[article]
| Titre : |
The influence of compensatory growth on certain hide and leather characteristics. Part II. Hide and leather yield and leather physical characteristics |
| Type de document : |
texte imprimé |
| Auteurs : |
Alan E. Russell, Auteur ; S. Pinchuck, Auteur ; J. E. Bruyn, Auteur ; R. T. Naudé, Auteur |
| Année de publication : |
1988 |
| Article en page(s) : |
p. 193-209 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
Three groups of nine-month-old beef-type steers were fed on a high (treatment I), medium (treatment II) and low (treatment III) nutritional plane for a period of 21 weeks. At the end of this period, five cattle of each treatment were slaughtered. The remaining cattle of treatments II and III (the restricted groups) were then also fed on a high nutritional plane as for those from treatment I and allowed to grow to a final slaughter mass of 440 kg. Treatments were compared on an equal stage (0 week, control ; 23 and 39 weeks) and mass basis (210 kg, control ; 370 and 440 kg live mass) throughout the trial with respect to hide and leather yield and leather physical characteristics.
High yield (hide mass/carcase mass) was not influenced by nutritional restriction and/or a subsequent period of compensatory growth nor did the hide yield change over the entire trial period.
Leather yield (leather area/green hide mass) was higher for nutritionally restricted animals than for unrestricted animals after the initial 23 week period. This treatment difference was eliminated when treatments were compared on an equal mass basis (370 and 440 kg live mass). Leather yield decreased with growth of the animal.
Full-grain upper leather obtained from the hides of nutritionally restricted animals, particularly in treatment III, were stronger (higher tensile and tear strength and lastometer response at grain crack) and more extensible than upper leathers from the hides of unrestricted animals at 23 weeks and 370 kg live mass. These nutritional difference disappeared after the subsequent period of compensatory growth and treatment comparison at 39 weeks and at 370 kg live mass showed no significant differences in upper leather physical properties.
Leathers of greatest strength and extensibility were obtained from the weaner group of aniamsl and all leather physical characteristics (tensile properties, slit tear force and lastometer response) declined with animal growth. Microscopic examination of cross-sectional fibre structure indicated that features contributing to a decrease in leather strength were the development of coarser corium major fibre bundles with less interweaving, a higher angle of weave and an increase in grain-to-corium major ratio in the full-grain leather.
These results indicate that weaner steers subjected to a winter or drought nutritional restriction will produce hides and leathers of the same yield and physical characteristics as nutritionally unrestricted animals provided restricted animals are subsequently exposed to high nutritional veld or feedlot conditions and slaughtered at an equivalent stage of growth or at equivalent live mass. |
| En ligne : |
https://drive.google.com/file/d/1YHss08GC5a0eZArZ7TVwQNfOQaVkb0tN/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9111 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 72 (Année 1988) . - p. 193-209
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The influence of compensatory growth on certain hide and leather characteristics. Part II. Hide and leather yield and leather physical characteristics in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 72 (Année 1988)
