Structure of skin in collagenous fibres : crossbreeds from black-and-white-cows X bulls of beef breeds / Piotr Zapletal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 6 (11-12/2001)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 85, N° 6 (11-12/2001) . - p. 207-210 Titre : Structure of skin in collagenous fibres : crossbreeds from black-and-white-cows X bulls of beef breeds Type de document : texte imprimé Auteurs : Piotr Zapletal, Auteur ; J. Szarek, Auteur ; A. Weglarz, Auteur Année de publication : 2001 Article en page(s) : p. 207-210 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bovins -- Races Collagène -- Analyse Croisement de races Cuirs et peaux de bovins Peau -- analyse Peau -- Histologie Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The aim of this study was to define the effect of crossing Black-and-White (CB) cattle with Italian beet' breeds (Piemontese-P. Marchigiana-M and Chianina-.Ch) and with Aberdeen Angus (AA) breed as well as that of pure Black-and—White breed with AA and Simmental (S) bulls, on the histological structure of skin tissue and properties of the collagen fibres. Knowledge of the arrangement and structure of' collagen fibres of the studied skins may be helpful in choosing the correct technological process for their dressing, or in developing a new one which would result in a better utilisation of raw material. It can be stated that analysis of’ photographs of skin tissue under scanning electron microscopy (SEM) corresponds with the results of fibre measurements conducted under a light microscope. Skin tissue of bulls (CB x P) x AA and CB x AA showed the smallest spacing between the bundles of collagen fibres. The largest number of fibres in a bundle was contained in the skins of crossbreeds (CB x M) x AA and (CB x P) x AA. In contrast. the skins of S and (CB x Ch) x AA. crossbreeds (CB x M) x AA and (CB x P) x AA were characterised by a largest number of fine fibres in a bundle. Based on an organoleptic assessment the latter skin tissue displayed higher fineness and softness as well as better elasticity. The thickness of the collagen fibres was relatively greater in the skins of those breed groups. which were characterised by a smaller number of fibres in a bundle. A high content of collagen in the skin of Simmental and CB x S bulls is indicative of its extended structure and denser network. Note de contenu : - Table 1 : Selected parameters of skin histological structure - Table 2 : Selected parameters of skins ultrastruktural structure (scanning microscope) En ligne : https://drive.google.com/file/d/14rMlnaSUXfvi5a20zck_Strc8pn1HjBR/view?usp=drive [...] Format de la ressource électronique : pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40215 [article]

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The vertical fiber hide defect : Transmission to progeny and relation to reproductive failures in crossbreding test / A. L. Everett in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXIII (Année 1978)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXIII (Année 1978) . - p. 458-470 Titre : The vertical fiber hide defect : Transmission to progeny and relation to reproductive failures in crossbreding test Type de document : texte imprimé Auteurs : A. L. Everett, Auteur ; Mary V. Hannigan, Auteur Année de publication : 1978 Article en page(s) : p. 458-470 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bovins -- Races Croisement de races Cuirs et peaux -- Analyse Cuirs et peaux -- Défaut de fibre verticale Cuirs et peaux -- Défauts Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Studies over the past 20 years have shown that the vertical fiber bide defect, which causes moderate to extreme weakness in leather, occurs much more frequently in Herefords than in the other two major cattle breeds examined so far. Evidence from several tests, including a recent hide biopsy study of twin Hereford and Holstein cows, supports the theory that this defect is a genetically controlled trait. We have now extended the biopsy study to include 76 progeny of these same cows, produced by reciprocal crossbreeding through three calvings, to test the incidence of the defect in known crossbreds. Although 13 of the Hereford dams and one of the Hereford sires carried the defect, only one of the calves was found to be defective. Samples were not available from three of the eight sires. Apparently the defect does not commonly occur from this type of crossbreeding. Analysis of the calving records from the crossbreeding test revealed preliminary evidence which, if confirmed by further testing on a larger scale, may have serious economic implications to the beef cattle industry. The Holstein cows produced a live calf crop of 86 percent of expected pregnancies and the normal Herefords produced 90 percent. However, the 13 defective Herefords produced only 70 percent and the five with extreme defect only 53 percent. Most of the Hereford failures were due to stillborn calves, especially from one pair of defective twins. Note de contenu : - EXPERIMENTAL : Test design - Biopsy procedure - Histology - Test hides and leather - RESULTS : Biopsy results for progeny - Analysis of calving records - Analysis of calving records - Incidence of calving failures - Pathological abnormalities - Table 1 : Evaluation of fiber structure in selected progeny of hereford cows with defect - Table 2 : Evaluation of fiber structure in selected progeny of hereford cow without defect - Table 3 : Evaluation of fiber structure in selected progeny of Holstein cows without defect - Table 4 : Calving records of hereford cows with defect - Table 5 : Calving records of hereford cows without defect - Table 6 : Calving records of Holstein cows without defect - Table 7 : Summary of reproductive performance data - Table 8 : Incidence of failures by breed, fiber, and feed groups En ligne : https://drive.google.com/file/d/1Tb6WU2S8hgp8eUAkNGSlZA3KqCc_1ueb/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41161 [article]

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