Reliability of visible reflectance spectroscopy in discriminating between pasture and stall-fed lambs from thin and fat-tailed sheep breeds in dry and hot environment
Considering the additional market value of pasture meat, many authentication methods were developed to discriminate it from meat produced in conventional systems. The visible reflectance spectroscopy technique has proved its efficiency under European conditions and breeds. The present study tested t...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2019-01-01
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| Series: | Animal |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1751731119000909 |
| _version_ | 1818642458199719936 |
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| author | H. Hajji S. Prache D. Andueza S. Smeti M. Mahouachi N. Atti |
| author_facet | H. Hajji S. Prache D. Andueza S. Smeti M. Mahouachi N. Atti |
| author_sort | H. Hajji |
| collection | DOAJ |
| description | Considering the additional market value of pasture meat, many authentication methods were developed to discriminate it from meat produced in conventional systems. The visible reflectance spectroscopy technique has proved its efficiency under European conditions and breeds. The present study tested the reliability of this method to discriminate between pasture-fed (P) and stall-fed (S) lambs under North African conditions and investigated the effect of feeding system (FS) (P v. S) and breed (Barbarine; Queue Fine de l’Ouest; and Noire de Thibar) on weight and colour of perirenal, subcutaneous and caudal fat. A total of 18 P and 18 S lambs were used with 6 P and 6 S lambs for each breed. The colour and the reflectance spectrum of different fat tissues were measured. The FS affected weights of all fat tissues and all colour parameters of perirenal and subcutaneous fat (P ≤ 0.01); it almost affected redness and yellowness of caudal fat (P ≤ 0.05; P ≤ 0.01). In all adipose tissues, lightness was higher and both redness and yellowness were lower for S lambs than P lambs. The breed affected weight, lightness and redness of perirenal fat and weight and redness of subcutaneous fat with significant interaction with FS for subcutaneous fat data. To discriminate P lambs from S lambs, the reflectance spectrum of perirenal, subcutaneous and caudal fat at wavelengths between 450 and 510 nm (Method 1, M1) or at wavelengths between 400 and 700 nm using partial least squares discriminative analysis as a classification method (Method 2, M2) were used. M2 yielded to a higher proportion of correctly classified lambs compared with M1 (P = 0.001). The proportion of correctly classified lambs using M2 was 76.4, 75.0 and 80.0% for perirenal, subcutaneous and caudal fat for P lambs and 83.3, 76.4 and 100.0% for S lambs. Despite lower reliability in comparisons to European researches, this study confirmed the efficiency of visible reflectance spectroscopy technique applied on perirenal fat in feeding systems authentication under North African conditions and spotted the caudal fat as a new support for better classification of fat-tailed breeds. |
| first_indexed | 2024-12-16T23:43:23Z |
| format | Article |
| id | doaj.art-07bfa84ef6fc4a5186b36a3e5ccb382e |
| institution | Directory Open Access Journal |
| issn | 1751-7311 |
| language | English |
| last_indexed | 2024-12-16T23:43:23Z |
| publishDate | 2019-01-01 |
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| series | Animal |
| spelling | doaj.art-07bfa84ef6fc4a5186b36a3e5ccb382e2022-12-21T22:11:33ZengElsevierAnimal1751-73112019-01-01131126692678Reliability of visible reflectance spectroscopy in discriminating between pasture and stall-fed lambs from thin and fat-tailed sheep breeds in dry and hot environmentH. Hajji0S. Prache1D. Andueza2S. Smeti3M. Mahouachi4N. Atti5Institut des régions Arides, IRA-Mednine, Laboratoire d’élevage et de la faune sauvage, Route du Djorf Km 22.5, 4100 Mednine, Tunisia; University of Carthage, INRA-Tunisie, Laboratoire de Productions Animales et Fourragères, rue Hédi Karray, 2049 Ariana, TunisiaInstitut National de la Recherche Agronomique, INRA, UMR1213 Herbivores, F-63122 Saint-Genès-Champanelle, FranceInstitut National de la Recherche Agronomique, INRA, UMR1213 