Application of bioelectrical impedance analysis to assess rabbit's body composition from 25 to 77 days of age

Saiz, A. and García Ruiz, Ana Isabel and Fuentes-Pila Estrada, Joaquin and Nicodemus Martin, Nuria (2017). Application of bioelectrical impedance analysis to assess rabbit's body composition from 25 to 77 days of age. "Journal of Animal Science", v. 95 (n. 6); pp. 2782-2793. ISSN 0021-8812. https://doi.org/10.2527/jas.2016.1196.

Description

Title: Application of bioelectrical impedance analysis to assess rabbit's body composition from 25 to 77 days of age
Author/s:
  • Saiz, A.
  • García Ruiz, Ana Isabel
  • Fuentes-Pila Estrada, Joaquin
  • Nicodemus Martin, Nuria
Item Type: Article
Título de Revista/Publicación: Journal of Animal Science
Date: 8 June 2017
ISSN: 0021-8812
Volume: 95
Subjects:
Freetext Keywords: body composition; growing rabbits; impedance; mean prediction error; prediction equation
Faculty: E.T.S. de Ingeniería Agronómica, Alimentaria y de Biosistemas (UPM)
Department: Producción Agraria
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The aim of the study was to develop prediction equations for assessing, in vivo, the whole body composition of growing rabbits. The accuracy of the models obtained was externally validated with independent data sets. One hundred fifty rabbits grouped at 5 different ages (25, 35, 49, 63, and 77 d) were used. A body composition analyzer with 4 terminals was used to obtain resistance (Rs; Ω) and reactance (Xc; Ω) values. The distance between internal electrodes (D; cm), body length (Len; cm), and live BW (g) were also registered. Average values of Rs, Xc, impedance (Z), Len, D, and BW were 83.5 ± 23.1 Ω, 18.2 ± 3.8 Ω, 85.6 ± 22.9 Ω, 30.6 ± 6.9 cm, 10.8 ± 3.1 cm, and 1,454 ± 845 g, respectively. At each selected age, animals were slaughtered, ground, and frozen (−20°C) for determining water, fat, CP, ash, and GE (70.5 ± 3.36%, 27.7 ± 7.61% DM, 54.9 ± 5.41% DM, 11.1 ± 1.55% DM, and 2,267 ± 183 kJ/100 g DM, on average, respectively). Fat and GE contents increased with the age, whereas CP, ash, and water contents decreased. A multiple linear regression analysis was used to determine the prediction equations, using BW, Len, and Z data as independent variables. Equations obtained to estimate water (g), CP (g), fat (g), ash (g), and GE (MJ) had coefficient of determination (R2) values of 0.99, 0.99, 0.97, 0.98, and 0.99, respectively, and the relative mean prediction error (RMPE) was 2.79, 6.15, 24.3, 15.2, and 10.6%, respectively. When water was expressed as a percentage, the R2 and RMPE were 0.85 and 2.30%, respectively. When prediction of the content of protein (% DM), fat (% DM), ash (% DM), and energy (kJ/100 g DM) was done, values of 0.79, 0.83, 0.71, and 0.86, respectively, for R2 and 5.04, 18.9, 12.0, and 3.19%, respectively, for RMPE were obtained. It could be concluded that bioelectrical impedance analysis is a good, noninvasive method to estimate, in vivo, whole body composition of growing rabbits from 25 to 77 d of age.

More information

Item ID: 50052
DC Identifier: http://oa.upm.es/50052/
OAI Identifier: oai:oa.upm.es:50052
DOI: 10.2527/jas.2016.1196
Official URL: https://academic.oup.com/jas/article/95/6/2782/4702659
Deposited by: Memoria Investigacion
Deposited on: 12 Apr 2018 09:21
Last Modified: 08 Jun 2018 22:30
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