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Retrospective by sex of the new EU lean meat content of pig carcasses

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Gérard Daumas, 69th Annual meeting of the european federation of animal science (EAAP), Dubrovnik, Croatie, 27-31 août 2018, poster

A new EU regulation on carcass classification applies from July 2018. This regulation changes the definition of the reference lean meat percentage (LMP) which becomes the LMP in the carcass (from total dissection). Nevertheless, each Member State can choose when he will update its grading methods. The aim of this work is to simulate this change on the last 5 years in France for each sex.
Conversely to most of European countries sex is registered online in France during pig classification. Statistics per sex are regularly published by the regional classification organisations.
The production of entire males started in France in 2013 (13% of the males), increased quickly and is now stable (27% of the males in 2017), around 2.5 million a year. More than 95% of entire males are classified with the classification method CSB Image-Meater® (IM) approved by the EU in 2013. The present LMP prediction equation contains two fat depths (G3 and G4) and two muscle depths (M3 and M4).
A sample of 180 pigs was uniformly stratified on sex: 60 entire males, 60 females and 60 castrated males. All cuts were CT scanned allowing to calculate the LMP. Prediction equation was calculated by a general linear model including the 4 depths as well as the interactions with sex. The stepwise procedure by using BIC selected a model with 1 fat depth (G3) and 2 muscle depths (M3 and M4), G3 and M3 coefficients depending on sex. The RMSE was 2.15. Removal of M4 only decreased the RMSE of 0.01. The fat coefficient of entire males was more than twice that of females, while that of castrates was in the middle. Differences on M3 coefficient had lower impact on LMP.
The equation was applied on the annual classification averages from 2013 to 2017. In 4 years LMP increased, but differently according to sex: +0.11 for entire males, +0.25 for females and +0.34 for castrated males. In the same period the difference between entire and castrated males decreased from 4.02 to 3.79, while the difference between entire males and females decreased from 1.37 to 1.24.
When the Image-Meater method will be updated, it seems worthwhile to consider separate slopes for entire males, females and castrated males.

PDF icon Gérard Daumas, 69th EAAP, Dubrovnik, Croatie, 27-31 août 2018, abstract, PDF icon Gérard Daumas, 69th EAAP, Dubrovnik, Croatie, 27-31 août 2018, poster
2018

Découpe virtuelle des carcasses de porc

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Mathieu Monziols, bilan 2017, éditions IFIP, mai 2018, p. 38

Le marché de la viande de porc est séparé aujourd’hui entre la filière amont qui est rémunérée à la carcasse à l’abattoir et la filière aval qui achète désormais majoritairement des pièces aux abattoirs. Les 4 pièces principales n’ont pas la même valeur économique et leurs critères de qualité basés sur la composition corporelle sont différents. Afin d’avancer sur la composition corporelle des pièces de découpe industrielle, il est nécessaire d’obtenir des données précises de cette composition. Le tomographe à rayons X ou scanner RX a démontré sa capacité à mesurer la composition corporelle avec une précision proche de celle de la dissection (IFIP, Daumas et Monziols, 2011). L’étude avait pour objectif d’essayer de s’affranchir de la découpe lors d’une mesure de composition de pièce au scanner. Il s’agissait donc de réaliser une découpe dite « virtuelle ».

PDF icon Mathieu Monziols, bilan 2017, éditions IFIP, mai 2018, p. 38, fiche n° 10
2018

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

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
le porc dans tous ses états

Journée d'échanges de l'Ifip "le porc dans tous ses états"

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L’IFIP EXPOSE LE PORC le 9 décembre 2014 de 9h30 à 16h35 à Paris (Espace du Centenaire-Maison de la RATP, Paris 12)
Venez participer à une journée d’échanges autour des activités de l’Ifip …

Entrée gratuite sur inscription
Formulaire d’inscription en ligne : http://www.ifip.asso.fr/fr/journee_echanges_ifip
Répondre avant le 28 novembre 2014 à IFIP-Institut du porc - 5 rue Lespagnol - 75020 Paris
Contact : juliette.baron@ifip.asso.fr - tél : 01 58 39 39 50 - Fax : 01 58 39 35 69
 

 

PDF icon Programme de la journée d'échanges Ifip du 9 décembre 2014
2014

Imagerie Scanner : L'Ifip dans le bain technologique

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En organisant les FanI Days, deux journées internationales sur l'imagerie des animaux d'élevage, l'Ifip prépare un bond technologique. Enjeux.
2010

Detection of invariant structures and selection of representative MRI slices of pig lean meat percentage

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Tomography techniques are well suited to determine carcass composition. Nevertheless, sometimes some practical constraints appear like: too time consuming, too costly, only joints are available. In these cases scanning some representative slices is a suited alternative.

This study aimed at firstly detecting some invariants to register images and secondly at selecting batches of contiguous slices for assessing the lean meat percentage of slaughterpigs.
PDF icon Detection of invariant structures and selection of representative MRI slices of pig lean meat percentage
2010