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Articles by M. Becerril-Herrera
Total Records ( 8 ) for M. Becerril-Herrera
  M.Y. Guerrero , S.C. Flores-Peinado , M. Becerril-Herrera , A. Cardona-Leija , M. Alonso-Spilsbury , M.M. Zamora-Fonseca , J. Toca , R. Ramirez , J.A. Toca and D. Mota-Rojas
  The aim of this research was to study the effect of cervical dislocation and electric stunning of the California breed rabbit with a rest period before sacrifice (at 70 days of age) as well as the effect of same on sanguineous pH, temperature, glucose levels, creatine kinase, and slaughter performance. Forty male and female rabbits of the California breed were used. The sacrificed animals had either cervical dislocation or electrical stunning performed on them, then sacrificed according to normal regulatory practices. Our study is based on two insensibilization methods, cervical dislocation and electric stunning. The results show that plasmatic glucose and temperature before sacrifice and after insensibilization were not affected significantly (p>0.05) in the rest period or by sacrificial method. The pH of the animals that were given a rest period previous to sacrifice was significantly different from the animals that were not given rest; no significant difference between the insensibilization methods was found. We found a significant difference for bleeding times (p< 0.05) between cervical dislocation with rest compared to electrical stunning without rest. The rest period (p>0.05) did not significantly affect the volume of blood recovered during bleeding. However when comparing bleeding volume by insensibilization method significant statistical differences (p< 0.05) were observed. There were no significant difference in the variables of carcass evaluation; however, the lack of a rest before sacrifice affected pH values and temperature of the rabbit meat significantly.
  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.
  M.J. Maldonado , D. Mota-Rojas , M. Becerril-Herrera , S. Flores-Peinado , D. Camacho-Morfin , A. Cardona-Leija , R. Ramirez-Necoechea , L. Morfin-Loyden , M. Gonzalez-Lozano , M.E. Pereda-Solis and M. Alonso-Spilsbury
  The objective of this study, was to evaluate the effect of two stunning methods on blood gasometry, metabolic profile, acid-base balance and carcass quality on broilers. Sixty broilers were monitored. Before sacrifice, the birds were weighed and randomly divided by sacrifice method into 2 groups: decapitation (30) and electric stunning (30). Bleeding was timed and a blood samples were taken in order to evaluate critical blood parameters. The chickens remained 7 sec in the scalding bucket at a 33 C, carcass meat pH and temperature were measured warm, post thermal shock and cold. The pCO2 was the highest value measured on the desensitized chickens using the electric stunning method and the pO2 was higher on the decapitated birds. Even though no differences were noted, it is worth mentioning that glucose levels were higher than 200 mg dL-1 and lactate was extremely low (5 mg dL-1) regardless of sacrificial method. Highly significant differences were observed in pre-shock pH and post shock values of the decapitated bird (from acid to neutral). We conclude that regardless of the sacrificial method, the physiological variables were not modified between groups, and therefore had no negative effects on the broiler carcass.
  M. Becerril-Herrera , O. Guzman-Pina , M. Alonso-Spilsbury , E.V. Dorsey-San Vicente , C. Lemus-Flores , S. Flores-Peinado , R. Ramirez-Necoechea and D. Mota-Rojas
  The objective of the present study was to evaluate the morphometry and carcass traits of Creole goats sacrificed and packed in a Federal Inspection Plant (FIP). The study was carried out in a FIP abattoir during May and June 2004. Fifty Creole male goats, 40 to 50 days old were used, brought form nearby family farms. Goats were transported without stops and they were not fed, nor provided with water. Carcasses were graded and 11 indicators were measured: both hot and cold carcass yields, cold carcass temperature, viscera weight, morphometry and pH, among others. When comparing the hot carcass weight with and without viscera (5.03 vs. 4.55), the values measured indicated that viscera represented 20.22% of the animals weight. The difference observed between hot carcass and cold carcass weight was 4.55 vs. 4.28 kg, respectively. Positive correlations were determined (R = 0.96) between hind-limbs (R = 0.65) and forelimbs (R = 0.69), as well as the one registered of both limbs with the hind and fore canes` perimeters. On the other hand, the abdominal and thoracic regions were highly correlated (R = 0.9). This is an indicator of the animal biotype, which shows that these animals are long linear with highly developed limbs. The pH mean of the hot carcass and the cold carcass was 6.06 and 5.97, respectively.
