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Estimation of whole body lipid mass in finishing pigs

Published online by Cambridge University Press:  09 March 2007

M. Kloareg ,
J. Noblet  and
J. Van Milgen
M. Kloareg
Affiliation:
UMR Systèmes dˇElevage, Nutrition Animale et Humaine, INRA, 35590 Saint-Gilles, France
J. Noblet
Affiliation:
UMR Systèmes dˇElevage, Nutrition Animale et Humaine, INRA, 35590 Saint-Gilles, France
J. Van Milgen*
Affiliation:
UMR Systèmes dˇElevage, Nutrition Animale et Humaine, INRA, 35590 Saint-Gilles, France
*
†E-mail: jaap.vanmilgen@rennes.inra.fr
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Abstract

Most nutritional pig growth models are based on the deposition of whole body protein (P) and lipid (L) mass. Chemical analysis of the whole animal is the best method to determine body composition. However, this method is expensive, time consuming and the carcass is lost. Alternatively, P and L may be estimated using simple indicators that should be precise and easily accessible. Although empty body weight (EBW) is a good indicator for P (through the strong relation between water and P), L is more difficult to estimate. This study was carried out to evaluate the relationship between simple carcass measurements and L. Measurements included backfat thickness in vivo and at slaughter in the hot and cold carcass and the weight of carcass, organs and primal cuts. To maximize variations in adiposity a total of 30 females and barrows from two genotypes (Piétrain×(Landrace×Large White) and Large White) were slaughtered at body weights typically used in Europe (i.e. 90 to 150 kg) and ground for chemical analysis. Backfat mass (in combination with EBW) was the best indicator for L (L (kg)=0·0590×EBW (kg)+2·99×backfat mass (kg), R2=0·96). Different backfat thickness measurements were highly correlated and appeared reasonable indicators for total backfat mass. Backfat thickness measured in the hot carcass between 3rd and 4th last lumbar vertebra at 8 cm from the mid line was the second best indicator for L (L=(0·0855+0·0073×backfat thickness)×EBW, R2=0·94). On average, 18% of total body lipids were located in the backfat. Although these equations can be used to obtain a reasonable estimate of whole body lipid mass, a significant genotype effect remained. Differences between genotypes in the partitioning of lipids between different tissues suggest that the quantification of an external lipid depot alone is insufficient to precisely estimate whole-body lipid mass across genotypes.

Keywords

backfatbody compositionlipidspigs
Type
Research Article
Information
Animal Science , Volume 82 , Issue 2 , April 2006 , pp. 241 - 251
Copyright
Copyright © British Society of Animal Science 2006

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