IRTA, Centre de Tecnologia de la Carn, Granja Camps i Armet, 17121 Monells, Spain.
Meat Sci. 2004 Jul;67(3):471-8. doi: 10.1016/j.meatsci.2003.11.020.
A polychotomous logistic regression model was used to identify and assess the risk factors for pork meat becoming pale, soft and exudative (PSE). A total of 116 deliveries, comprising 15,695 commercial pigs delivered from different commercial farms to five Spanish pig commercial abattoirs were surveyed. The PSE condition was described as an ordinal response variable (normal, prone to PSE and PSE) based on measurements of electrical conductivity in the Semimembranosus muscle 1-2 h post-mortem. The RYR1 genotype, the abattoir, the season, the gender, the floor surface in the lorry, the loading system, and the stocking density during transportation influenced the risk of PSE condition, as well as on-farm fasting time, loading time, transportation and lairage times. The effect of the RYR1 gene, determined in a subsample of 1331 pigs, was due to nn stress-susceptible pigs, in which the risk of PSE meat (PQM>6 μs) increased fourfold. Abattoirs should be especially careful in summer, when the risk of PSE meat was found to be double that of winter. The risk of PSE meat decreased with the time of transportation, though its effect depended on the stocking density. Thus, our results indicate that, for transits longer than 3 h, the risk of PSE increases with stocking density during transport, while the opposite occurs for shorter transits.
采用多项逻辑回归模型来识别和评估猪肉变得苍白、松软和渗出（PSE）的风险因素。对来自不同商业养殖场的 15695 头商品猪共 116 批进行了调查，这些猪被运往五个西班牙猪肉商业屠宰场。PSE 状况被描述为基于死后 1-2 小时半膜肌电导率测量的有序反应变量（正常、易发生 PSE 和 PSE）。RYR1 基因型、屠宰场、季节、性别、卡车地板表面、装载系统以及运输过程中的装载密度都会影响 PSE 状况的风险，此外还会影响农场禁食时间、装载时间、运输和待宰时间。在 1331 头猪的子样本中确定的 RYR1 基因的影响归因于 nn 应激易感猪，其中 PSE 肉（PQM>6 μs）的风险增加了四倍。屠宰场在夏季应特别小心，因为此时 PSE 肉的风险是冬季的两倍。随着运输时间的延长，PSE 肉的风险会降低，但这取决于装载密度。因此，我们的结果表明，对于运输时间超过 3 小时的情况，随着运输过程中装载密度的增加，PSE 的风险会增加，而对于较短的运输时间则会出现相反的情况。
