Comparative interests and limits of metabolizable energy and net energy for evaluating poultry and pig feeds
| Autor: | Noblet, Jean |
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| Přispěvatelé: | Physiologie, Environnement et Génétique pour l'Animal et les Systèmes d'Elevage [Rennes] (PEGASE), Institut National de la Recherche Agronomique (INRA)-AGROCAMPUS OUEST, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), World's Poultry Science Association (WPSA). INT. |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | 20. European Symposium on Poultry Nutrition (ESPN) 20. European Symposium on Poultry Nutrition (ESPN), World's Poultry Science Association (WPSA). INT., Aug 2015, Prague, Czech Republic Proceedings of the 20th European Symposium on Poultry Nutrition (ESPN). 2015; 20. European Symposium on Poultry Nutrition (ESPN), Prague, CZE, 2015-08-24-2015-08-27, 48-56 |
| Popis: | International audience; The evaluation of the energy content of pig or poultry feeds has been most commonly based on their DE or ME contents. However, the closest estimate of the "true" energy value of a feed should be its NE content, which takes into account differences in metabolic utilization of ME of nutrients. This review considers some methodological aspects of NE determination. Experimental data in pigs indicate that the NE/ME ratio varies greatly with the chemical composition of diets and nutrient, with ratios for fat (90%) and starch (80%) that are higher than for protein and die-tary fibre (60%). This has marked consequences on the relative energy values of ingredients according to the en-ergy system that is used. The NE system is also better in predicting the performance of pigs. With regard to poultry, the ranking between nutrients for NE/ME is similar to what is observed in pigs but with smaller differences between nutrients. However, complementary data are required to propose a convincing and functional NE system for poultry. In any case, the accuracy of the NE value is highly dependent on the accuracy of DE or ME values or digestible nutrient contents that are used as predictors of NE values. Overall, there is an obvious advantage in using NE sys-tems for pigs while further investigations are required for implementing a reliable NE system for poultry. |
| Databáze: | OpenAIRE |
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