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Poster De Conférence Année : 2016

The INRA feed tables and prediction equations for forage quality evaluation

Résumé

Accurate evaluation of nutritive value and voluntary intake potential of forages produced from grasslands and annual forage crops is a key feature of their efficient utilization in diets. INRA feed tables for forages are based on a database of more than 2000 in vivo measurements of digestibility and voluntary intake in sheep accumulated over several decades with a standard protocol. The tables cover a large variety of grassland and annual forage crop species (3 types of permanent pastures, 8 grass species, 6 forage cereals species, 5 forage legume species and 8 other species). A second database for in sacco nitrogen degradability (n=452) is used for estimation of protein value. Feed values in net energy, in digestible protein in the intestine and in fill unit are provided for fresh forages, as well as for conserved ones from statistical models accounting for the modification of feed value induced by ensiling and making hay. Prediction equations of feed value components established on this databases and from enzymatic digestibility measurements (n=375 for grasslands, n=290 for maize) allow calculations from laboratory analyses. A new version of forage feed tables will come out with updated net energy and digestible protein calculations taking into account the effect of feeding level on digestion and an improved estimation of organic matter fermented in the rumen (‘Systali’ project). It will include several novelties concerning fatty acid content of forages, estimation of energy loss in urine and as methane emission and estimation of starch degradability of maize silage. This will allow to evaluate forage quality also in relation to other dimensions than nutritive value, as impact on product quality, animal health and emissions in the environment. Finally the reference values provided by French tables show a good consistency with those provided in Netherland (CVB) and in Nordic countries (Norfor). This is promising for interoperability of feed tables and possible harmonization at European level.
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Dates et versions

hal-02744367 , version 1 (03-06-2020)

Identifiants

  • HAL Id : hal-02744367 , version 1
  • PRODINRA : 371594

Citer

René Baumont, Gaëlle Maxin, Pierre Noziere. The INRA feed tables and prediction equations for forage quality evaluation. 67. Annual Meeting of the European Association for Animal Production (EAAP), Aug 2016, Belfast, United Kingdom. 1 p., 2016. ⟨hal-02744367⟩
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