Herbivores, F-63122 Saint-Genès-Champanelle, FranceUniversity of Carthage, INRA-Tunisie, Laboratoire de Productions Animales et Fourragères, rue Hédi Karray, 2049 Ariana, TunisiaUniversity of Jendouba, ESAK, Route de Dahmani-Boulifa 7100 Le Kef, TunisiaUniversity of Carthage, INRA-Tunisie, Laboratoire de Productions Animales et Fourragères, rue Hédi Karray, 2049 Ariana, TunisiaConsidering the additional market value of pasture meat, many authentication methods were developed to discriminate it from meat produced in conventional systems. The visible reflectance spectroscopy technique has proved its efficiency under European conditions and breeds. The present study tested the reliability of this method to discriminate between pasture-fed (P) and stall-fed (S) lambs under North African conditions and investigated the effect of feeding system (FS) (P v. S) and breed (Barbarine; Queue Fine de l’Ouest; and Noire de Thibar) on weight and colour of perirenal, subcutaneous and caudal fat. A total of 18 P and 18 S lambs were used with 6 P and 6 S lambs for each breed. The colour and the reflectance spectrum of different fat tissues were measured. The FS affected weights of all fat tissues and all colour parameters of perirenal and subcutaneous fat (P ≤ 0.01); it almost affected redness and yellowness of caudal fat (P ≤ 0.05; P ≤ 0.01). In all adipose tissues, lightness was higher and both redness and yellowness were lower for S lambs than P lambs. The breed affected weight, lightness and redness of perirenal fat and weight and redness of subcutaneous fat with significant interaction with FS for subcutaneous fat data. To discriminate P lambs from S lambs, the reflectance spectrum of perirenal, subcutaneous and caudal fat at wavelengths between 450 and 510 nm (Method 1, M1) or at wavelengths between 400 and 700 nm using partial least squares discriminative analysis as a classification method (Method 2, M2) were used. M2 yielded to a higher proportion of correctly classified lambs compared with M1 (P = 0.001). The proportion of correctly classified lambs using M2 was 76.4, 75.0 and 80.0% for perirenal, subcutaneous and caudal fat for P lambs and 83.3, 76.4 and 100.0% for S lambs. Despite lower reliability in comparisons to European researches, this study confirmed the efficiency of visible reflectance spectroscopy technique applied on perirenal fat in feeding systems authentication under North African conditions and spotted the caudal fat as a new support for better classification of fat-tailed breeds.http://www.sciencedirect.com/science/article/pii/S1751731119000909fat colourfeedingauthenticationtraceabilitysheep |
| spellingShingle | H. Hajji S. Prache D. Andueza S. Smeti M. Mahouachi N. Atti Reliability of visible reflectance spectroscopy in discriminating between pasture and stall-fed lambs from thin and fat-tailed sheep breeds in dry and hot environment Animal fat colour feeding authentication traceability sheep |
| title | Reliability of visible reflectance spectroscopy in discriminating between pasture and stall-fed lambs from thin and fat-tailed sheep breeds in dry and hot environment |
| title_full | Reliability of visible reflectance spectroscopy in discriminating between pasture and stall-fed lambs from thin and fat-tailed sheep breeds in dry and hot environment |
| title_fullStr | Reliability of visible reflectance spectroscopy in discriminating between pasture and stall-fed lambs from thin and fat-tailed sheep breeds in dry and hot environment |
| title_full_unstemmed | Reliability of visible reflectance spectroscopy in discriminating between pasture and stall-fed lambs from thin and fat-tailed sheep breeds in dry and hot environment |
| title_short | Reliability of visible reflectance spectroscopy in discriminating between pasture and stall-fed lambs from thin and fat-tailed sheep breeds in dry and hot environment |
| title_sort | reliability of visible reflectance spectroscopy in discriminating between pasture and stall fed lambs from thin and fat tailed sheep breeds in dry and hot environment |
| topic | fat colour feeding authentication traceability sheep |
| url | http://www.sciencedirect.com/science/article/pii/S1751731119000909 |
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