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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 An ingredient-based input scheme for Molly.

The model described by Baldwin and co-workers (Baldwin et al., 1987; Baldwin, 1995) known as Molly utilizes a nutrient-based input scheme, where each nutrient is generally treated as a homogeneous substrate regardless of the source of that nutrient. The exception is a limited, discrete...

Author(s)
Hanigan, M. D.; Bateman, H. G.; Fadel, J. G.; McNamara, J. P.; Smith, N. E.
ISBN
2006 CABI Publishing (H ISBN 9781845930059)
Type
Book chapter; Conference paper
CABI Book Chapter Info
Cover for Metabolic control: improvement of a dynamic model of lactational metabolism in early lactation.

A mechanistic, dynamic model of metabolism exists to allow testing of complex hypotheses on nutrient metabolism of the dairy cow. The model describes protein synthesis and degradation in the viscera and muscle, lipogenesis and lipolysis in the adipose tissue, and milk synthesis. It is dynamic,...

Author(s)
McNamara, J. P.
ISBN
2006 CABI Publishing (H ISBN 9781845930059)
Type
Book chapter; Conference paper
CABI Book Chapter Info
Cover for Mechanistic modelling at the metabolic level: a model of metabolism in the sow as an example.

This chapter presents a model of metabolism in the sow. A brief description of dynamic, mechanistic, metabolic models is given. The integration of genetic elements into metabolic models is discussed. The modelling process (experimentation, hypothesis setting and improvement) is outlined.

Author(s)
McNamara, J. P.
ISBN
2006 CABI (H ISBN 9781845930707)
Type
Book chapter; Conference paper
CABI Book Chapter Info
Cover for Challenge and improvement of a model of post-absorptive metabolism in dairy cattle.

We have been conducting research to improve quantitative descriptions of metabolism in lactating dairy cows depicted in an existing mechanistic, computer-assisted model. The objective was to challenge this model with data collected in in vivo and in vitro experiments on high-producing dairy cattle...

Author(s)
McNamara, J. P.; Phillips, G. J.
ISBN
2000 CABI (H ISBN 9780851994499)
Type
Book chapter
CABI Book Chapter Info
Cover for Integrating the effects of genotype and nutrition on utilization of body reserves during lactation of dairy cattle.

This chapter discusses the quantitative regulatory mechanisms and descriptions of body reserve storage, and its utilization during lactation. It also discusses the body fat reserves and metabolism in dairy cattle, body protein reserves in lactating dairy cattle, and integration of nutrient...

Author(s)
McNamara, J. P.
ISBN
2000 CABI (H ISBN 9780851994635)
Type
Book chapter
CABI Book Chapter Info
Cover for The role of thermodynamics in controlling rumen metabolism.

Chemical reactions are controlled either thermodynamically or kinetically. Most mechanistic biological models assume kinetic control of metabolism pathways. The profile of products formed depends on substrate concentrations and enzyme activities, which control the rates of synthesis for competing...

Author(s)
Kohn, R. A.; Boston, R. C.
ISBN
2000 CABI (H ISBN 9780851994499)
Type
Book chapter
CABI Book Chapter Info
Cover for Towards a more accurate representation of fermentation in mathematical models of the rumen.

Most mathematical models of the rumen make use of empirical stoichiometric equations to predict the production of fermentation products in the rumen. These models are based on a one, two and three microbial group representation of the total rumen microbial population. The prediction of total VFA...

Author(s)
Nagorcka, B. N.; Gordon, G. L. R.; Dynes, R. A.
ISBN
2000 CABI (H ISBN 9780851994499)
Type
Book chapter
CABI Book Chapter Info
Cover for Simple allometric models to predict rumen feed passage rate in domestic ruminants.

A database was developed from the literature (36 publications) to explore the mechanisms controlling rumen feed passage rate (Kp) and to predict it. The database included the results of 157 different dietary treatments and passage rate measurements with 45 treatments on dry sheep or wethers, 42 on...

Author(s)
Cannas, A.; Soest, P. J. van
ISBN
2000 CABI (H ISBN 9780851994499)
Type
Book chapter
CABI Book Chapter Info
Cover for Ruminal metabolism of buffersoluble proteins, peptides and amino acids <i xmlns="http://www.w3.org/1999/xhtml">in vitro</i>.

A complex mechanistic model of soluble protein degradation was developed and fitted to literature data of in vitro rumen casein (CAS) and acid-hydrolysed casein (AHCAS) fermentation. Feed amino acid escape was estimated from this model and was compared with estimates made with a simple model of...

Author(s)
Udén, P.
ISBN
2000 CABI (H ISBN 9780851994499)
Type
Book chapter
CABI Book Chapter Info
Cover for Models to interpret degradation profiles obtained from <i xmlns="http://www.w3.org/1999/xhtml">in vitro</i> and <i xmlns="http://www.w3.org/1999/xhtml">in situ</i> incubation of ruminant feeds.

Degradation kinetic parameters are usually estimated from degradation profiles obtained using the polyester bag technique or the gas production technique. Models to describe either in situ disappearance curves or gas production profiles were derived from first principles by considering simple...

Author(s)
López, S.; France, J.; Dijkstra, J.; Dhanoa, M. S.
ISBN
2000 CABI (H ISBN 9780851994499)
Type
Book chapter

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