Bovine demodicosis : leather from the raw material to the finished product / Mukhtar Taha Abu-Samra in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 2 (03-04/2015)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 2 (03-04/2015) . - p. 80-90 Titre : Bovine demodicosis : leather from the raw material to the finished product Type de document : texte imprimé Auteurs : Mukhtar Taha Abu-Samra, Auteur ; Yassir Adam Shuaib, Auteur Année de publication : 2015 Article en page(s) : p. 80-90 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Analyse Cuirs et peaux de bovins Démodécie Parasitoses Peau -- Maladies chez les animaux Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Demodex bovis mites and associated bacteria produced lesions ranging from 25 to 3618 per hide. Infected hides were compared to non-infected ones, from the raw material to the finished product. Infected hides showed the following defects: (1) Severely infected hides were green-graded as rejects. (2) The curing time was longer than non-infected ones. (3) The rate of water absorption was reduced by more than 50% (4) Liming resulted in dark blue precipitate on the lesions due to uneven distribution of the sulphide. (5) Scudding was very difficult. (6) Deliming and pickling resulted in circuler white blemishes on the grain surface. (7) Slipping-off of the grain surface over severely infected areas. (8) The degree of plumping was only 12-22%. (9) Splitting was very difficult, and when split, holes and cavities were evident. (10) Shaving resulted in detachment of all the lesions on the flash side leaving numerous pits and holes. (11) The aesthetic appeal and cutting areas of the leather were markedly reduced. (12) Severely infected hides were difficult to finish, required more effort in buffing and utilized more dye without producing a drastic improvement in acceptability, and the grain surface was unsightly, uneven, full of elevations and depressions. Leather sections revealed ragged cavities with no definite boundaries. The fibres round those cavities were distorted, thinner than normal and compressed. The grain of the leather showed many small shallow depressions and separation of the grain surface from the corium in areas with large lesions. Severely affected leather showed complete damage and distortion of bath the grain surface and corium. Bovine demodicosis infected hides resulted in a significant reduction at (p<0.01) in the cure-index, tensile strength, tearing load, percentage elongation, correlation coefficient of tensile strength versus tearing load, apparent density, flexing endurance, distension at grain crack, hide substance, moisture, fat and ash contents compared to non-infected ones. However, the distension at grain burst of infected specimens showed a significant reduction at (p<0.05) over non-infected ones. The deleterious effects of bovine demodicosis revealed in this study ; would definitely culminate in serious economic losses in the national economy of the Sudan. The government, veterinarians and research workers should devote more time to the prevention and control of the disease. They should create awareness of the cattle owners regarding the damaging effects of demodectic mange in the quallty of cattle hides, animal health and production. Tanneries should avoid selecting infected bides, involving unnecessary expenditure on the production of otherwise reject finished product because the deleterious effects of this disease persists in any leather goods manufactured from the leather produced. Note de contenu : - MATERIALS AND METHODS : Animals - Laboratory investigations - Preparation of crust leather - Physical tests of crust leather - Chemical analysis of crust leather - Statistical analysis - RESULTS : Findings recorded during the preparation of crust leather - Microscopic examination of crust leather - Physical testing and chemical analysis of crust leather En ligne : https://drive.google.com/file/d/1AvBEdjQ-mMyMPNZpdCzY4-WsK4rfGKY8/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23744 [article]

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