A new nordic structure evaluation system for diets fed to dairy cows

Peder Nørgaard; E. Nadeau; H. Volden; Å. Randby; O. Aaes; M. Mehlqvist

A new nordic structure evaluation system for diets fed to dairy cows

Peder Nørgaard, E. Nadeau, H. Volden, Å. Randby, O. Aaes, M. Mehlqvist

Abstract

The objective of the Norfor structure system was to establish a model for prediction of eating- (EI), ruminating- (RI) and total chewing index (CI) for feeds and total rations fed to dairy cows. The model was predicted from a Meta analysis of more than 100 published experiments including results on eating, ruminating and total chewing time by cattle fed mainly high forage diets. The EI is proportional with the neutral detergent fibre (NDF) content and a particle size factor (Size_E) of the feed. The RI is proportional with the NDF content, a particle size factor (Size_R) and a hardness factor of the feed. The CI is estimated as the sum of the EI and RI. The Size_E and Size_R values are estimated from exponential functions of the most frequent particle length. The hardness factor is estimated as a linear function of the proportion of indigestible NDF in NDF. A minimum dietary CI value of 32 minutes per kg of total DMI is considered to ensure a sufficient intake of physically effective fibre in order to ensure good ruminal fibre digestion and to prevent a low rumen pH, digestive disorders and a low milk fat content in high-yielding dairy cows.

Original language	English
Title of host publication	Biodiversity and animal feed : future challenges for grassland production
Editors	A. Hopkins, T. Gustafsson, J. Bertilsson, G. Dalin, N. Nilsdotter-Linde, E. Spörndly
Number of pages	3
Publisher	Sveriges Lantbruksuniversitet (SLU)
Publication date	2008
Pages	762-764
Publication status	Published - 2008
Event	EGF General Meeting - Uppsala, Sweden Duration: 9 Jun 2008 → 11 Jun 2008 Conference number: 22

Conference

Conference	EGF General Meeting
Number	22
Country/Territory	Sweden
City	Uppsala
Period	09/06/2008 → 11/06/2008

Series	Grassland Science in Europe
Volume	13

Cite this

Nørgaard, P., Nadeau, E., Volden, H., Randby, Å., Aaes, O., & Mehlqvist, M. (2008). A new nordic structure evaluation system for diets fed to dairy cows. In A. Hopkins, T. Gustafsson, J. Bertilsson, G. Dalin, N. Nilsdotter-Linde, & E. Spörndly (Eds.), Biodiversity and animal feed: future challenges for grassland production (pp. 762-764). Sveriges Lantbruksuniversitet (SLU). Grassland Science in Europe Vol. 13

A new nordic structure evaluation system for diets fed to dairy cows. / Nørgaard, Peder; Nadeau, E.; Volden, H. et al.

Biodiversity and animal feed: future challenges for grassland production. ed. / A. Hopkins; T. Gustafsson; J. Bertilsson; G. Dalin; N. Nilsdotter-Linde; E. Spörndly. Sveriges Lantbruksuniversitet (SLU), 2008. p. 762-764 (Grassland Science in Europe, Vol. 13).

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

Nørgaard, P, Nadeau, E, Volden, H, Randby, Å, Aaes, O & Mehlqvist, M 2008, A new nordic structure evaluation system for diets fed to dairy cows. in A Hopkins, T Gustafsson, J Bertilsson, G Dalin, N Nilsdotter-Linde & E Spörndly (eds), Biodiversity and animal feed: future challenges for grassland production. Sveriges Lantbruksuniversitet (SLU), Grassland Science in Europe, vol. 13, pp. 762-764, EGF General Meeting, Uppsala, Sweden, 09/06/2008.

Nørgaard P, Nadeau E, Volden H, Randby Å, Aaes O, Mehlqvist M. A new nordic structure evaluation system for diets fed to dairy cows. In Hopkins A, Gustafsson T, Bertilsson J, Dalin G, Nilsdotter-Linde N, Spörndly E, editors, Biodiversity and animal feed: future challenges for grassland production. Sveriges Lantbruksuniversitet (SLU). 2008. p. 762-764. (Grassland Science in Europe, Vol. 13).

