An integrated mathematical model to evaluate nutrient partition in dairy cattle between the animal and its environment

E. Kebreab, J.A.N. Mills, L.A. Crompton, A. Bannink, J. Dijkstra, W.J.J. Gerrits, J. France

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Abstract

In the past decade, a number of mechanistic, dynamic simulation models of several components of the dairy production system have become available. However their use has been limited due to the detailed technical knowledge and special software required to run them, and the lack of compatibility between models in predicting various metabolic processes in the animal. The first objective of the current study was to integrate the dynamic models of [Brit. J. Nutr. 72 (1994) 679] on rumen function, [J. Anim. Sci. 79 (2001) 1584] on methane production, [J. Anim. Sci. 80 (2002) 248] on N partition, and a new model of P partition. The second objective was to construct a decision support system to analyse nutrient partition between animal and environment. The integrated model combines key environmental pollutants such as N, P and methane within a nutrient-based feed evaluation system. The model was run under different scenarios and the sensitivity of various parameters analysed. A comparison of predictions from the integrated model with the original simulation models showed an improvement in N excretion since the integrated model uses the dynamic model of [Brit. J. Nutr. 72 (1994) 679] to predict microbial N, which was not represented in detail in the original model. The integrated model can be used to investigate the degree to which production and environmental objectives are antagonistic, and it may help to explain and understand the complex mechanisms involved at the ruminal and metabolic levels. A part of the integrated model outputs were the forms of N and P in excreta and methane, which can be used as indices of environmental pollution.
Original languageEnglish
Pages (from-to)131-154
JournalAnimal Feed Science and Technology
Volume112
Issue number1-4
DOIs
Publication statusPublished - 2004

Fingerprint

dairy cattle
mathematical models
nutrients
animals
dynamic models
methane
simulation models
forage evaluation
decision support systems
excreta
methane production
rumen fermentation
milk production
production technology
excretion
pollution
pollutants
prediction

Keywords

  • grass-silage diets
  • nitrogen-utilization
  • mechanistic model
  • milk-production
  • fed sugarcane
  • cows
  • digestion
  • phosphorus
  • metabolism
  • simulation

Cite this

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title = "An integrated mathematical model to evaluate nutrient partition in dairy cattle between the animal and its environment",
abstract = "In the past decade, a number of mechanistic, dynamic simulation models of several components of the dairy production system have become available. However their use has been limited due to the detailed technical knowledge and special software required to run them, and the lack of compatibility between models in predicting various metabolic processes in the animal. The first objective of the current study was to integrate the dynamic models of [Brit. J. Nutr. 72 (1994) 679] on rumen function, [J. Anim. Sci. 79 (2001) 1584] on methane production, [J. Anim. Sci. 80 (2002) 248] on N partition, and a new model of P partition. The second objective was to construct a decision support system to analyse nutrient partition between animal and environment. The integrated model combines key environmental pollutants such as N, P and methane within a nutrient-based feed evaluation system. The model was run under different scenarios and the sensitivity of various parameters analysed. A comparison of predictions from the integrated model with the original simulation models showed an improvement in N excretion since the integrated model uses the dynamic model of [Brit. J. Nutr. 72 (1994) 679] to predict microbial N, which was not represented in detail in the original model. The integrated model can be used to investigate the degree to which production and environmental objectives are antagonistic, and it may help to explain and understand the complex mechanisms involved at the ruminal and metabolic levels. A part of the integrated model outputs were the forms of N and P in excreta and methane, which can be used as indices of environmental pollution.",
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An integrated mathematical model to evaluate nutrient partition in dairy cattle between the animal and its environment. / Kebreab, E.; Mills, J.A.N.; Crompton, L.A.; Bannink, A.; Dijkstra, J.; Gerrits, W.J.J.; France, J.

In: Animal Feed Science and Technology, Vol. 112, No. 1-4, 2004, p. 131-154.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - An integrated mathematical model to evaluate nutrient partition in dairy cattle between the animal and its environment

AU - Kebreab, E.

AU - Mills, J.A.N.

AU - Crompton, L.A.

AU - Bannink, A.

AU - Dijkstra, J.

AU - Gerrits, W.J.J.

AU - France, J.

PY - 2004

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N2 - In the past decade, a number of mechanistic, dynamic simulation models of several components of the dairy production system have become available. However their use has been limited due to the detailed technical knowledge and special software required to run them, and the lack of compatibility between models in predicting various metabolic processes in the animal. The first objective of the current study was to integrate the dynamic models of [Brit. J. Nutr. 72 (1994) 679] on rumen function, [J. Anim. Sci. 79 (2001) 1584] on methane production, [J. Anim. Sci. 80 (2002) 248] on N partition, and a new model of P partition. The second objective was to construct a decision support system to analyse nutrient partition between animal and environment. The integrated model combines key environmental pollutants such as N, P and methane within a nutrient-based feed evaluation system. The model was run under different scenarios and the sensitivity of various parameters analysed. A comparison of predictions from the integrated model with the original simulation models showed an improvement in N excretion since the integrated model uses the dynamic model of [Brit. J. Nutr. 72 (1994) 679] to predict microbial N, which was not represented in detail in the original model. The integrated model can be used to investigate the degree to which production and environmental objectives are antagonistic, and it may help to explain and understand the complex mechanisms involved at the ruminal and metabolic levels. A part of the integrated model outputs were the forms of N and P in excreta and methane, which can be used as indices of environmental pollution.

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KW - grass-silage diets

KW - nitrogen-utilization

KW - mechanistic model

KW - milk-production

KW - fed sugarcane

KW - cows

KW - digestion

KW - phosphorus

KW - metabolism

KW - simulation

U2 - 10.1016/j.anifeedsci.2003.10.009

DO - 10.1016/j.anifeedsci.2003.10.009

M3 - Article

VL - 112

SP - 131

EP - 154

JO - Animal Feed Science and Technology

JF - Animal Feed Science and Technology

SN - 0377-8401

IS - 1-4

ER -