Institute of Food Quality and Safety, University of Veterinary Medicine, Bischofsholer Damm 15, D-30173 Hannover, Germany.
Meat Sci. 2010 May;85(1):127-33. doi: 10.1016/j.meatsci.2009.12.016. Epub 2009 Dec 21.
The pig genetics of Duroc, Pietrain (MHS homozygote negative, PiNN), Pietrain (MHS homozygote positive, PiPP) and a F2-Duroc-Pietrain cross-breed were analyzed. The animals had comparable (P>0.05) carcass weights, but the PiPP pigs had higher carcass yield and lean meat values (P<0.05). Considering the meat quality characteristics, the PiPP showed a faster pH drop and higher electrical conductivity, drip loss, shear force as well as lightness and redness values (P<0.05). The PiPP animals had less slow-twitch-oxidative (STO) and more fast-twitch-glycolytic (FTG) muscle fibers, whereas the results of the Duroc animals were converse (P<0.05). The STO and FTG fibers of the PiPP animals were larger than those of the other genetics (P<0.05). The analysis of the mitochondrial respiratory activity (MRA) using permeabilized longissimus muscle fibers resulted in no differences between the pig genetics before and immediately after slaughter. During chilling the MRA decreased in all pigs but to a higher extent in the PiPP pigs (P<0.05).
杜洛克、皮特兰（MHS 纯合子阴性，PiNN）、皮特兰（MHS 纯合子阳性，PiPP）和杜洛克-皮特兰杂交 F2 代猪的遗传学特性进行了分析。这些动物的胴体重量相当（P>0.05），但 PiPP 猪的胴体产肉率和瘦肉值更高（P<0.05）。考虑到肉质特性，PiPP 表现出更快的 pH 值下降和更高的电导率、滴水损失、剪切力以及亮度和红色值（P<0.05）。PiPP 动物的慢收缩氧化（STO）肌纤维较少，快收缩糖酵解（FTG）肌纤维较多，而杜洛克动物的结果则相反（P<0.05）。PiPP 动物的 STO 和 FTG 纤维比其他遗传类型的纤维更大（P<0.05）。使用通透的背最长肌纤维对线粒体呼吸活性（MRA）进行分析，宰前和宰后即刻猪的遗传类型之间没有差异。在冷却过程中，所有猪的 MRA 都有所下降，但 PiPP 猪的下降幅度更大（P<0.05）。
