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Beef Beef is a measure of the quality of an important indicator of the value of goods, while the poor beef production and a higher incidence of a constraint to the Chinese beef producers fast and healthy and sustainable development of the technical bottlenecks. A variety of factors such as beef cattle slaughter breed, sex, age, slaughtering season, transport time, transport density, fasting time, slaughtered state, slaughtered time, slaughtering methods affect beef quality, scientific, standardized management can be effective ante-mortem reduce the incidence of low-grade beef, improve beef quality. In this study all aspects of starting from the slaughter, slaughter-depth study of the impact of factors on beef quality, and from the post-mortem muscle glycogen and explore the relationship between the pH value of poor quality beef in the mechanism. The results showed that: 1, follow-up study of a company in recent years, various management aspects slaughter, carcass limit on the statistical analysis of the pH value, come summer, the incidence of DFD beef than in winter; waiting pens density and temperature and humidity, as well as short transport on the occurrence of DFD beef has little effect. DFD meat slaughtered cattle early morning low incidence. 2, the control slaughter factor in different seasons of the occurrence of DFD meat, obtained DFD meat slaughter time affect the incidence of important factors, slaughtered at 24 h the lowest incidence of DFD beef, beef slaughtered 16 h the DFD higher incidence. Not mixed group slaughtered manner and quiet, suitable temperature and humidity environment can effectively reduce the DFD slaughtered beef incidence. Winter morning, slaughtered 24 h, stun slaughter cattle lowest incidence of DFD meat. Slaughtered after the first operation mode of transport before slaughter can effectively prevent the occurrence of DFD beef. 3, the quality of the samples was measured indicators come summer, halal slaughter of cattle higher incidence of PSE meat. After the first transport slaughtered 8h, after the first transport slaughtered slaughtered at 24 h and 24 h after the first transport are ideal ante approach. Color indicators than L * b * is more beef as judged inferior standard meaning. Slaughter and beef quality factors are closely related, and established a regression equation model. DFD beef criteria for the pH24 values ??≥ 6.10, L * lt; 37.40 ± 3.78, b * lt; 10.25 ± 1.94, Drip loss value lt; 7.36% ± 2.81. Extreme pH value ≥ 6.10, beef quality will have a greater difference. 4, measuring the pH value of the carcass after slaughter and muscle glycogen content. Muscle glycogen content can be obtained as a better indicator of stress before slaughter, slaughter cattle stress, muscle glycogen content was significantly reduced. Slaughter cattle have higher muscle glycogen content in the incidence of preventable DFD beef and improve the quality of beef. 16 h slaughtered beef cattle production quality is unpredictable.
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