  M. Becerril-Herrera , M. Zermeno , D. Mota-Rojas , G.H. Gonzalez , C. Casas-Garcia , J. Toca-Ramirez , R. Ramirez-Necoechea , J.A. Toca-Ramirez , C. Lemus-Flores and M. Alonso-Spilsbury
  Ten equine carcasses from creole horses were used, distributed by sex: 5 females and 5 males. Animals were identified with a mark in their posterior limbs using indelible ink in order to follow the carcass up to the butchery. Each cut was weighed in order to characterize the shrinkage percentage and carcass yield. Samples of the Longissimus dorsi muscle at the level of the tenth rib were taken at the butchery in order to carry out a proximal chemical analysis. The average percentage of protein was 18.6, which turned out to be 7.5% lower than the one reported by others authors. In adult animals gaskins, shoulder blades, ribs and flanks (spare meat for fillets) corresponded to 30.0, 21.3, 31.2 and 16.5%, respectively, of the total carcass. In young animals gaskins represented 29.5%, shoulder blades 19.6%, ribs 31.3% and flanks, 12.5% of the total carcass. We conclude that horse meat can be an excellent alternative for consumption for its high content in proteins and low levels of fat. It is also worth mentioning the higher losses for shrinkage due to the high content of humidity as well as the characterization of the yield at cutting.
  D. Mota-Rojas , ADL.Reyes , M. Becerril-Herrera , S. Flores-Pintado , M. Alonso-Spilsbury , L.A.Cardona and C. Lemus-Flores
  The objective of the present study was to evaluate the effects of sex and breed, on the slaughtering performance, carcass yield and cutting process in rabbits. Eighteen female and male rabbits of the Chinchilla and California breeds were used, animals were sacrificed according to the Official Mexican Norm. No significant differences between breeds and gender for all the variables were observed, except for ham roundness; California does showed the highest value, being significantly different from the males for both breeds. At 70 days, California rabbits showed a greater body development compared with the Chinchilla breed. Also, no significant differences were found between breeds for the primary cuts; although there was a numeric difference between Chinchilla and California rabbits regarding loin cut (291 vs. 273 g, respectively). The carcass yield obtained in this study was 58.51%, the greatest yield was observed in California does. Positive correlations were found between average daily gain and live weight (r= .89); skin weight and hot carcass weight (r=0.90), and live weight with both, skin weight (r= 90) and hot carcass weight (r=0.91).
  Gonzalez H.G. , D. Mota-Rojas , M. Becerril-Herrera , C.Casas-Garcia , M. Zermeno , R. Ramírez-Necoechea , J.A.Toca-Ramirez , C. Lemus , J. Toca-Ramirez and M. Alonso-Spilsbury
  In Mexico, equine use for meat production is not commonly found; the highest percentage of equine meat that can be possibly consumed comes mostly from culled animals. The objective of the present study was to characterize the slaughter performance and test the effect of gender in the incidence of injuries during transportation, in offals and hot carcass yields in twelve creole horses. Results indicate an average live weight of 296 Kg and carcass weight of 175 Kg, equivalent to 60% yield. It is possible that the husbandry method commonly used on pasturing the animals, decreased the thoracic development and increased the corporal length and diameter of the leg. With regard to slaughtering yield, red viscera represented 4.3%, green viscera 30%, skin 6%, limbs 2.8%, head 4.4% and loss at slaughter 1.5% of the total live weight. Average body condition in the horses was poor. No significant differences were observed between genders in the presence of injuries, although there was an influence of the arrival position on the severity of injuries; animals that were facing the direction of travel (rear-facing) showed injury 2 affecting subcutaneous and muscular tissues, whereas animals facing backward did not show injuries or these were not too severe.
  M.G. Nunez-Gutierrez , J.M. Tapia-Gonzalez , M. Becerril-Herrera , R. Ramirez-Necoechea , M. Alonso-Spilsbury and D. Mota-Rojas
  The objective of this study was to diagnose the risks of microbiological contamination in 3 meet products: Frankfurt type sausage, Virginia ham and dried salted pork, made in the meat processing plant at the University of Guadalajara. The influence from the physical infrastructure of the plant was evaluated such as the type and number of handlers, number of people present when the handling was carried out, as well as the time of manipulation and storage in refrigeration, the environmental conditions in processing areas and refrigeration and water from the municipal source (used to wash hands), equipment and utensils. Meat products with various preparation processes were chosen, individual microbiological tests for Salmonella, Escherichia coli and Staphylococcus aureus were made. The 90 point sanitary questionnaire was used to verify sanitation for physical risks in the processing plant. The results were analyzed using the EpiInfo® 2002 data base. There was a significant effect (p< 0.05) between independent variables, number of people coming in per day, and time of refrigeration with S. aureus present in the sampled food. Using standard comparison we observed that 100% of the products had some kind of microorganism. The installations complied entirely with the 90 point questionnaire by 23.08%, partially by 42.31% and was incompliant by 34.62%.
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