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Poster De Conférence Année : 2018

A new methodology to estimate protein feed value using the milk protein biological response

Résumé

New processes to increase the proportion of by-pass protein from feeds for ruminant are emerging (essential oils, natural tannins). However, the traditional methodologies used to predict nutritional value (degradation in vitro or in sacco) are not suitable with these new techniques that claim more systemic effects in rumen. The objective of this trial was to test the biological milk protein response to the supply of metabolizable protein as a new methodology for assessing the protein value of feed. This biological response is not linear because the efficiency of metabolizable protein (milk protein/metabolizable protein intake) decreases when the protein supply increases. We assumed a linear decrease of protein efficiency to be able to predict the protein value of a diet from the observed milk production with only two reference extreme diets of known feed value. Four isoenergetic treatments, defined by their protein supply, were applied in a Latin square design to 24 cows divided in 6 homogenous groups (based on potential production of cows and parity) over four 3-wk periods. The two extreme treatments contained either 3.4 kg DM of energetic concentrate (C++S0, 101 g PDIE/kg MS) or 3.4 kg DM of soybean meal (C0S++, 242 g PDIE/kg MS). Two intermediary diets with mixes of these two feeds (C++S+, 152 g PDIE/kg MS and C+S++, 199 g PDIE/kg MS) where used to assess their metabolizable protein from their milk protein responses. Increasing protein supply has a significant positive effect on milk protein yield (895 and 964 g protein.d-1 for C++S0 and C0S++ respectively). Estimation of the protein value of the two intermediate diets according to the milk protein response were 17 and 15 g PDIE.kg MS-1 higher for C++S+ and C+S++ respectively than the calculated one (i.e. an error of 11 and 7% respectively). This error could be partly explained by small differences in energy intake. In spite of this slight overestimation, milk protein response seems a relevant approach, independent of the protection process, to estimate the protein value of feed, especially for the new feed protections.
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Dates et versions

hal-01904402 , version 1 (24-10-2018)

Identifiants

  • HAL Id : hal-01904402 , version 1
  • PRODINRA : 450226

Citer

Florence Dufreneix, Jean-Louis Peyraud, Philippe Faverdin. A new methodology to estimate protein feed value using the milk protein biological response. 69. Annual Meeting of the European Federation of Animal Science (EAAP), Aug 2018, Dubrovnik, Croatia. Wageningen Academic Publishers, Annual Meeting of the European Association for Animal Production, 24, 2018, Annual Meeting of the European Association for Animal Production. ⟨hal-01904402⟩
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