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Biais par sexe et génotype halothane dans l’estimation par visionique du pourcentage de muscle des pièces de découpe

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Poster présenté par Gérard Daumas et Mathieu Monziols, aux 50es Journées de la Recherche Porcine, 2018, 6 et 7 février 2018, Paris

L’industrie de la viande s’intéresse à la prédiction des rendements des pièces afin d’orienter la découpe aussi efficacement que possible.
Ces rendements peuvent être prédits par les variables utilisées pour la pesée et le classement des carcasses. Cependant, les facteurs ayant un effet sur la composition des carcasses peuvent avoir un effet différent sur celle des pièces et spécifique à chaque pièce. Ce travail vise à quantifier les biais par sexe et génotype halothane dans l’estimation de la composition des pièces par le système automatique de vision utilisé pour le classement des carcasses.

PDF icon Poster de Gérard Daumas et Mathieu Monziols, 50es JRP, 6 et 7 février 2018, Paris
2018

Biais par sexe et génotype halothane dans l’estimation par visionique du pourcentage de muscle des pièces de découpe

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50es Journées de la Recherche Porcine, 6 et 7 février 2018, Paris, p. 97-98, par Gérard Daumas et Mathieu Monziols, poster

Poster.

L'industrie de la viande s'intéresse à la prédiction des rendements des pièces afin d’orienter la découpe aussi efficacement que possible. Les données de la classification obligatoire des porcs dans l'Union européenne (UE) permettent cette prédiction. L'automatisation de la classification des porcs est en expansion, concernant désormais environ la moitié de l’abattage européen. La technologie de la vision a été choisie par la France en particulier.
Le sexe et le gène halothane, facteurs bien connus pour leurs effets sur la composition de la carcasse, ne sont pas inclus dans les équations actuellement autorisées par l'UE pour la classification des carcasses (Font-i-Furnols et al., 2016). Par conséquent, les équations de prédiction du pourcentage de viande maigre dans la carcasse et dans les pièces pâtissent d’écarts systématiques pour ces sous-populations. L'objectif de cet article est de quantifier ces écarts dans l'estimation par la vision automatique de la composition des pièces de porc. Dans le cas où ils seraient considérés comme importants, la prise en compte du sexe et du gène halothane pourrait alors être discutée.

Sex and halothane genotype biases in machine vision estimates of the muscle percentage of pork cuts

The pork industry often guides carcass cutting by using the carcass classification results. Nevertheless, two important factors of carcass composition sex and halothane status  are not included in the prediction equations of lean meat percentage (LMP), as authorised by the European Union (EU). Systematic deviations are thus expected. This work quantified systematic deviations by sex and halothane genotype subpopulations in machine vision estimates of pork cut composition. A sample of 250 carcasses, stratified by sex (50% castrated males and 50% females), was measured on line by the automatic vision classification method used in France. An ear sample was taken to analyse the halothane genotype (Hal): normal (NN), heterozygote (Nn) or sensitive (nn). Left sides of carcasses were cut according to the EU procedure. The four main cuts were scanned by X-ray tomography to determine their LMPs, which were then estimated via regression using six potential predictors from the automatic vision system and carcass weight. Systematic deviations were calculated for each regression by sex and Hal genotype as the mean difference between fitted and observed values. Absolute deviations by sex were lowest (0.5%) in hams and highest (1.4%) in bellies. Deviations by Hal genotype were lowest (0.3%) in shoulders and highest (0.8%) in bellies. In all models, LMPs of females and Hal Nn were underestimated, while those of castrates and Hal NN were overestimated. The deviations’ sizes by Hal genotype were about half that of those by sex. Deviations by sex could be removed by using a different intercept in the prediction equations.

