Download e-book for iPad: Modelling nutrient utilization in farm animals by John P McNamara, James France

By John P McNamara, James France

ISBN-10: 0851994490

ISBN-13: 9780851994499

This ebook describes present examine in modeling nutrient use in cattle, from mobile to atmosphere point. The chapters are built from papers offered at a satellite tv for pc assembly of the ninth foreign Symposium on Ruminant body structure, held in South Africa in October 1999.

* very good papers from a most sensible record of contributors
* Editors of significant reputation
* Covers the present issues of curiosity

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1. Major fermentation pathways in the rumen (adapted from Prins, 1977). decrease the threshold DG (make it more negative) for acetate and would shift the equilibrium against acetate production. The glucose spared from this shift would further increase propionate production, which would decrease H2 available for methane. As the energy density of the diet increases, acetate-to-propionate ratio and methane production decline while H2 concentration increases. Since methane does not increase in response to the increased H2, the calculated efficiency for methanogenesis would decrease.

1985), the apparent degree of duodenal LCFA saturation also increased upon an increase in roughage proportion of the diet. The simulated effect of dietary roughage on the biohydrogenation of unsaturated LCFA was similar to that observed by Pantoja et al. , 1994), but was less pronounced than that observed by Kalscheur et al. (1997a), in which pH was observed to be lower with the low-forage diet. A reduced pH may lower the rate of hydrolysis of dietary lipid and thus may increase the protection against biohydrogenation (reviewed by Jenkins, 1993), but this effect was not represented in the model.

G, Gas; aq, dissolved. 2. Key reactions in the rumen: standard change in enthalpy in kJ molϪ1 (DH°), standard change in free energy at 298 K in kJ molϪ1 (DG°298) and standard change in free energy at 311 K in kJ molϪ1 (DG°311). A. C. Boston 02 Mod Nutrient ch1 30/8/00 3:44 pm Page 19 Role of Thermodynamics in Rumen Metabolism 19 The DG for this reaction is negative, so the reaction is feasible. 4 kJ molϪ1 (19) The DG is negative so the reaction is feasible under these conditions. However, the production of ATP was not considered for these reactions.

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Modelling nutrient utilization in farm animals by John P McNamara, James France

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