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Dual-energy X-ray absorptiometry scans accurately predict differing body fat content in live sheep

Citation

Miller, DW and Bennett, EJ and Harrison, JL and Anderson, F and Adam, CL, Dual-energy X-ray absorptiometry scans accurately predict differing body fat content in live sheep, Journal of Animal Science and Biotechnology, 9 Article 80. ISSN 1674-9782 (2018) [Refereed Article]


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DOI: doi:10.1186/s40104-018-0295-4

Abstract

Background: There is considerable interest in implementing mobile scanning technology for on-farm body composition analysis on live animals. These experiments evaluated the use of dual energy X-ray absorptiometry (DXA) as an accurate method of total body fat measurement in live sheep. Results: In Exp. 1, visceral and whole body fat analysis was undertaken in sheep with body condition scores (BCS) in the range 2 to 3.25 (scale 1: thin to 5: fat). The relationship of BCS was moderately correlated with visceral fat depot mass (r=0.59, P<0.01, n=24) and whole body fat (r=0.70, P<0.001, n=24). In Exp. 2, sheep with BCS in the range 2.25 to 3.75 were blood sampled to analyse circulating leptin concentrations, and were DXA scanned immediately post mortem for total body fat. Plasma leptin concentrations had low correlations with BCS (r=0.50, P<0.05, n=17) and DXA body fat (r=0.42, P<0.05, n=17), and no correlation with chemical body fat (r=0.17, P>0.05, n=9). There was a moderate correlation between DXA body fat and BCS (r=0.70, P<0.01, n=17), and DXA body fat was highly correlated with chemical body fat (r=0.81, P<0.001, n=9). In Exp. 3, a series of five DXA scans, at 8-week intervals, was performed on growing sheep over a 32-week period. The average BCS ranged from 2.390.07 (S.E.M.) to 3.05 +/- 0.11 and the DXA body fat (%) ranged from 16.8 +/- 0.8 to 24.2 +/- 1.2. There was a moderate correlation between DXA body fat and BCS over the 32weeks (r=0.61, P<0.001, n=24). Conclusions: p id=Par3 Overall, these experiments indicated that there was good agreement between BCS, DXA and chemical analysis for measuring total body fat in sheep, and that DXA scanning is a valid method for longitudinal measurement of total body fat in live sheep.

Item Details

Item Type:Refereed Article
Keywords:BCS, DEXA, fat, leptin, longitudinal, Sheep
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Agriculture, land and farm management
Research Field:Agriculture, land and farm management not elsewhere classified
Objective Division:Animal Production and Animal Primary Products
Objective Group:Livestock raising
Objective Field:Sheep for meat
UTAS Author:Bennett, EJ (Dr Emma Bennett)
ID Code:152669
Year Published:2018
Web of Science® Times Cited:4
Deposited By:Engineering
Deposited On:2022-08-23
Last Modified:2022-08-23
Downloads:0

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