the energy values of a diet from its chemical composition only. </p> |
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<p class="Légende"> Figure 1. EvaPig® main menu </p> |
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<img width="397" height="311" src="../images/Figure1.jpg"> |
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<h2><a name="1200" id="1200">Why use EvaPig®?</a></h2> |
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<p> Pig production faces numerous challenges. </p> |
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<p> Feeding accounts for more than half of the cost of pig production and heavily impacts upon the technical and economic results of the pig unit. As feed prices change very quickly, optimising diet composition becomes important. Because energy is the main component of the feed cost, it is highly beneficial to use an energy system that matches animal requirements as closely as possible to minimise the feed cost. </p> |
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<p> Likewise, the utilization of amino acid and phosphorus values close to animal requirements results in a more efficient use of these nutrients by the animals, lower feed costs and less excretion of nitrogen and phosphorus into the environment. </p> |
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<p> Another challenge to pig feeding is the large number of available ingredients. Reference books like the INRA-AFZ Tables provide values for the most common ingredients. However, the values are given for representative ingredients: the nutritional value of actual ingredients may differ significantly due to variation in chemical composition. Tables often include "correction" equations but using them to predict complex nutritional values is not straightforward. For new ingredients that have recently appeared on the feed market, tables offer little or no way to calculate their nutritional values. </p> |
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<p> Finally, animals, husbandry conditions and production targets are variable with subsequent variable nutritional requirements and quantities of feed. </p> |
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<p> EvaPig® provides several answers to these challenges. </p> |
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<ul>
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<li> It offers net energy values, ileal standardised amino acid digestibilities and phosphorus digestibilities for ingredients and diets. These are currently the most advanced nutritional systems for pigs. Nutritional values based on former concepts (digestible energy, digestible protein, total amino acids, etc.) are also available. </li> |
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<li> It makes it easy to calculate these values as accurately as possible. The energy values for a new ingredient can be derived from the reference ingredient that is biologically and/or botanically closest to it, using ingredient-specific equations that take into account the differences in composition between the reference ingredient and the new one. For ingredients that do not have a reference available, EvaPig® calculates nutritive values using the chemical values provided by the user and generic equations. </li> |
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<li> EvaPig® calculates energy values for two stages of pig production: the growing pig and the adult pig. </li> |
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</ul>
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<h2><a name="1300" id="1300">Reference tables</a></h2> |
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<p> Most of the reference values come from the INRA-AFZ Tables published in 2002-2004. These tables are based on the data collected by the French Feed Database of the AFZ since 1989. This database, that includes several hundreds of thousands of samples with chemical and nutritional values, was used to establish the reference ingredients, the representative chemical compositions and then nutritional values consistent with the proposed chemical composition, using equations derived from actual <em>in vivo </em>measurements. </p> |
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<p> The reference values included in EvaPig® may be slightly different from the original INRA-AFZ data. New ingredients have been (and will be) added while others were merged (fats, oils) since they had identical nutritional values for the pig. Also, some values have been updated to take into account data published since 2002. </p> |
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<p> Because pig production is constantly evolving, EvaPig® will be regularly updated to reflect these changes, using newly available <em>in vivo </em>data about ingredients, either from the published literature or sent by the researchers themselves. If you are willing to help in the development of EvaPig® and its reference database, particularly by sharing such data, please contact us through the website <a href="http://www.evapig.com/" target="_blank">www.evapig.com</a>. </p> |
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