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Articles by I. Guerrero-Legarreta
Total Records ( 2 ) for I. Guerrero-Legarreta
  D. Mota-Rojas , M. Becerril Herrera , M.E. Trujillo-Ortega , M. Alonso-Spilsbury , S.C. Flores-Peinado and I. Guerrero-Legarreta
  The aim of this research was to study the effects of pre-slaughter transport and lairage on the chemical serologic profile of swine, as well as its relationship with qualitative aspects of meat: pH, color and temperature. Forty eight Pietrain x Landrace pigs were monitored (24 females and 24 barrows). They were transported on straw bedding trucks without stops during 2 h and deprived of feed and water. Blood samples were taken before loading, at arrival to the slaughterhouse, after lairage and during bleeding (20 sec after they were electrically stunned). At arrival to the slaughterhouse pigs were randomly distributed in 4 groups: Rested (n = 24) non-rested (n = 24) these groups were also divided by sex. Blood samples were taken form groups 1 and 2 and the animals sent directly to the slaughter pens, whereas groups 3 and 4, after blood sampling, were taken to lairage pens. Glucose and Creatine Kinase (CK) showed a high increase in blood concentration, associated to an increase in muscular activity and a decrease in globulins concentration as a consequence of stress and immunosuppression. Hyperglycemia and lactic acidosis detected in animals without rest were statistically different (p<0.05) compared to the group that rested. Bicarbonate level significantly decreased (p<0.05) in non-rested animals as compared to rested animals. Results indicated that animals without rest before slaughter can show hemodynamic and metabolic alterations that lead to hyperglycemia, lactic acidosis and an abrupt descent of pH, altering the carcass color.
  M. Carrillo del Valle , D.T. Velez-Trujillo , I. Guerrero-Legarreta , M. Becerril-Herrera , R. Ramirez-Necoechea , M. Alonso-Spilsbury , S. Flores-Peinado and D. Mota-Rojas
  The research for post-mortem tenderizing methods comes about from the need to provide good tasting and uniform quality in meat products, considering tenderness as the most important quality characteristic. A number of researchers studied various methods in order to improve meat tenderness cause by the physico-chemical condition of muscle contractile proteins, connective tissue or both. During post mortem storage, the muscle undergoes a series of biochemical, histological and physical events which collectively are called rigor mortis. Variation of rigor mortis events largely influences meat acceptability. Electric Stimulation (ES) directly affects meat sensory characteristics (color, odor and flavor and tenderness). Other factor determining meat quality of stimulated meat are time elapsed from slaughtering to stimulation, ripening and storage temperature after stimulation.
 
 
 
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