The effect of the Texel muscling QTL (TM-QTL) on meat quality traits in crossbred lambs
2010
Lambe, N.R. | Macfarlane, J.M. | Richardson, R.I. | Matika, O. | Haresign, W. | Bünger, L.
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 ⩾7days 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% versus 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 4.17kgF or 40.9N for carrier males, 2.61kgF or 25.6N for non-carrier males) and one using the MIRINZ test (average shear force of 6.18kgF or 60.6N for carrier males, 5.22kgF or 51.2N 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.
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