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Partitioning of limiting protein and energy in the growing pig: testing quantitative rules against experimental data

Published online by Cambridge University Press:  08 March 2007

Fredrik B. Sandberg ,
Gerry C. Emmans  and
Ilias Kyriazakis
Fredrik B. Sandberg*
Affiliation:
Animal Nutrition and Health Department, Scottish Agricultural College, West Mains Road, Edinburgh, EH9 3JG, UK
Gerry C. Emmans
Affiliation:
Animal Nutrition and Health Department, Scottish Agricultural College, West Mains Road, Edinburgh, EH9 3JG, UK
Ilias Kyriazakis
Affiliation:
Animal Nutrition and Health Department, Scottish Agricultural College, West Mains Road, Edinburgh, EH9 3JG, UK
*
*Corresponding author: Mr Fredrik B. Sandberg, Animal Nutrition and Health Department, Scottish Agricultural College, Bush Estate, Penicuik EH26 0PH, UK, fax +44 (0)131 535 3121, email Fredrik.Sandberg@sac.ac.uk
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Abstract

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Literature solutions to the problem of protein and energy partitioning in the growing pig are quantitatively examined. Possible effects of live weight, genotype and food composition on the marginal response in protein retention to protein and energy intakes, on protein and energy-limiting foods are quantified. No evidence was found that the marginal response in protein retention to ideal protein supply, when protein intake is limiting, is affected by live weight, genotype or environmental temperature. There was good evidence that live weight does not affect the marginal response in protein retention to energy intake when protein intake is not limiting. Limited data for different genotypes suggested no effects on this response. A general quantitative partitioning rule is proposed that has two key parameters; ep* (the maximum marginal efficiency for retaining the first limiting amino acid) and R* (the maximum value of R, the energy to protein ratio of the food, MJ metabolisable energy (ME)/kg digestible crude protein (DCP), when ep* is just achieved). When R<R* the material efficiency of using ideal protein is (ep*/R*)× R. The value of ep* was determined to be 0·763 (se 0·0130). There was no good experimental evidence that ep* is different for different amino acids. The best estimate of R* was 67·9 (se 1·65) MJ ME/kg DCP. Live weight, genotype and temperature did not affect the values of either parameter. A more general understanding of partitioning, including the effects of ‘stressors’ such as disease, may be achieved by using the preferred rule as a starting point.

Keywords

SwineGrowthPartitioningProteinEnergy

Information

Type
Research Article
Information
British Journal of Nutrition , Volume 93 , Issue 2 , February 2005 , pp. 213 - 224
Copyright
Copyright © The Nutrition Society 2005

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