Effects of the Texel muscling quantitative trait locus on carcass traits in crossbred lambs.
Effects of the Texel muscling quantitative trait locus on carcass traits in crossbred lambs.
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特克塞尔肌肉数量性状基因座对杂交羔羊胴体性状的影响。
DOI：
10.1017/s175173110800356x
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Macfarlane JM
中科院分区：
文献类型：
--
作者：
Macfarlane JM
特塞尔肌肉数量性状基因座 (TM-QTL) 是 18 号染色体上的 QTL，最初在纯种英国特塞尔羊中发现，据报道，该基因座可使超声波测量的第三腰椎肌肉深度增加约 4% 至 7%。本研究的目的是全面评估 TM-QTL 并确定它是否可以通过增加杂交屠宰羔羊的胴体肉产量为英国绵羊业带来好处。该QTL对一系列胴体性状的影响，包括体内和解剖测量的影响，在杂合携带者和非携带者羔羊中进行了评估，这些羔羊是通过杂合携带者特克塞尔公羊与来自低地羊群的非携带者骡子（蓝脸莱斯特×苏格兰黑脸）母羊杂交产生的。通过超声波、X 射线计算机断层扫描 (CT) 和胴体解剖测量，发现 TM-QTL 在给定活重或胴体重量下可增加杂交羔羊的腰部肌肉。深度M。通过第三腰椎超声检查 (+4.5%;P= 0.033) 和第五腰椎 CT 扫描 (+6.7%;P= 0.004) 测量，TM-QTL 携带羔羊的腰最长肌 (MLL) 大于非携带羔羊。与非携带者相比，使用 CT 测量的 TM-QTL 携带羔羊的 MLL 宽度和面积也更大（分别为 +3.0%；P= 0.013 和 +5.1%；P= 0.047）。使用 CT 测量的 TM-QTL 携带者的腰部肌肉体积比非携带者大（+5.9%；P= 0.005），与非携带者相比，TM-QTL 携带者的 MLL 解剖重量大+7.1%（P<0.001）。 TM-QTL 携带者中腰部区域所含的胴体瘦肉总产量（LMY）比例略高于非携带者（0.154v.0.145；P=0.006）。然而，发现TM-QTL对通过解剖测量的胴体中的LMY或可销售肉产量的总重量或比例，或者对通过CT或解剖测量的后腿的肌肉没有显着影响。这项工作已经证实，TM-QTL 的遗传与杂交羔羊腰部肌肉的增强有关，正如之前关于纯种特塞尔羔羊的报道。
Texel muscling quantitative trait locus (TM-QTL) is a QTL on chromosome 18, originally identified in purebred UK Texel sheep, which was reported to increase ultrasonically measured muscle depth at the third lumbar vertebra by around 4% to 7%. The objective of the present study was to comprehensively evaluate the TM-QTL and to determine whether it could provide benefits to the UK sheep industry through increased carcass meat yield in crossbred slaughter lambs. Effects of this QTL on a range of carcass traits, including those measuredin vivoand by dissection, were evaluated in heterozygous carrier and non-carrier lambs produced by crossing heterozygous carrier Texel rams with non-carrier Mule (Bluefaced Leicester × Scottish Blackface) ewes from a lowland flock. The TM-QTL was found to increase loin muscling in crossbred lambs at a given live weight or carcass weight, as measured by ultrasound, X-ray computed tomography (CT) and carcass dissection. Depth ofM. longissimus lumborum(MLL) was greater in TM-QTL carrier lambs compared to non-carriers as measured by both ultrasound at the third lumbar vertebra (+4.5%;P= 0.033) and CT scanning at the fifth lumbar vertebra (+6.7%;P= 0.004). Width and area of MLL measured using CT were also greater in TM-QTL carrier lambs compared to non-carriers (+3.0%;P= 0.013 and +5.1%;P= 0.047, respectively). Loin muscle volume measured using CT was greater in TM-QTL carriers than in non-carriers (+5.9%;P= 0.005) and the dissected weight of the MLL was +7.1% greater in TM-QTL carriers compared to non-carriers (P< 0.001). The proportion of the total carcass lean meat yield (LMY) that was contained within the loin region was slightly higher in TM-QTL carriers than in non-carriers (0.154v.0.145;P= 0.006). However, TM-QTL was found to have no significant effect on the total weight or proportion of LMY or of saleable meat yield in the carcass measured by dissection, or on muscling in the hind leg measured by CT or dissection. This work has verified that the inheritance of TM-QTL is associated with increased loin muscling in crossbred lambs, as has previously been reported for purebred Texel lambs.
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期刊：
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