Publication Date
1989
Location
Nice France
Description
In France, the 'net energy' system (INRA, 1978) permits calculation of the net energy (NE) of a feed in an analytical manner: NE = GE x Ed x ME/DE x k
where GE, DE and ME are respectively the gross, digestible and metabolisable energy contents, Ed the energy digestibility and k the net availability of ME for lactation, maintenance or fattening. The publication of Feed Tables (Demarquilly et al., 1978) and their revision (Andrieu et al., 1988) led to re&.earch on whether it is possible to predict the different terms of this formula, at least as far as the ME, from data (chemical composition, organic matter digestibility, intake) measured for forages. Prediction is possible with a good level of precision. It appears useful to present the equations obtained since, in many countries, the energy value of forages is calculated with the supposition that the energy content of the digestible organic matter (DOM) is constant and that the ratio ME/DE is also constant. This is not true and may lead to errors and sometimes considerable biais (Minson and Milford, 1966; Jeffery, 1967; Terry et al., 1973).
Citation
Andrieu, J and Demarquilly, C, "Prediction of the Digestible and Metabolizable Energy Content of Forages from their Chemical Composition and Organic Matter Digestibility" (1989). IGC Proceedings (1985-2023). 60.
(URL: https://uknowledge.uky.edu/igc/1989/session7/60)
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Prediction of the Digestible and Metabolizable Energy Content of Forages from their Chemical Composition and Organic Matter Digestibility
Nice France
In France, the 'net energy' system (INRA, 1978) permits calculation of the net energy (NE) of a feed in an analytical manner: NE = GE x Ed x ME/DE x k
where GE, DE and ME are respectively the gross, digestible and metabolisable energy contents, Ed the energy digestibility and k the net availability of ME for lactation, maintenance or fattening. The publication of Feed Tables (Demarquilly et al., 1978) and their revision (Andrieu et al., 1988) led to re&.earch on whether it is possible to predict the different terms of this formula, at least as far as the ME, from data (chemical composition, organic matter digestibility, intake) measured for forages. Prediction is possible with a good level of precision. It appears useful to present the equations obtained since, in many countries, the energy value of forages is calculated with the supposition that the energy content of the digestible organic matter (DOM) is constant and that the ratio ME/DE is also constant. This is not true and may lead to errors and sometimes considerable biais (Minson and Milford, 1966; Jeffery, 1967; Terry et al., 1973).
