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Articles by M. Becerril-Herrera
Total Records ( 5 ) for M. Becerril-Herrera
  R. Martinez-Rodriguez , P. Roldan-Santiago , S. Flores-Peinado , J.A. Ramirez-Telles , P. Mora-Medina , M.E. Trujillo-Ortega , M. Gonzalez-Lozano , M. Becerril-Herrera , M. Sanchez-Hernandez and D. Mota-Rojas
  The incidence of poor quality meat associated with acute ante mortem stress is a condition that severely affects the pork production chain, so preventing it must become a priority in the pork industry. The aim of this review was to assess the most relevant ante mortem stressors that affect pork quality. Stress-related factors during production, transport, stunning and slaughter must be carefully controlled so as to minimize the proportion of poor quality meat produced. One stress-related effect on pork is called Pale, Soft and Exudative (PSE) meat which occurs as a consequence of numerous factors, some extrinsic, others intrinsic. Thus, it is necessary to undertake a review like the one presented in this article, to discuss such extrinsic factors as: feeding, environmental conditions, types of production (extensive, intensive), farm management, transport, lairage, ante mortem handling at the slaughterhouse and inadequate stunning methods. Second, intrinsic factors must also be analyzed, especially genetic improvement and modified physiometabolic processes and their consequences on the sensory properties of pork meat. The variety of factors that affect pork quality during production, transport, stunning and slaughter must all be carefully controlled in order to minimize the frequency with which this defect occurs.
  V. A. Gonzalez , G. E. Rojas , A.E. Aguilera , S. C. Flores-Peinado , C. Lemus-Flores , A. Olmos-Hernandez , M. Becerril-Herrera , A. Cardona-Leija , M. Alonso-Spilsbury , R. Ramirez-Necoechea and D. Mota-Rojas
  Currently in Mexico there is no regulation ruling over transportation and the rest period before slaughtering quail. An experiment was carried out to evaluate transportation and rest period effects before sacrifice on the metabolic profile, blood gas, pH and meat quality of the Japanese quail carcass. Sixty quail (Coturnix coturnix japonica) were transported to slaughter, on arrival they were randomly divided in 2 groups: with (4 hours) rest and without rest (slaughtered right away). A blood simple was taken before and post sacrifice. After transportation, the rested quail had significantly lower lactate levels (p<0.05), compared to the quail without rest (36.33±6.17 vs. 21.64±2.14, respectively). The results showed that when quail are stressed, pCO2 and lactate levels tend to diminish significantly (p<0.05) compared to mammals. Rest showed a direct effect on temperature (p<0.05), diminishing acidity, reflected though hot and cold carcass pH as compared to the group of quail without rest.
  P. Scnchez-Aparicio , D. Mota-Rojas , A. Verduzco-Mendoza , E. Arch-Tirado , R. Hernandez-Gonzalez , M. Alonso-Spilsbury , M. Gonzalez-Lozano , A. Alfaro-Rodriguez , R. Uribe-Escamilla , M. Becerril-Herrera and M.E. Trujillo-Ortega
  The objective of this study was to establish a range of reference values for blood gas analysis, electrolytes, hematocrit and critical blood variables for guinea pigs anaesthetized with xylazine-ketamine. The influence of the strain (short hair English vs. Duncan-Hartley) was also evaluated. Blood was obtained by cardiocentesis from 40 clinically healthy 8-11 weeks old female adult guinea pigs. Results indicated the following values: pH (7.28-7.55 vs. 7.38-7.53), PCO2 (28-42 vs. 33-44 mmHg), PO2 (18-70 vs. 25-52 mmHg), Na+ (124-141 vs. 126-137 mmol L-1), K+ (3-7.5 vs. 3.6-4.6 mmol L-1), Ca2+ (0.52-1.28 vs. 1.28-1.47 mmol L-1), glucose (64-190 vs. 98-211 mg dL-1), lactate (1-5 vs. 0.3-6.6 mg dL-1) and hematocrit (27-40 vs. 38-49%) for short hair English and Duncan-Hartley guinea pigs, respectively. No differences in the guinea pigs electrolytes or blood gas analysis were found. However, we can confirm that the individual’s pigmented short hair English strain showed the most favorable results in regard to the PCO2, Ca2+ and haematocrit values when submitted to the sedation combination of xylazine-ketamine.
  M. Becerril-Herrera , D. Mota-Rojas , I. Guerrero-Legarreta , M. Gonzalez-Lozano , P. Sanchez-Aparicio , C. Lemus-Flores , S.C. Flores-Peinado , R. Ramirez-Necoechea and M. Alonso-Spilsbury
  The objectives of the present study were to evaluate the effects of increasing space in transportation at different distances, on live weight loss in pigs and to determine the effects of fasting and pre-slaughter lairage period on both live and carcass weights by sex and on pork quality. Seven hundred and twenty pigs Pietrain x (YorkshirexLandrace) were divided into two experimental conditions (EC1 and EC2). EC1 pigs were divided in three groups of 120 animals each and were transported for 8, 16 and 24 h (loading density: 0.35 m2/100 kg). EC2 pigs were divided in three groups of 120 animals, the transport duration was the same as in EC1 (loading density: 0.68 m2/100 kg). Transport duration and space allowance significantly affected (p< 0.01) the posture of the pigs on arrival to the slaughterhouse; there were significant differences (p< 0.01) between genders. When transport time was shorter, a higher number of pigs arrived in a standing posture, more females arrived in a standing position in the group shipped for 8 h. Pig position affected carcass yield, when transportation time was shorter carcass yield was higher. There was a higher percentage (p< 0.01) of pigs at pH 5.8-6.2 in animals transported for 8 h, compared with 16 and 24 h period, independently of the space allowance. Additional space provided to pigs during transportation lead to a better animal welfare in transit and had no decisive influence in the quality of the carcass; nevertheless, the quality of meat improved.
  M. Becerril-Herrera , C. Lemus-Flores , H.J.G. Herrera , M.Alonso-Spilsbury , R. Ramirez-Necoechea and D. Mota-Rojas
  The study was carried out with 13 Mexican Hairless (MHP) and 21 York-Landrace (Y-L) fattened pigs, randomly distributed in 4 treatments: 1) MHP under total confinement, 2) MHP in pasturing conditions, 3) Y-L in total confinement and 4) Y-L in pasturing conditions, all four groups were fed ad libitum. Morph metric growth in 63 days old pigs showed significant differences (p<0.0001) between breeds; however, at the end of the study (175 days old) significant differences were observed (p<0.05), both between breeds and between productive systems for the following variables: height at withers, hind- and fore- cane perimeters and snout length; indicating that the feeding system caused some hypertrophies in the organs mostly exercised. Results on the percentage of ileal apparent digestibility showed significant differences (p<0.001) between breeds and between productive systems too, whereas in the total apparent digestibility, differences between feeding-productive systems were only significant in the MHP. Results indicate that the MHP is a small size animal with thin limbs, these pigs show a great instinct for forage consumption but are unable to take advantage of this since they can not digest fiber, which ends with the myth that swine autochthonous breeds are able to digest fiber.
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