Nørgaard, Peder ; Nadeau, E. ; Volden, H. et al. / A new nordic structure evaluation system for diets fed to dairy cows. Biodiversity and animal feed: future challenges for grassland production. editor / A. Hopkins ; T. Gustafsson ; J. Bertilsson ; G. Dalin ; N. Nilsdotter-Linde ; E. Spörndly. Sveriges Lantbruksuniversitet (SLU), 2008. pp. 762-764 (Grassland Science in Europe, Vol. 13).

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abstract = "The objective of the Norfor structure system was to establish a model for prediction of eating- (EI), ruminating- (RI) and total chewing index (CI) for feeds and total rations fed to dairy cows. The model was predicted from a Meta analysis of more than 100 published experiments including results on eating, ruminating and total chewing time by cattle fed mainly high forage diets. The EI is proportional with the neutral detergent fibre (NDF) content and a particle size factor (Size_E) of the feed. The RI is proportional with the NDF content, a particle size factor (Size_R) and a hardness factor of the feed. The CI is estimated as the sum of the EI and RI. The Size_E and Size_R values are estimated from exponential functions of the most frequent particle length. The hardness factor is estimated as a linear function of the proportion of indigestible NDF in NDF. A minimum dietary CI value of 32 minutes per kg of total DMI is considered to ensure a sufficient intake of physically effective fibre in order to ensure good ruminal fibre digestion and to prevent a low rumen pH, digestive disorders and a low milk fat content in high-yielding dairy cows.",

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AU - Mehlqvist, M.

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N2 - The objective of the Norfor structure system was to establish a model for prediction of eating- (EI), ruminating- (RI) and total chewing index (CI) for feeds and total rations fed to dairy cows. The model was predicted from a Meta analysis of more than 100 published experiments including results on eating, ruminating and total chewing time by cattle fed mainly high forage diets. The EI is proportional with the neutral detergent fibre (NDF) content and a particle size factor (Size_E) of the feed. The RI is proportional with the NDF content, a particle size factor (Size_R) and a hardness factor of the feed. The CI is estimated as the sum of the EI and RI. The Size_E and Size_R values are estimated from exponential functions of the most frequent particle length. The hardness factor is estimated as a linear function of the proportion of indigestible NDF in NDF. A minimum dietary CI value of 32 minutes per kg of total DMI is considered to ensure a sufficient intake of physically effective fibre in order to ensure good ruminal fibre digestion and to prevent a low rumen pH, digestive disorders and a low milk fat content in high-yielding dairy cows.

AB - The objective of the Norfor structure system was to establish a model for prediction of eating- (EI), ruminating- (RI) and total chewing index (CI) for feeds and total rations fed to dairy cows. The model was predicted from a Meta analysis of more than 100 published experiments including results on eating, ruminating and total chewing time by cattle fed mainly high forage diets. The EI is proportional with the neutral detergent fibre (NDF) content and a particle size factor (Size_E) of the feed. The RI is proportional with the NDF content, a particle size factor (Size_R) and a hardness factor of the feed. The CI is estimated as the sum of the EI and RI. The Size_E and Size_R values are estimated from exponential functions of the most frequent particle length. The hardness factor is estimated as a linear function of the proportion of indigestible NDF in NDF. A minimum dietary CI value of 32 minutes per kg of total DMI is considered to ensure a sufficient intake of physically effective fibre in order to ensure good ruminal fibre digestion and to prevent a low rumen pH, digestive disorders and a low milk fat content in high-yielding dairy cows.

M3 - Article in proceedings

T3 - Grassland Science in Europe

SP - 762

EP - 764

BT - Biodiversity and animal feed

A2 - Hopkins, A.

A2 - Gustafsson, T.

A2 - Bertilsson, J.

A2 - Dalin, G.

A2 - Nilsdotter-Linde, N.

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PB - Sveriges Lantbruksuniversitet (SLU)

T2 - EGF General Meeting

Y2 - 9 June 2008 through 11 June 2008

ER -

A new nordic structure evaluation system for diets fed to dairy cows

Abstract

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