Effects of breed and age at slaughter on leather produced from export lambs reared on hill country

Passman, Adam M.; Sumner, R. M. W.

doi:10.1080/03015521.1987.10425576

Cited by 4 publications

(6 citation statements)

References 6 publications

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“…Angel et al (1997) correspondingly found that ostrich leather thickness increased linearly with age, with a positive correlation of 0.59 existing between age and leather thickness. In lambskin, leather thickness was found to increase from 0.57 mm at 10 weeks of age to 0.67 at 30 weeks of age in the flank region (Passman & Sumner, 1987). Corresponding age differences in the butt region ranged from 0.71 mm to 0.82 mm over the same age interval.…”

Section: Discussionmentioning

confidence: 76%

“…The tensile strength of 53 skins in the latter study was above 75 kg/cm² (or 7.4 N/mm²). Passman & Sumner (1987) found that the strength of lambskin increased with age, after correction for leather thickness. This is in partial agreement with results from the present study, where tensile strength tended to increase with age.…”

Section: Discussionmentioning

confidence: 99%

“…A degree of correspondence across localities on a skin cannot be regarded as indicative of selection response in such traits. However, breed differences in the physical leather characteristics of sheep suggest the possibility of genetic influences upon leather quality (Passman & Dalton, 1982;Passman & Sumner, 1987;Holst et al, 1997;Snyman & Jackson-Moss, 2000). Further research in this area is indicated to explore the possibility of altering physical skin and nodule parameters by genetic selection.…”

Section: Discussionmentioning

confidence: 99%

“…sites: 1 -neck; 2 -mid crown area; 3 -upper leg; 4 -lower flank; 5 -butt An A4-sized leather sample from the butt locality (Site 5 in Figure 1) of each of these skins was obtained and tested at the SA Wool Testing Bureau. The butt region is considered an official sampling position for physical leather traits in lambs (Passman & Sumner, 1987;Snyman & Jackson-Moss, 2000). Samples were used to assess for tensile strength, elongation at grain break and slit tear strength on an Instron machine, as described by Snyman & Jackson-Moss (2000).…”

Section: Figurementioning

confidence: 99%

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Effect of age on leather and skin traits of slaughter ostriches

Cloete¹,

Schalkwyk²,

Hoffman³

et al. 2004

SA J. An. Sci.

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Little is known about the factors affecting leather and skin traits in ostriches. The effect of age on physical skin traits of slaughter ostriches was consequently investigated. Forty skins representing slaughter ages ranging from five to 14 months were selected to represent means of the respective age groups with regard to skin size and slaughter weight. It was evident that leather thickness increased with age. A similar tendency was observed for tensile strength. The number of nodules/dm² declined by 2.8 nodules per month increase in slaughter age. Average nodule diameter increased at a rate of 0.08 mm per month of age. The number of nodules/dm² decreased towards body positions situated nearer to the ventral aspect of the ostrich (upper leg and lower flank). Positions nearer to the centre back had more nodules/dm². The nodules on the neck and mid-crown area were smaller in diameter than those situated on the other body positions, with little difference between the upper leg, lower flank and butt positions. Repeatability estimates for the physical skin traits were in the medium to high range. Age thus affects physical leather traits to a lesser extent, apart from leather thickness. It does, however, exert an important influence on the nodule traits that were considered, and needs to be considered in the marketing of ostrich leather.

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Section: Discussionmentioning

confidence: 76%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

See 2 more Smart Citations

Effect of age on leather and skin traits of slaughter ostriches

Cloete¹,

Schalkwyk²,

Hoffman³

et al. 2004

SA J. An. Sci.

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“…Previous studies in New Zealand lambs have identified the effects of breed and age at slaughter on leather quality 19‐21 . Skin thickness has also been positively correlated with lamb survival in Coopworth lean and fat selection lines, 22 and preliminary estimates in New Zealand Romney animals indicate skin thickness at 8 months of age has a moderate heritability (0.26 ± 0.22), with a favourable genetic correlation between skin thickness and survival at weaning (0.27 ± 0.04) 23 .…”

Section: Introductionmentioning

confidence: 99%

Genetic variation in skin traits in New Zealand lambs

et al. 2022

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BACKGROUND This study explored the genetic variability in the New Zealand sheep population for economically important skin traits. Skins were collected at slaughter from two progeny test flocks, resulting in 725 skins evaluated for grain strain, flatness, crust leather strength and overall suitability for shoe leather. DNA profiles collected from skins post‐slaughter were matched to individual animals using previously collected high‐density genotypes. RESULTS Considerable phenotypic variation for skin traits was observed, with around 40% of the skins being identified as suitable for high‐value shoe leather production. Several key traits associated with leather production, including flatness, tear strength, grain strength and grain strain were found to be moderate to highly heritable (h2 = 0.28–0.82). There were no major significant genome‐wide association study (GWAS) peaks associated with many of the traits examined, however, one single‐nucleotide polymorphism (SNP) reached significance for the flatness of the skin over the hindquarters. CONCLUSION This research confirms that suitable lamb skins can be bred for use as high‐value shoe leather. While moderately to highly heritable, skin traits in New Zealand lambs appear to be polygenic with no genes of major effect underlaying the traits of interest. Given the complex nature of these traits, the identification and selection of animals with higher‐value skins may be enabled by geomic selection. © 2022 The Authors. Journal of The Science of Food and Agriculture published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

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