PDF icon Gérard Daumas et Mathieu Monziols, 50es JRP, 6 et 7 février 2019, Paris, p. 97-98, poster
2018

Conséquences de l'autormatisation du classement des carcasses sur les biais par type sexuel et génotype halothane

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Gérard Daumas et al., 49es Journées de la Recherche Porcine, Paris, 31 janvier et 1er février 2017, p. 53-54, poster

Le classement des carcasses de porcs définit une norme contractuelle servant de base au paiement des éleveurs. Jusqu’à la mi-2013, les porcs étaient classés par la méthode CGM, du nom de l’appareil semi-automatique manié par un opérateur prenant des mesures dorsales. Depuis, les porcs des grands abattoirs de la zone Uniporc Ouest sont classés par la méthode Image-Meater, du nom de l’appareil automatique de vision prenant des mesures à la jonction entre longe et jambon. L’automatisation du classement des carcasses s’est ainsi accompagnée d’un changement de localisation des épaisseurs mesurées. Les écarts entre sous-populations, dont la connaissance est d’un grand intérêt dans la filière, ont donc été modifiés. L’objectif de ce travail était de quantifier ces écarts entre types sexuels et génotypes halothane, facteurs connus pour leur importance sur la composition corporelle, pour les méthodes de classement CGM et Image-Meater (I-M). Pour cela, la tomographie RX a été préférée à la dissection, compte tenu de ses nombreux avantages. Le taux de muscle des pièces (TMP) mesuré par scanner selon la procédure IFIP (TMPrx) s’est avéré très proche du TMP mesuré par dissection (Daumas et Monziols, 2016).

ENG

Consequences of automation of carcass classification on differences between sexual types and halothane genotypes

The automation of carcass classification was accompanied by a change in the location of thickness measurements. Biases by subpopulation, which the sector is very interested in knowing, have therefore been changed. The objective of this study was to quantify these biases related to sexual type and halothane genotype, known for their importance on body composition, for the classification methods CGM and CSB Image-Meater (I-M). A sample of 209 carcasses was measured by both methods in three slaughterhouses. The next day, the carcasses were cut according to the standardized European method. The four main cuts were weighed and scanned by X-Ray tomography. The weight of muscle and TMP (lean meat % in the four main cuts) were calculated after thresholding images. Each cell of the factorial design (Females-Castrates; Nn-NN) brought together about 50 carcasses. For each method, the adjusted means of sex and halothane modalities were calculated by analysis of covariance including fat and muscle thicknesses as well as interactions. No interaction was significant. The difference between adjusted means by sex increased from 1.0% with CGM to 1.8% with I-M. This difference between Hal genotypes, not significant with CGM, rose to 1.3%. Systematic deviations for sexual types could be cancelled by a differentiated intercept in the prediction equation. Deviations for halothane genotypes could be reduced by including a prediction of halothane status in the equation. These deviations could also be managed at commercial level.

PDF icon Gérard Daumas et al., 49es Journées de la Recherche Porcine, Paris, 31 janvier et 1er février 2017, p. 53-54, poster
2017

Pork cuts composition measured by scanner as influenced by sex and halothane genotype

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Gérard Daumas et Mathieu Monziols, 63e International Congress of Meat Science and Technology, Cork, Irlande, 13-18 août 2017, p. 54-55

The aim of this study was to quantify the main effects influencing the tissue composition measured by computed tomography (CT) of pork cuts. A representative sample of the French pig slaughtering was selected in three abattoirs and stratified according to sex (50% castrated males and 50% females). An ear sample was analysed for Halothane gene (Hal). The left sides were cut according to the EU procedure and the four main cuts were CT scanned. Images were thresholded in order to determine muscle, fat and bone weight. Sex and Hal effects on tissues proportions were analysed by variance analysis. Interaction between sec and >Hal was never significant. Sex was significant on all the tissues proportions in the cuts, except the bone % in ham and loin. Hal was significant on all the tissueds proportions in the cuts, except the fat % in shoulder and the bone % in belly. Sex had a major effect (1 standard deviaiton) on the muscle % in the loin and the fat % in the shoulder. The important effects of sex and Hal on pork cuts composition should be taken into account by pork industry for sorting cuts and carcasses and for selecting suppliers.

