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CAB eBooks

Ebooks on agriculture and the applied life sciences from CAB International

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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 Advantages of a dynamical approach to rumen function to help to resolve environmental issues.

Simulation studies demonstrated the difference between current practice (static representation) and a dynamic representation of rumen function. Where current feed evaluation indicated absent or linear responses to changes in dry matter intake (DMI) and exchange of grass and maize silage, simulated...

Author(s)
Bannink, A.; Dijkstra, J.; Kebreab, E.; France, J.
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 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 Development of a dynamic model of calcium and phosphorus flows in layers.

Phosphorus (P) is involved in most metabolic activities of the body as well as in bone formation. P and calcium (Ca) are closely related so that a deficiency in one can interfere with proper utilization of the other. In layers, requirement for dietary P is mainly due to the need to store Ca in...

Author(s)
Dijkstra, J.; Kebreab, E.; Kwakkel, R. P.; France, J.
ISBN
2006 CABI Publishing (H ISBN 9781845930059)
Type
Book chapter; Conference paper
CABI Book Chapter Info
Cover for Evaluation of models to predict methane emissions from enteric fermentation in North American dairy cattle.

The increasing focus on the environmental impact of agriculture means that there is a need for an accurate inventory of greenhouse gases (GHGs) to identify main sources of pollution and evaluate effects of potential mitigating options. A number of models have been developed to predict methane...

Author(s)
Kebreab, E.; France, J.; McBride, B. W.; Odongo, N.; Bannink, A.; Mills, J. A. N.; Dijkstra, J.
ISBN
2006 CABI Publishing (H ISBN 9781845930059)
Type
Book chapter; Conference paper
CABI Book Chapter Info
Cover for Functions for microbial growth.

The aim of this study was to evaluate the suitability of several mathematical functions for describing microbial growth curves. The functions considered were three-phase linear, logistic, Gompertz, Richards, Weibull and Baranyi. One data-set was used, comprising 34 curves stemming from viable count ...

Author(s)
López, S.; Prieto, M.; Dijkstra, J.; Kebreab, E.; Dhanoa, M. S.; France, J.
ISBN
2006 CABI Publishing (H ISBN 9781845930059)
Type
Book chapter; Conference paper
CABI Book Chapter Info
Cover for A kinetic model of phosphorus metabolism in growing sheep.

Research in Brazil has been carried out to study phosphorus (P) metabolism in ruminants, by using the isotope dilution technique. The purpose of this study was to use data from balance and kinetic experiments to solve a kinetic model of P metabolism in growing sheep fed with different diets. During ...

Author(s)
Dias, R. S.; Roque, A. R.; Nascimento Filho, V. F.; Vitti, D. M. S. S.; Bueno, I. C. S.
ISBN
2006 CABI Publishing (H ISBN 9781845930059)
Type
Book chapter; Conference paper
CABI Book Chapter Info
Cover for Dynamic simulation of phosphorus utilization in salmonid fish.

Minimizing phosphorus (P) wastes is a key factor for environmental sustainability of freshwater aquaculture operations. A dynamic model was constructed to simulate P utilization in salmonid fish through digestion, body deposition and excretion into urine and faeces. Dietary P was classified into...

Author(s)
Hua, K.; Cant, J. P.; Bureau, D. P.
ISBN
2006 CABI Publishing (H ISBN 9781845930059)
Type
Book chapter; Conference paper
CABI Book Chapter Info
Cover for Estimating the risk of hypomagnesaemic tetany in dairy herds.

A model of magnesium dynamics in sheep has been adapted and improved as part of a programme to develop a tool that will assist dairy farmers to assess the risk of animals in a milking herd suffering from hypomagnesaemic tetany. The terms in the model for hindgut absorption have been altered to...

Author(s)
Bell, S. T.; McKinnon, A. E.; Sykes, A. R.
ISBN
2006 CABI Publishing (H ISBN 9781845930059)
Type
Book chapter; Conference paper

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