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Search Results: 1 - 10 of 18624 matches for " Alberto Barreras; "
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Effects of Freezing Temperature and Defrosting Method on Pork Quality Characteristics
Cristina P?rez Linares,Fernando Figueroa Saavedra,Alberto Barreras Serrano
Journal of Animal and Veterinary Advances , 2012,
Abstract: Twenty-eight pieces of Longissimus dorsi were collected at 24 h postmortem and used to evaluate two freezing temperatures (FT) and two defrosting methods (DM). The treatments were the result of the combination of FT (commercial temperature: -23.0oC and domestic temperature: -14.3oC) and DM (immersion in water at room temperature for no more that 2 h, and in refrigeration at 4oC for 24 h). The characteristics evaluated were: pH, color (L*, a* and b*), shear force (SF), drip loss (DL), and water holding capacity (WHC). Data were analyzed by analysis of variance for a completely randomized design with sub sampling using ANOVA procedure of SAS. Luminosity (L*) was affected by FT but not by MD (p>0.05). Interactions of FT and DM were significant (p<0.05) for pH, a*, DL and WHC. Higher DL percentages corresponded to DM at 4oC for 24 h independent of FT. Values for WHC were higher in domestic FT at -14.3oC independent of DM. Defrosting of meat by immersion in water caused less DL independent of FT. In addition, defrosting time was essential in the performance of the characteristics that determine the quality of meat.
Relationship Between Management Factors and the Occurrence of DFD Meat in Cattle
Cristina Perez Linares,Fernando Figueroa Saavedra,Alberto Barreras Serrano
Journal of Animal and Veterinary Advances , 2012,
Abstract: A total of 26 management factors that affect the occurrence of DFD meat, were evaluated. Data was obtained in a local feedlot and at a Federal Inspection Type slaughter plant during the months of December to March. Three different weekly questionnaires were taken to get information about managing practices before slaughtering at five random visits to the feedlot. Managing practices were grouped according to feeding pens, transport, situation before slaughtering and staying at the slaughter plant. Two hundred and thirty-three carcasses between 18 and 24 h post mortem were chosen at random and pH, color (L*, a* and C*) were recorded for the classification of meat as normal, dark, or DFD. Dark meat was not detected. The relationship between managing factor and the occurrence of DFD meat was evaluated based on Odds Ratio (OR), estimated by 2x2 contingency tables. The percentage of DFD meat was 8.15%; the variables favoring the occurrence of DFD meat were: Cattle herding time to get on the transportation facilities of more than 35 min (OR= 10.53), environmental temperature above 16 C; using a plastic stick for cattle driving (OR=20.25), joining animals of different stockyards on the transport (OR= 34.23) and keeping the cattle for more than 19 h in the rest pen (OR= 11.13). Changes in ante mortem managing practices are suggested in order to minimize the occurrence of DFD meat.
Adición de grasa suplementaria en sustitución de forraje en dietas para vacas en lactancia: Digestión de nutrimentos y función ruminal
Alejandro Plascencia Jorquera,Alberto Barreras Serrano,Richard Avery Zinn
Veterinaria México , 1999,
Abstract: Cuatro vacas Holstein primíparas (529 kg), habilitadas con cánulas en rumen y duodeno proximal fueron utilizadas para evaluar el efecto de los tratamientos sobre utilización de nutrimentos y función ruminal. Los periodos experimentales constaron de 21 días, 17 para adaptación a la dieta y 4 para toma de muestras. Las vacas consumieron dietas tipo integral en intervalos iguales dos veces por día. Los tratamientos fueron: 1) sin grasa suplementaria; 2) 4% de grasa amarilla, sustituyendo a 4% de maíz hojueleado; y 3) 4% sustituyendo a 4% de heno de alfalfa (BMS). No hubo efecto (P>0.10) de los tratamientos sobre pH ruminal, digestión ruminal y posruminal de N, MO y almidón. El tratamiento 3 tendió a disminuir (18%, P>0.20) la digestión de FAD a nivel ruminal. La adición de grasa a la dieta aumentó (P<0.10) la ED de la dieta, así como el flujo a duodeno del N consumido, y disminuyó (P<0.10) la digestión de MO a nivel de tracto total y la proporción molar de propionato. El valor de la ED (Mcal/kg)para la grasa amarilla promedió 7.54 Mcal/kg cuando fue sustituida por maíz, y 6.62 cuando se sustituyó por forraje. Se concluye que la suplementación de grasa puede ser mediante la sustitución del concentrado o el forraje, sin efectos negativos sobre la proporción de AGV ruminales, o sitio y tasa de digestión de MO, FAD, N, almidón y lípidos. Sin embargo, el adicionar a la dieta 4% de grasa en sustitución por forraje, tendió a disminuir el valor nutrimental de la grasa suplementaria en 12%.
