Abstract
Abstract. Near-infrared (NIR) interactance was evaluated as a potentially new method for estimating live body and carcass composition of pigs. Using a surface placed fiber optic probe, measurements of the live animal and carcass were made on a total of 120 pigs. These measurements were compared with lipid and protein content of soft tissue dissected from the pig carcass. NIR results were evaluated using multiple regression equations containing NIR readings at various locations on the body, combinations of wavelengths and with or without ultrasonic fat depth readings and body weight. NIR measurements made on the carcass predicted percent carcass fat (R = 0.71) better than did measurements made on the live animal (R = 0.66), however, both could be improved substantially by including live body weight in the prediction equation (R = 0.93 and 0.91). Spectral information indicated that the depth of tissue penetration and reflectance may be the primary limitation in this application of the current technology.
Highlights
Compositional analysis by near-infrared (NIR) spectroscopy is based on the detection of definitive transmission or reflectance characteristics of radiation in the 850 to 2600 nm region by the major components of the sample in question
The estimation with the pig could be improved by including live body weight in the equation, NIR alone is a better indicator of the value of the method
Human studies reported by WILSON and HEYWARD (1992) and WILMORE et al, (1994) indicated that only the NIR reading from the biceps contributed significantly to the variance in percent body fat as measured by hydrostatic weighing
Summary
Compositional analysis by near-infrared (NIR) spectroscopy is based on the detection of definitive transmission or reflectance characteristics of radiation in the 850 to 2600 nm region by the major components (i.e., water, fat or protein) of the sample in question. NIR is widely used to predict the composition or quality of various plant materials (NORRIS, 1983) This technique has been studied as a method for compositional analysis of homogeneous samples of animal tissues (KRUGGEL et al, 1981; LANZA, 1983) or whole-carcass composition of homogeneously prepared. CONWAY et al (1984) evaluated infrared interactance as a means of estimating body composition in human subjects The latter approach utilized a fiber optic probe with multiple site measurements on the body. SHIMAMOTO et al (2004) measured the fat content of frozen and thawed mackerel by near infrared spectroscopy using a fiber optic probe in the interactance mode. From these studies it appears that NIR offers a potentially rapid, noninvasive technique for estimation of body composition
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