The effect of the Texel muscling QTL (TM-QTL) on meat quality traits in crossbred lambs

NR Lambe, JM Macfarlane, RI Richardson, O Matika, W Haresign, L Bunger

    Research output: Contribution to journalArticle (Academic Journal)peer-review

    10 Citations (Scopus)

    Abstract

    A quantitative trait locus (QTL) has been identified on chromosome 18 in Texel sheep (TM-QTL) that increases depth and area of the longissimus dorsi muscle. The study aimed to assess the pleiotropic QTL effects on key meat quality traits (toughness and intramuscular fat content after ≥ 7d aging) of crossbred lambs carrying one copy of the TM-QTL. The results showed that male Texel × Mule lambs carrying the TM-QTL had significantly less intramuscular fat (1.86% vs. 2.25%) and higher toughness, with increased variation, in the loin muscle, compared to non-carrier males. Similar conclusions were obtained using two different types of tenderometer equipment: one using the Volodkevitch test (average shear force of 4.17 kgF for carrier males, 2.61 kgF for non-carrier males) and one using the MIRINZ test (average shear force of 6.18 kgF for carrier males, 5.22 kgF for non-carrier males). Although most toughness measurements were within published consumer acceptability limits, a few individual TM-QTL carrier lambs had unacceptably tough meat, despite enhanced post-slaughter processing. The TM-QTL did not significantly affect loin toughness in female lambs, leg toughness in either sex, or intramuscular fat content. These results should be considered, alongside direct effects of the TM-QTL on muscling and carcass composition, in recommendations for the use of this QTL by sheep breeders.
    Translated title of the contributionThe effect of the Texel muscling QTL (TM-QTL) on meat quality traits in crossbred lambs
    Original languageEnglish
    Pages (from-to)684 - 690
    JournalMeat Science
    Volume85
    DOIs
    Publication statusPublished - 2010

    Bibliographical note

    Publisher: Elsevier

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