The measurement of light scattering and electrical conductivity for the prediction of PSE pig meat at various times post mortem

Oliver, M.A.; Gispert, M.; Tibau, J.; Diestre, A.

doi:10.1016/0309-1740(91)90061-t

Cited by 44 publications

(18 citation statements)

References 6 publications

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“…This method is essentially a predictive tool that attempts to assign a new observation to a category on the basis of the characteristics of known members of that category (Lachenbruch 1975). A priori prediction using DA has been exploited in a number of areas, for example to anticipate quality characteristics of potatoes, tea, and meat (Oliver et al 1991;Taylor etal. 1992;Girard&Nakai 1994b;Orr et al 1994;Downey & Beauchene 1997).…”

Section: Introductionmentioning

confidence: 99%

Predicting survival of western rock lobstersPanulirus cygnususing discriminant analysis of haemolymph parameters taken immediately following simulated handling treatments

Paterson¹,

Spanoghe

Davidson

et al. 2005

New Zealand Journal of Marine and Freshwater Research

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Instances of morbidity amongst rock lobsters (Panulirus cygnus) arriving at factories in Western Australia (WA) have been attributed to stress during post-harvest handling. This study used discriminant analysis to determine whether physiological correlates of stress following a period of simulated post-harvest handling had any validity as predictors of future rejection or morbidity of western rock lobsters. Groups of 230 western rock lobsters were stored for 6 h in five environments (submerged/flowing sea water, submerged/ recirculating sea water, humid air, flowing seawater spray, and recirculated seawater spray). The experiment was conducted in late spring (ambient sea water 22°C), and repeated again in early autumn (ambient sea water 26°C). After 6 h treatment, each lobster was graded for acceptability for live export, numbered, and its haemolymph was sampled. The samples were analysed for a number of physiological and health status parameters. The lobsters were then stored for a week in tanks in the live lobster factory to record mortality. The mortality of lobsters in the factory was associated with earlier deviations in haemolymph parameters as they emerged from the storage treatments. Discriminant analysis (DA) of the haemolymph assays enabled the fate of 80-90% of the lobsters to be correctly categorised within each experiment. However, functions derived from one experiment were less accurate at predicting mortality when applied to the other experiments. One of the reasons for this was the higher mortality and the more severe patho-physiological changes observed in lobsters stored in humid air or sprays at the higher temperature. The analysis identified lactate accumulation during emersion and associated physiological and haemocyte-related effects as a major correlate of mortality. Reducing these deviations, for example by submerged transport, is expected to ensure high levels of survival. None of the indicators tested predicted mortality with total accuracy. The simplest and most accurate means of comparing emersed treatments was to count the mortality afterwards.

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Section: Introductionmentioning

confidence: 99%

Predicting survival of western rock lobstersPanulirus cygnususing discriminant analysis of haemolymph parameters taken immediately following simulated handling treatments

Paterson¹,

Spanoghe

Davidson

et al. 2005

New Zealand Journal of Marine and Freshwater Research

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“…Table 5 shows the percentage of animals per line with PSE and DFD meat of the Semimembranosus muscle from the right ham depending on the threshold chosen for pH 45 , EC 24 and pH 24 . According to Oliver et al, 34 PSE meat presented a pH < 6 at 45min post mortem and an EC > 10 at 24 h post mortem.…”

Section: Results and Discussion Carcass Traits And Meat Quality Measumentioning

confidence: 99%

Pig sire type and sex effects on carcass traits, meat quality and physicochemical and sensory characteristics of Serrano dry‐cured ham

et al. 2005

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This study demonstrates that improvements in animal line selection by breeding enterprises exert a strong effect on carcass traits, meat quality and sensory characteristics of Serrano dry-cured ham. A total of 461 pigs from the offspring of a Duroc (DU) × Landrace (LD) sow mated with two DU boars and a DU × Large White (LW) boar from three breeding enterprises were evaluated. The two DU terminal sires were significantly different (P < 0.05) in carcass conformation, backfat thickness, ham and loin yields, raw ham traits, myoglobin concentration and total pigments formed during the curing process; in addition, the two lines provided different percentages of hams (54 vs 91%) with sufficient subcutaneous fat and weight to manufacture dry-cured Serrano hams using a slow ripening process (11 months). The DU × LW sire had the best carcass and ham traits from an economic standpoint and obtained highest scores for sensory characteristics of Serrano ham evaluated by a trained panel test; furthermore, this line provided 84% of total hams suitable for manufacturing Serrano hams by a slow process. When the sex effect was analysed, carcass and ham traits of females were more favourable, but females presented a higher incidence of pale, soft and exudative (PSE) meat and a lower percentage of hams with sufficient subcutaneous fat and weight to produce Serrano hams using a slow ripening process (61% for females and 91% for castrates). On the other hand, castrates provided Serrano hams cured by a slow procedure with better organoleptic characteristics than females. Right and left hams were similar.

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“…pH and conductivity values in the LTL were significantly correlated with the SM muscle measurements (on the same side) at 45 min and 3 h post mortem (r = 0.46-0.88, P < 0.05). Oliver et al 24 reported significant correlations (r = 0.74-0.80) at the same time points and concluded that it is possible to determine the quality of the ham (SM) from loin (LTL) measurements. Intermuscular colour variation was assessed using surface measurements, which avoided any destruction of musculature tissue.…”

Section: Results and Discussion Study 1 Intermuscular Variation (Ltl mentioning

confidence: 99%

Evaluation of inherent variation in porcine M. thoracis et lumborum and M. semimembranosus

et al. 2005

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Variation in quality traits may occur between the different muscles within a carcass and also within a muscle. This study examined inter-and intramuscular variation and the resulting effect on measurements (pH, conductivity and colour) taken within 24 h post mortem. The effect of shackling on these quality prediction measurements was also determined. Finally the inherent variability of quality attributes within porcine M. longissimus thoracis et lumborum (LTL) was examined at 4 days post mortem. Significant intermuscular variation was detected at 24 h post mortem, with higher pH and conductivity values recorded in the M. semimembranosus (SM) than in the LTL. pH and conductivity measurements in both muscle types were correlated (r = 0.46-0.88, P < 0.05) at 45 min and 3 h post mortem. CIE L * and a * values, % reflectance and Japanese pork colour scores were significantly (P < 0.001) different in the neck region (M. biventer cervicis and M. splenius) than on the surface of the SM and M. gluteus medius. An intramuscular effect was not observed in either SM or LTL muscles. Shackling did not introduce a significant variation between sides for pH, conductivity and colour measurements taken up to 24 h post mortem. At 4 days post mortem it was determined that the water-holding capacity, tenderness (Warner-Bratzler Shear force) and composition of the LTL are not dependent on sampling location within the muscle. These results suggest that meat quality measurements are uniform throughout the LTL (loin) and that a significant relationship exists between the LTL and SM muscles.

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The measurement of light scattering and electrical conductivity for the prediction of PSE pig meat at various times post mortem

Cited by 44 publications

References 6 publications

Predicting survival of western rock lobstersPanulirus cygnususing discriminant analysis of haemolymph parameters taken immediately following simulated handling treatments

Predicting survival of western rock lobstersPanulirus cygnususing discriminant analysis of haemolymph parameters taken immediately following simulated handling treatments

Pig sire type and sex effects on carcass traits, meat quality and physicochemical and sensory characteristics of Serrano dry‐cured ham

Evaluation of inherent variation in porcine M. thoracis et lumborum and M. semimembranosus

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