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.

Originalsprog	Engelsk
Titel	Biodiversity and animal feed : future challenges for grassland production
Redaktører	A. Hopkins, T. Gustafsson, J. Bertilsson, G. Dalin, N. Nilsdotter-Linde, E. Spörndly
Antal sider	3
Forlag	Sveriges Lantbruksuniversitet (SLU)
Publikationsdato	2008
Sider	762-764
Status	Udgivet - 2008
Begivenhed	EGF General Meeting - Uppsala, Sverige Varighed: 9 jun. 2008 → 11 jun. 2008 Konferencens nummer: 22

Konference

Konference	EGF General Meeting
Nummer	22
Land/Område	Sverige
By	Uppsala
Periode	09/06/2008 → 11/06/2008

Navn	Grassland Science in Europe
Vol/bind	13

Citationsformater

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

Publikation: Bidrag til bog/antologi/rapport › Konferencebidrag i proceedings › Forskning

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. i A Hopkins, T Gustafsson, J Bertilsson, G Dalin, N Nilsdotter-Linde & E Spörndly (red), Biodiversity and animal feed: future challenges for grassland production. Sveriges Lantbruksuniversitet (SLU), Grassland Science in Europe, bind 13, s. 762-764, EGF General Meeting, Uppsala, Sverige, 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. I Hopkins A, Gustafsson T, Bertilsson J, Dalin G, Nilsdotter-Linde N, Spörndly E, red., Biodiversity and animal feed: future challenges for grassland production. Sveriges Lantbruksuniversitet (SLU). 2008. s. 762-764. (Grassland Science in Europe, Bind 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. red. / A. Hopkins ; T. Gustafsson ; J. Bertilsson ; G. Dalin ; N. Nilsdotter-Linde ; E. Spörndly. Sveriges Lantbruksuniversitet (SLU), 2008. s. 762-764 (Grassland Science in Europe, Bind 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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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

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BT - Biodiversity and animal feed

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A2 - Bertilsson, J.

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ER -

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

Abstract

Konference

Fingeraftryk

Citationsformater