PDF icon Gérard Daumas et Mathieu Monziols, 63e ICOMST, Cork, Irlande, 13-18 août 2017, p.
2017

Estimation by vision of pork cuts composition for sex and halothane genotype subpopulations

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Gérard Daumas et Mathieu Monziols, 63e International Congress of Meat Science and Technology, Cork, Irlande, 13-18 août 2017, p. 52-53

This work aims to quantify the systematic deviations for sex and halothane genotype subpopulations in the estimation by automatic vision of pork cuts composition. A sample of 208 carcasses, startified according to sex (50% castrated males and 50% females), was measured on line by the classification method CSB Image-Meater® (IM). An ear sample was analysed for halothane gene (Hal). The left sides were cut according to the EU procedure and the four main cuts were CT scanned  in order to determine the lean meat percentage (LMP) in each cut. These LMPs were regressed on six IM potential predictors and the carcass weight. For each equation were calculated the systematic deviations per level of the sex and Hal factors by mean difference between predicted and observed values. The absolute deviation per sexual types was the lowest (0.5%) in ham and the highest (1.4%) in belly. The deviations per Hal genotype ranged from 0.3% in shoulder to 0.8% in belly. In all models females and Hal heterozygotes were underestimated and vice-versa. The deviations per Hal genotype were about the half than per sex. The deviations per sex could be removed by at least a different intercept in the prediction equations.

PDF icon Gérard Daumas et Mathieu Monziols, 63e ICOMST, Cork, Irlande, 13-18 août 2017, p.
2017

Vision versus reflectance technology for deviations for sex and halothane genotype in pig carcass classification

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Gérard Daumas et al. 63e International Congress of Meat Science and Technology, Cork, Irlande, 13-18 août 2017, p. 50-51

This work aims to compare the systematic deviations for sex and halothane genotype subpopulations between pig classification methods by automatic vision and semi-automatic relfectance. A sample of 209 carcasses, stratified according to sex (50% castrated males and 50% females), was measured by CSB Image-Meater® (IM) and CGM. An car sample was analysed for halothane gene (Hal). The left sides were cut according to the EU procedure and the four main cuts were weighed and scanned by X-ray tomography in order to detemrine lean meat percentage (LMP). For each device the LMP was regressed on the fat and muscle depths included in the official equations. For each equation were calculated the systematic deviations per level of the sex and Hal factors by mean difference between predicted and observed values. The LMP overestimation for castrated males increased from 0.4% with CGM to 0.7% with IM. The LMP overestimation for non-sensitive homosygotes Hal, not significant with CGM, rose to 0.5%. Systematic deviations for sexual types could be cancelled at least by a differentiated offset in the prediction equation.

PDF icon Gérard Daumas et al. 63e ICOMST, Cork, Irlande, 13-18 août 2017, p. 50-51
2017

Conséquences de l’automatisation du classement des carcasses sur les écarts entre types sexuels et génotypes halothane

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Gérard Daumas et  al., 49es Journées de la Recherche Porcine, Paris, 31 janvier et 1er février 2017, poster

L’automatisation du classement des carcasses à la mi-2013 s’est accompagnée d’un changement de localisation des épaisseurs mesurées.
Les épaisseurs mesurées sur le dos, latéralement à la fente, ont laissé place à des épaisseurs mesurées à la jonction jambon-longe, sur la fente.
Les écarts entre sous-populations, dont la connaissance est d’un grand intérêt dans la fi lière, ont donc été modifi és. L’objectif de ce travail était de quantifier, pour les méthodes de classement CGM et CSB Image-Meater® (I-M), ces écarts entre types sexuels et génotypes halothane, facteurs connus pour leur importance sur la composition corporelle.

PDF icon Gérard Daumas et al., 49es JRP, Paris, 31 janvier et 1er février 2017, poster
2017

Vision versus reflectance technology for deviations for sex and halothane genotypes in pig carcass classification

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Gérard Dumas et Mathieu Monziols, 63e International Congress of Meat Science and Technology, Cork, Irlande, 13-18 août 2017, poster

Automation of pig carcass classification entailed a change in the location of the measured variables. Since mid-2013 in France the thicknesses measured on the back, laterally to the splitline, were replaced by thicknesses measured at the ham-loin junction on the splitline. Systematic deviations by sub-population, whose knowledge is of great interest in the chain, have thus been modified. The objective of this work was to quantify the systematic deviations related to sex and halothane genotype factors for CGM and CSB Image-Meater® classification methods, well known for their effects on carcass composition.

