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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 Prediction of energy supply in ruminants, with emphasis on forages.

This review focuses upon developments in energy evaluation of feeds, particularly forages, with attention given to the role of in sacco and in vitro methods, in combination with mechanistic mathematical modelling, in predicting energy supply to the animal.

Author(s)
López, S.; Dijkstra, J.; France, J.
ISBN
2000 CABI Publishing (H ISBN 9780851993447)
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 Modelling lipid metabolism in the rumen.

Nutritional manipulation through fat supplementation of diets is of interest because of the large energy requirements of high-producing ruminants, and because of human health concerns about saturated long-chain fatty acids (LCFA) in ruminant products. High dietary fat levels may adversely affect...

Author(s)
Dijkstra, J.; Gerrits, W. J. J.; Bannink, A.; France, J.
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
CABI Book Chapter Info
Cover for Modelling production and portal appearance of volatile fatty acids in dairy cows.

Values of stoichiometric coefficients were estimated to describe the production of volatile fatty acids (VFA) from fermented substrate in the rumen of lactating cows. Coefficient estimates were derived by regression of in vivo data of rumen digestion to a stoichiometric model with non-linear...

Author(s)
Bannink, A.; Kogut, J.; Dijkstra, J.; France, J.; Tamminga, S.; Vuuren, A. M. van
ISBN
2000 CABI (H ISBN 9780851994499)
Type
Book chapter
CABI Book Chapter Info
Cover for Modelling energy expenditure in pigs.

In pigs, more than 50% of the ingested energy is dissipated as heat. The heat production of animals can be measured using indirect calorimetry, which is based on the concept that heat is produced through oxidation of nutrients. A technique was developed that allows modelling the dynamics of heat...

Author(s)
Milgen, J. van; Noblet, J.
ISBN
2000 CABI (H ISBN 9780851994499)
Type
Book chapter
CABI Book Chapter Info
Cover for Aspects of modelling kidney dynamics.

The kinetics of mineral transport in the kidney has previously been described using Michaelis-Menten kinetics. Mathematical analysis of this phenomenon has indicated that a better fit to experimental data can be achieved by considering the joint effects of diffusion and active transport processes...

Author(s)
Robson, B.; Vlieg, M.
ISBN
2000 CABI (H ISBN 9780851994499)
Type
Book chapter

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