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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 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 Evaluation of a growth model of preruminant calves and modifications to simulate shortterm responses to changes in protein intake.

Recently, a mechanistic simulation model was developed which integrates protein and energy metabolism of preruminant calves of 80 to 240 kg live-weight (LW). The model can be used to predict the rate of gain of weight, protein and fat from nutrient input. A serial slaughter experiment was conducted ...

Author(s)
Gerrits, W. J. J.; Togt, P. L. van der; Dijkstra, J.; France, J.
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 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 The utilization of prediction models to optimize farm animal production systems: the case of a growing pig model.

In the last 25 years, mathematical models for growing animals have been developed to predict growth from knowledge on animal biology. The increasing precision of these models allows them to be used to evaluate economic return and/or environmental impact of the simulated production system. It is...

Author(s)
Bailleul, P. J. dit; Bernier, J. F.; Milgen, J. van; Sauvant, D.; Pomar, C.
ISBN
2000 CABI (H ISBN 9780851994499)
Type
Book chapter
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 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 Evaluation of a representation of the limiting amino acid theory for milk protein synthesis.

A model describing amino acid (AA) metabolism by the mammary glands of the lactating cow has been constructed (Hanigan et al., 2000a). Milk protein production was predicted using a mathematical procedure to determine which among histidine (His), lysine (Lys), methionine (Met), threonine (Thr) and...

Author(s)
Hanigan, M. D.; France, J.; Crompton, L. A.; Bequette, B. J.
ISBN
2000 CABI (H ISBN 9780851994499)
Type
Book chapter
CABI Book Chapter Info
Cover for Linear models of nitrogen utilization in dairy cows.

Linear models describing relationships between nitrogen (N) intake and N output were constructed based on N-balance data from experiments conducted at the Centre for Dairy Research (CEDAR). The models were then applied to a second set of data derived from a series of N-balance experiments conducted ...

Author(s)
Kebreab, E.; Allison, R.; Mansbridge, R.; Beever, D. E.; France, J.
ISBN
2000 CABI (H ISBN 9780851994499)
Type
Book chapter
CABI Book Chapter Info
Cover for Isotope dilution models for partitioning amino acid uptake by the liver, mammary gland and hindlimb tissues of ruminants.

Isotope dilution models for partitioning leucine uptake by the liver and mammary gland, and tyrosine uptake by the hindlimb of ruminants have been constructed and solved in the steady state. The models require the measurement of plasma flow rate through the tissue beds in combination with...

Author(s)
Crompton, L. A.; France, J.; Bequette, B. J.; Maas, J. A.; Hanigan, M. D.; Lomax, M. A.; Dijkstra, J.
ISBN
2000 CABI (H ISBN 9780851994499)
Type
Book chapter

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