PDF icon Gérard Dumas et Mathieu Monziols, 63e ICOMST, Irlande, 13-18 août 2017, pos
2017

Pork cuts composition measured by scanner as infl uenced by sex and halothane genotype

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Gérard Dumas et Mathieu Monziols, 63e International Congress of Meat Science and Technology, Cork, Irlande, 13-18 août 2017, poster

Knowledge of the main factors infl uencing the cuts composition can help both sorting cuts and designing composition experiments. Sex and
halothane gene, well known for their effects on carcass composition, also deserve to be studied on cuts. The aim of this work is to study the sex
and halothane gene effects on the proportions of tissues in the four main pork cuts: ham, shoulder, loin and belly. Composition was determined by
scanner, a modern technique, which has recently been intensively studied in the COST action FAIM (Farm Animal Imaging).

PDF icon Gérard Dumas et Mathieu Monziols, 63e ICOMST, Cork, Irlande, 13-18 août 2017, pos
2017

Estimation by vision of pork cuts composition for sex and halothane genotype subpopulations

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Gérard Dumas et Mathieu Monziols, 63e International Congress of Meat Science and Technology, Cork, Irlande, 13-18 août 2017, poster

The meat industry is interested in the prediction of the cut yields in order to drive the cutting as effi ciently as possible. These yields can be predicted
with the variables used in the compulsory task of carcass weighing and grading. Nevertheless, the factors having an effect on carcass grading could
have a different effect on the cut grading, specifi c to each cut. This work aims to quantify the systematic deviations for sex and halothane genotype
subpopulations in the estimation of pork cuts composition by the automatic vision system called CSB Image-Meater® .

PDF icon Gérard Dumas et Mathieu Monziols, 63e ICOMST, Cork, Irlande, 13-18 août 2017, pos
2017

Effects of halothane genotype and pre-slaughter treatment on pig meat quality. Part 2. Physico-chemical traits of cured-cooked ham and sensory traits of cured-cooked and dry-cured hams

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Meat science (GBR), 2002, V 62, n° 4, décembre, p.439-446, 8 p., en anglais, par Fernandez X et al.

Effets du génotype halothane et de traitement pré-abattage sur la qualité de la viande de porc. Partie 2 : caractéristiques physico-chimiques du jambon cuit et caractéristiques sensorielles des jambons cuit et sec

ABSTRACT

Forty-eight castrated F2 offspring of Piétrain and Large White pigs were allocated to a 3×2 factorial design in order to study the interactive effect of halothane genotype (NN, Nn and nn) and pre-slaughter treatment (referred to as ’Experimental’ (EXP) and ’Commercial-like’ (COL) conditions; the latter involving short transportation, mixing unfamiliar pigs and slaughtering shortly after transport) on the qualities of cured-cooked and dry-cured hams. At 24 h post mortem, the hams were collected and assigned to cured-cooked (right ham) and dry-cured (left ham) ham processing. A sample of M. semimembranosus (SM) was collected before cooked ham processing, was used for chemical composition analysis, cured and then cooked at various temperatures. Cooking losses and compression tests were carried out after cooking on these SM samples. The water and collagen content of SM muscle was significantly higher in nn pigs compared with the two other genotypes. At all cooking temperatures (60, 65 and 70 °C), SM muscles from nn pigs showed higher cooking losses and instrumentally assessed toughness than the other genotypes, the heterozygous pigs being intermediate. The technological yield of cured-cooked ham processing was lower in nn, compared with NN and Nn animals. Cooked hams from nn pigs were drier, tougher, stringier and less smooth than NN and Nn pigs. The heterozygous pigs were similar to normal pigs for all texture characteristics with the exception of toughness for which they got a significantly higher score than NN pigs. The pigs slaughtered under the COL conditions had a better slice cohesiveness and a significantly lower dryness, than pigs slaughtered under the EXP conditions. The effect of HAL genotype on slice cohesiveness was significant only when pigs were slaughtered under the EXP conditions. Dry-cured hams from nn pigs showed significantly more visual defects, but were less tough, smoother and more fondant (softer) than NN and Nn pigs. The dry-cured hams from pigs slaughtered under the COL conditions had a better cohesiveness between muscles and a more intense yellow colour of fat than those from pigs slaughtered under the EXP conditions. COL pigs were also judged significantly less tough, smoother and more fondant than EXP ones. Overall, the effects of pre-slaughter treatment were small compared with those of the HAL genotype. The effects of HAL genotype on the sensory traits of cured-cooked ham were similar to those reported for fresh meat. However, the good textural characteristics of dry-cured ham processed from HAL positive pigs are somewhat surprising and need to be confirmed.

2002