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CAB eBooks

Ebooks on agriculture and the applied life sciences from CAB International

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CABI Book Info
Cover for Nutrient digestion and utilization in farm animals: modelling approaches.

This book contains 34 chapters on nutrition physiology and presents scientific research in modelling nutrient digestion and utilization in domestic animals, including cattle, sheep, pigs, poultry and fishes. It is divided into 6 parts that cover fermentation, absorption and passage; growth and...

Author(s)
Kebreab, E.; Dijkstra, J.; Bannink, A.; Gerrits, W. J. J.; France, J.
ISBN
2006 CABI Publishing (H ISBN 9781845930059)
Type
Book; Conference proceedings
CABI Book Chapter Info
Cover for Empirical modelling through meta-analysis vs mechanistic modelling.

During the 1980s numerous papers had underlined that a mechanistic model would be more appropriate than an empirical one to understand and simulate animal responses to diets. The major criticism against empirical models was the strong limitation of their possibilities of application beyond the...

Author(s)
Sauvant, D.; Martin, O.
ISBN
2006 CABI Publishing (H ISBN 9781845930059)
Type
Book chapter; Conference paper
CABI Book Chapter Info
Cover for Iterative development, evaluation and optimal parameter estimation of a dynamic simulation model: a case study.

Parameter estimation and model evaluation are crucial parts of the development of predictive simulation models. However, a lack of synchronization is often observed in the activities of modelling and experimentation in agriculture. One of the causes of the communication gap between modellers and...

Author(s)
Barioni, L. G.; Oltjen, J. W.; Sainz, R. D.
ISBN
2006 CABI Publishing (H ISBN 9781845930059)
Type
Book chapter; Conference paper
CABI Book Chapter Info
Cover for Segmented, constrained, non-linear, multi-objective, dynamic optimization methodology applied to the dairy cow ration formulation problem.

In the last meeting of this series of modelling workshops we reported on the development of an optimization scheme for dealing with dairy cow ration formulation, in an optimal way, in the situation where constraints were both non-linear and discontinuous in their arguments. Indeed, we illustrated...

Author(s)
Boston, R. C.; Hanigan, M. D.
ISBN
2006 CABI Publishing (H ISBN 9781845930059)
Type
Book chapter; Conference paper
CABI Book Chapter Info
Cover for A model to simulate the effects of different dietary strategies on the sustainability of a dairy farm system.

A new model is being developed to study the main elements that affect sustainability within a dairy farm by using multiple goal programming. In this work, we describe the main characteristics of this modelling approach and we evaluate, via optimization, the effect of different dietary strategies...

Author(s)
Prado, A. del; Scholefield, D.; Brown, L.
ISBN
2006 CABI Publishing (H ISBN 9781845930059)
Type
Book chapter; Conference paper
CABI Book Chapter Info
Cover for Simulation of rumen particle dynamics using a non-steady state model of rumen digestion and nutrient availability in dairy cows fed sugarcane.

An extant dynamic model of digestion and absorption of nutrients in cattle fed sugarcane was adapted for non-steady state feeding conditions. This modified model includes mechanisms of particle size reduction and delay in availability of particles and intracellular contents for microbial...

Author(s)
Collao-Saenz, E. A.; Bannink, A.; Kebreab, E.; France, J.; Dijkstra, J.
ISBN
2006 CABI Publishing (H ISBN 9781845930059)
Type
Book chapter; Conference paper
CABI Book Chapter Info
Cover for Modelling fluxes of volatile fatty acids from rumen to portal blood.

A model was developed that describes the relationships between the production, the ruminal concentrations and the fluxes of volatile fatty acids (VFAs) across portal drained viscera (PDV). This study presents some preliminary results. Firstly, general steady state relationships between production...

Author(s)
Nozière, P.; Hoch, T.
ISBN
2006 CABI Publishing (H ISBN 9781845930059)
Type
Book chapter; Conference paper
CABI Book Chapter Info
Cover for A composite model of growth, pregnancy and lactation.

Mathematical models of pre- and postnatal growth, pregnancy and lactation were combined and implemented using object-orientated computer code to form an energy-based model of a dairy cow. Each simulated cow 'grows', can have a computer pregnancy with multiple offspring, growing its fetuses to term, ...

Author(s)
Vetharaniam, I.; Davis, S. R.
ISBN
2006 CABI Publishing (H ISBN 9781845930059)
Type
Book chapter; Conference paper
CABI Book Chapter Info
Cover for Introduction: history, appreciation and future focus.

Author(s)
France, J.
ISBN
2006 CABI Publishing (H ISBN 9781845930059)
Type
Book chapter; Conference paper
CABI Book Chapter Info
Cover for Prediction of body weight and composition from body dimension measurements in lactating dairy cows.

Body composition data and live animal measurements were obtained from 146 Holstein × Friesian lactating cows. Live animal measurements were recorded 3 or 4 days prior to slaughter, including live weight (LW), body condition score (BCS), girth, belly girth, height and length. The objective was to...

Author(s)
Yan, T.; Agnew, R. E.; Mayne, C. S.; Patterson, D. C.
ISBN
2006 CABI Publishing (H ISBN 9781845930059)
Type
Book chapter; Conference paper

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