Prediction of lamb body composition using in vivo bioimpedance analysis

Abstract

The objective of this study was to evaluate the potential of in vivo bioimpedance analysis (BIA) as a method to estimate body composition in lambs. Thirty-one Texel x Ile de France crossbreed ram lambs were slaughtered at pre-determined intervals of average weights of 20, 26, 32, and 38 kg. Before the slaughter of the animals, their body weight (BW) and body length (BL) were measured. The values for resistance (Rs) and reactance (Xc) were collected using a single-frequency BIA equipment (Model RJL Quantum II Bioelectrical Body Composition Analyzer). The BIA main variables such as body bioelectrical volume (V), phase angle (PA), resistive density (RsD), and reactive density (XcD) were then 2 calculated. The soft tissue mass of the right-half cold carcass was analyzed in order to determine its chemical composition. Multiple regression analyses were performed using the lamb body composition as dependent variables and the measurements related to bioimpedance as independent variables. The best regression models were evaluated by cross-validation. The predictive model of moisture mass, which was developed by using XcD and V, accounted for 84% of its variation. Resulting models of percentage moisture (R 2 = 0.79), percentage lean mass (R 2 = 0.79), percentage fat (R 2 = 0.79), and fat mass (R 2 = 0.87) were obtained using RsD and V. Furthermore, the values of RsD regarding V, and PA in the prediction models accounted for 91% and 89% of variation in protein mass and lean mass, respectively. Bioimpedance analysis proved to be an efficient method to estimate the body composition of lambs slaughtered at different body mass stages.

Vitamin D status and obesity markers in older adults: results from West China Health and Aging Trends study

“…BMI was calculated by dividing body weight by height squared (kg/m 2 ). Fat mass index (FMI) and VFA were measured by bioelectrical impedance analysis (BIA) using an Inbody 770 (BioSpace, Seoul, Korea), which was a convenient method for the measurement of body composition [ 23 ]. Triceps skinfold (TSF) and mid-arm circumference (MAC) were taken midway between the olecranon and acromion in the dominant hand with the arm hanging relaxed at the side.…”

Body composition estimated by bioelectrical impedance analyses is diminished by prenatal stress in neonatal lambs and by heat stress in feedlot wethers

“…Needles were placed dorsally ~1 cm off the midline. Measurements were recorded in 5-s intervals for 30 s, resulting in six total measurements that were averaged and used in estimation equations for live animals and hot carcasses in Table 1 (Berg and Marchello, 1994; Slanger et al, 1994; Moro et al, 2019).…”

Análisis de impedancia bioeléctrica (AIB) en la producción animal. Revisión

“…In this context, PA has been widely used as an indicator of the nutritional condition in human beings as well as in animal carcasses, of quality assessment and raw cow milk adulteration (1,2,9) .…”

“…Some researchers (9) reported that they obtained weak relationship amongst most of the components of the carcasses. Moro et al (1) added phase angle, bioelectric volume, resistive and reactive density to their equations to associate with the components of the carcass since the resistive density can be related to these components and the reactive density might indicate the association with the concentration of lean mass.…”

“…In view of that, bioelectrical impedance (BIA) is characterized for being a technology of quick measurement, minimally invasive, relatively cost-effective and less subjective. BIA shows great potential to predict tissue chemical composition of farm animal carcasses (1) as well as to evaluate the quality of raw cow milk (2) . BIA analysis is based on the principle that body tissues have different impedances, it means an opposition to the flow of an ionic current.…”