The effect of conditioning period on loin muscle tenderness in crossbred lambs with or without the Texel Muscling QTL (TM-QTL)

N. R. Lambe, W. Haresign, J. M. Macfarlane, R. I. Richardson, O. Matika, L. Bunger

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8 Citations (SciVal)


A Texel muscling quantitative trait locus (TM-QTL) has been identified on chromosome 18, which increases loin muscling, but may also have a negative impact on mechanically-measured loin tenderness in crossbred lambs, depending on conditioning time. This study investigated the influence of a range of conditioning times (3, 5, 7 or 9 days) on the effect of TM-QTL on loin muscle tenderness. Using Texel rams heterozygous for TM-QTL, mated to non-carrier Mule ewes, heterozygous (n = 45) and wild-type (n = 50) crossbred lambs were produced. Weight of the valuable Longissimus lumborum muscle was higher in TM-QTL carriers than non-carriers, when compared at a fixed age (+11.5%; P = 0.038), with the same trend at a fixed carcass weight (+10.2%; P = 0.064). Toughness, measured by shear force, was significantly higher in samples from TM-QTL carriers than non-carriers, after conditioning for 3 days (P = 0.002), 5 days (P = 0.003) or 7 days (P = 0.03), but was not significantly different after 9 days of conditioning (P = 0.32). Compared to non-carrier lambs, the proportion of samples above consumer acceptability thresholds for toughness was greater in the TM-QTL carrier lambs after 3 and 5 days of conditioning, similar at 7 days, but lower at 9 days. The results suggest that the negative effect of TM-QTL on loin tenderness in crossbred lambs can be overcome by conditioning for more than 7 days. Marketing of TM-QTL carrier lambs through companies that use enhanced processing protocols could be beneficial, due to higher loin muscle weights, without negative effects on meat quality. Keywords: Meat eating quality; Meat quality; Muscularity; Texel; Lambs; QTL
Original languageEnglish
Pages (from-to)715-720
Number of pages6
JournalMeat Science
Issue number4
Early online date21 Mar 2010
Publication statusPublished - 01 Aug 2010


  • meat eating quality
  • meat quality
  • muscularity
  • Texel
  • lambs
  • QTL


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