title: Perspective of NIRS measurements early post mortem for prediction of pork quality.
abstract: The potential of near-infrared spectroscopy (NIRS) measurements early post mortem was investigated to predict ultimate drip loss, colour, tenderness and intra-muscular fat of pork. Three locations (M. longissimus thoracis, M. longissimus lumborum and M. semimembranosus) in 102 pig carcasses were tested at the end of the slaughter line. A priori variation in pork quality was introduced using an experimental design covering: genotype, lairage time, pre-slaughter handling and day of slaughter. At 1 h post mortem a diode array VIS/NIR instrument (Zeiss MCS 511/522, 380-1700 nm) equipped with a surface fibre optic probe was used and at 1 day post mortem ultimate pH, drip loss, colour and shear force was measured on similar locations. Results indicated that it was possible to predict intra-muscular fat content (correlation (R(2) of 0.35 with multiple linear regression), standard error of prediction (SEP)=3.6 g/kg), but the configuration has to be refined for on-line application (bigger aperture). For drip loss no correlation was achieved with the PLS method. Even extremes (low drip loss (<2.5%) or high drip loss (>4.5%)) in drip loss were not discriminated. Predicting drip loss with NIRS early post mortem is not successful, although NIRS in the slaughter line has potential as a fast predictor of intra-muscular fat. Possibilities for using the NIRS technique to get to know more about muscle metabolism and post mortem changes are promising.
authors: Animal Sciences Group Wageningen UR, P.O. Box 65, 8200 AB Lelystad, The Netherlands.
authors: A H
authors: AH
authors: Hoving-Bolink
authors: H W
authors: HW
authors: Vedder
authors: J W M
authors: JW
authors: Merks
authors: W J H
authors: WJ
authors: de Klein
authors: H G M
authors: HG
authors: Reimert
authors: R
authors: R
authors: Frankhuizen
authors: W H A M
authors: WH
authors: van den Broek
authors: En E
authors: EE
authors: Lambooij