Muscle fibre characteristics of two contrasting sheep breeds: Scottish Blackface and Texel

L Bunger, EA Navajas, L Stevenson, NR Lambe, CA Maltin, G Simm, AV Fisher, KC Chang

Research output: Contribution to journalArticle

Abstract

This study evaluates the effects of breed and sex, together with those of birth weight and litter size, on muscle fibre type characteristics in Texel (TEX) and Scottish Blackface sheep (SBF). The M.longissimus thoracis et lumborum (LTL) of TEX had a significantly higher total muscle cross-sectional area (16%), a higher total fibre number (20%) and a higher muscle CT density (5%) than the SBF but had a similar average muscle fibre size. The frequency of slow fibres in the LTL in TEX was lower than in SBF (7.5% vs. 9.6%). Muscle fibre histochemistry similarly demonstrated that the oxidative fibre frequency in TEX was 10% lower than in SBF. The inter-fibre lipid content in TEX was also significantly lower than in SBF. Correspondingly, TEX displayed higher frequency (91.7% vs. 90.9% in SBF) and higher relative total area (92.5% vs. 90.4% in SBF) of fast fibres. These breed differences in muscle fibre traits indicate underlying genetic variation, and future analyses will evaluate the link of these traits to meat quality and assess the usefulness of these traits in breeding programmes.
Original languageEnglish
Pages (from-to)372 - 381
Number of pages10
JournalMeat Science
Volume81
Issue number2
Publication statusFirst published - 2009

Fingerprint

Scottish Blackface
Texel
sheep breeds
muscle fibers
sheep
dietary fiber
longissimus muscle
muscles
breed differences
histochemistry
litter size
birth weight
meat quality
lipid content
breeds
genetic variation
gender
breeding

Bibliographical note

52110086
62100054

Keywords

  • Breed
  • Histology
  • Lamb
  • Meat quality
  • Muscle fibre types
  • Scottish Blackface
  • Sex effect
  • Sheep

Cite this

Bunger, L., Navajas, EA., Stevenson, L., Lambe, NR., Maltin, CA., Simm, G., ... Chang, KC. (2009). Muscle fibre characteristics of two contrasting sheep breeds: Scottish Blackface and Texel. Meat Science, 81(2), 372 - 381.
Bunger, L ; Navajas, EA ; Stevenson, L ; Lambe, NR ; Maltin, CA ; Simm, G ; Fisher, AV ; Chang, KC. / Muscle fibre characteristics of two contrasting sheep breeds: Scottish Blackface and Texel. In: Meat Science. 2009 ; Vol. 81, No. 2. pp. 372 - 381.
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Bunger, L, Navajas, EA, Stevenson, L, Lambe, NR, Maltin, CA, Simm, G, Fisher, AV & Chang, KC 2009, 'Muscle fibre characteristics of two contrasting sheep breeds: Scottish Blackface and Texel', Meat Science, vol. 81, no. 2, pp. 372 - 381.

Muscle fibre characteristics of two contrasting sheep breeds: Scottish Blackface and Texel. / Bunger, L; Navajas, EA; Stevenson, L; Lambe, NR; Maltin, CA; Simm, G; Fisher, AV; Chang, KC.

In: Meat Science, Vol. 81, No. 2, 2009, p. 372 - 381.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Muscle fibre characteristics of two contrasting sheep breeds: Scottish Blackface and Texel

AU - Bunger, L

AU - Navajas, EA

AU - Stevenson, L

AU - Lambe, NR

AU - Maltin, CA

AU - Simm, G

AU - Fisher, AV

AU - Chang, KC

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N2 - This study evaluates the effects of breed and sex, together with those of birth weight and litter size, on muscle fibre type characteristics in Texel (TEX) and Scottish Blackface sheep (SBF). The M.longissimus thoracis et lumborum (LTL) of TEX had a significantly higher total muscle cross-sectional area (16%), a higher total fibre number (20%) and a higher muscle CT density (5%) than the SBF but had a similar average muscle fibre size. The frequency of slow fibres in the LTL in TEX was lower than in SBF (7.5% vs. 9.6%). Muscle fibre histochemistry similarly demonstrated that the oxidative fibre frequency in TEX was 10% lower than in SBF. The inter-fibre lipid content in TEX was also significantly lower than in SBF. Correspondingly, TEX displayed higher frequency (91.7% vs. 90.9% in SBF) and higher relative total area (92.5% vs. 90.4% in SBF) of fast fibres. These breed differences in muscle fibre traits indicate underlying genetic variation, and future analyses will evaluate the link of these traits to meat quality and assess the usefulness of these traits in breeding programmes.

AB - This study evaluates the effects of breed and sex, together with those of birth weight and litter size, on muscle fibre type characteristics in Texel (TEX) and Scottish Blackface sheep (SBF). The M.longissimus thoracis et lumborum (LTL) of TEX had a significantly higher total muscle cross-sectional area (16%), a higher total fibre number (20%) and a higher muscle CT density (5%) than the SBF but had a similar average muscle fibre size. The frequency of slow fibres in the LTL in TEX was lower than in SBF (7.5% vs. 9.6%). Muscle fibre histochemistry similarly demonstrated that the oxidative fibre frequency in TEX was 10% lower than in SBF. The inter-fibre lipid content in TEX was also significantly lower than in SBF. Correspondingly, TEX displayed higher frequency (91.7% vs. 90.9% in SBF) and higher relative total area (92.5% vs. 90.4% in SBF) of fast fibres. These breed differences in muscle fibre traits indicate underlying genetic variation, and future analyses will evaluate the link of these traits to meat quality and assess the usefulness of these traits in breeding programmes.

KW - Breed

KW - Histology

KW - Lamb

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KW - Sex effect

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JO - Meat Science

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Bunger L, Navajas EA, Stevenson L, Lambe NR, Maltin CA, Simm G et al. Muscle fibre characteristics of two contrasting sheep breeds: Scottish Blackface and Texel. Meat Science. 2009;81(2):372 - 381.