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

The effect of conditioning period on loin muscle tenderness in crossbred lambs with or without the Texel muscling QTL (TM-QTL).
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调理期对带或不带特塞尔肌肉 QTL (TM-QTL) 的杂交羔羊腰部肌肉嫩度的影响。

DOI:
10.1016/j.meatsci.2010.03.029
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发表时间:
2010
期刊:
影响因子:
7.1
通讯作者:
Lambe NR
Lambe NR
中科院分区:
农林科学1区
文献类型:
--
作者:
Lambe NR

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一个Texel肌肉数量性状基因座(TM-QTL)已被确定在染色体18上,这增加了腰部肌肉,但也可能有一个负面的影响,机械测量的腰部嫩度在杂交羔羊,这取决于调理时间。本研究探讨了一系列预处理时间(3、5、7或9d)对腰肌嫩度TM-QTL效应的影响。使用TM-QTL杂合的Texel公羊,与非携带者Mule母羊交配,产生杂合(n=45)和野生型(n=50)杂交羔羊。在固定的年龄(+11.5%; P=0.038)和固定的胴体重(+10.2%; P =0.064)下,TM-QTL携带者的腰最长肌重量高于非携带者。结果表明,在处理3d(P=0.002)、5d(P=0.003)和7 d(P=0.03)后,TM-QTL携带者的韧性显著高于非携带者,而在处理9d后差异不显著(P=0.32)。与非携带者羔羊相比,在3天和5天的条件下,TM-QTL携带者羔羊中高于消费者可接受的韧性阈值的样品比例更大,在7天相似,但在9天较低。结果表明,TM-QTL对杂交羔羊里脊肉嫩度的负效应可以通过7天以上的适应处理来克服。通过使用增强加工方案的公司销售TM-QTL载体羔羊可能是有益的,因为腰部肌肉重量更高,对肉质没有负面影响。
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 9days) 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 3days (P=0.002), 5days (P=0.003) or 7days (P=0.03), but was not significantly different after 9days 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 5days of conditioning, similar at 7days, but lower at 9days. The results suggest that the negative effect of TM-QTL on loin tenderness in crossbred lambs can be overcome by conditioning for more than 7days. 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.
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