Lloyd Sally S, Valenzuela Jose L, Steele Edward J, Dawkins Roger L
CY O'Connor ERADE Village Foundation, P.O. Box 5100, Canning Vale South, WA 6155, Australia.
CY O'Connor Centre for Innovation in Agriculture, Murdoch University, 5 Del Park Road, Box 1, North Dandalup, WA 6207, Australia.
Int J Food Sci. 2017;2017:3948408. doi: 10.1155/2017/3948408. Epub 2017 Oct 23.
Extreme marbling or intramuscular deposition of lipid is associated with Wagyu breeds and is therefore assumed to be largely inherited. However, even within 100% full blood Wagyu prepared under standard conditions, there is unpredictable scatter of the degree of marbling. Here, we evaluate melting temperature ( ) of intramuscular fat as an alternative to visual scores of marbling. We show that "long fed" Wagyu generally has below body temperature but with a considerable range under standardized conditions. Individual sires have a major impact indicating that the variation is genetic rather than environmental or random error. In order to measure differences of lower marbling breeds and at shorter feeding periods, we have compared in subcutaneous fat samples from over the striploin. Supplementary feeding for 100 to 150 days leads to a rapid decrease in of 50% Red Wagyu (Akaushi) : 50% European crosses, when compared to 100% European. This improvement indicates that the genetic effect of Wagyu is useful, predictable, and highly penetrant. Contemporaneous DNA extraction does not affect the measurement of . Thus, provenance can be traced and substitution can be eliminated in a simple and cost-effective manner.
极高的大理石花纹或肌内脂肪沉积与和牛品种相关，因此被认为在很大程度上是可遗传的。然而，即使在标准条件下制备的100%纯种和牛中，大理石花纹的程度也存在不可预测的差异。在此，我们评估肌内脂肪的熔点（ ）作为大理石花纹视觉评分的替代方法。我们发现，“长期育肥”的和牛通常其熔点低于体温，但在标准化条件下有相当大的范围。个体公牛有重大影响，表明这种变异是遗传的，而非环境因素或随机误差导致。为了测量较低大理石花纹品种以及较短育肥期的差异，我们比较了来自里脊上皮下脂肪样本的熔点。与100%欧洲牛相比，对50%红和牛（赤牛）：50%欧洲杂交牛进行100至150天的补充饲养会导致熔点迅速下降。这种改善表明和牛的遗传效应是有用的、可预测的且高度显著的。同时进行DNA提取不会影响熔点的测量。因此，可以以简单且经济高效的方式追踪来源并消除替代情况。