Evaluation of Changes in Management Practices on Frequency of DFD Meat in Cattle
Alma Patricia Sotelo Flores,Cristina Perez Linares,Fernando Figueroa Saavedra,Alberto Barreras Serrano,Eduardo Sanchez Lopez
Journal of Animal and Veterinary Advances , 2012,
Abstract: Five modifications in ante mortem management practices were evaluated in their association with the presence of DFD meat. The study was done in winter in 2 feedlots in Mexicali, Baja California, using information from 400 animals organized in 2 2 tables. The results show 30.27% of DFD meat. Moreover, temperatures above 16 C during driving, the use of the whip instead of the plastic goad and longer waiting time in rest pens continued to be factors related themselves (p<0.05) with the presence of DFD meat. Non-mixing animals among pens for their transportation as well as the total waiting time prior to slaughter resulted non-associated (p>0.05). The high percentage of DFD meat during winter, even with changes in management practices, makes it necessary to continue evaluating practices of animal wellbeing in searching of decreasing the amount of DFD meat.
Identification of Listeria sp. in Hams and Frankfurters Products Exhibited for Sale
Laura Elena Silva Paz,Cristina Perez Linares,Alberto Barreras Serrano,Fernando Figueroa Saavedra
Journal of Animal and Veterinary Advances , 2012,
Abstract: The aim of this study was to analyse the occurrence of Listeria species in frankfurters and hams products packed under vacuum and exhibited for sale in Mexicali, Baja California. One hundred and eighty-two packages of frankfurters and 72 of hams belonging to 17 commercial brands were collected randomly among packages exposed for sale, according to simple randomized sampling. The sampling was carried out between May and November. Positive samples of Listeria were submitted to biochemical tests in order to differentiate and confirm their species. Sixteen point five percent (42/254) presented some species of Listeria: 19.2% in frankfurters (35/182) and 9.7% in hams (7/72) products. L. monocytogenes was identified from 19 of 182 frankfurters and only 1 of 72 hams products analysed. Other species of Listeria were detected in 16 frankfurters samples (8.8%) and in 6 of the hams (8.3%). Presence of L. monocytogenes in these kinds of meat products, specifically frankfurters product, suggest inefficiency and inefficacy in the microbiological control programs during the process of elaboration. Thus, it should be considered possible source of listeriosis.
Seroprevalence and Risk Factors Associated with Larva Migrans of Toxocara canis in Dogs from Mexicali Baja California, Mexico
Luis Tinoco-Gracia,Alberto Barreras-Serrano,Gilberto Lopez-Valenci,Alma Rossana Tamayo-Sosa
Journal of Animal and Veterinary Advances , 2012,
Abstract: We conducted a cross-sectional study to estimate the seroprevalence to larva migrans of Toxocara canis in dogs of the urban area of Mexicali Baja California, México, for a 12 month period, from dogs attended at private veterinary clinics. Also, the risk factors associated with the seropositive values were evaluated. Sera were tested for antibodies to larva migrans of T. canis using a commercially available ELISA test. The dog owners were interviewed utilizing an epidemiologic questionnaire about sex, size, age, anthelmintic treatment, place where dog lives, access of dog to the street and number of dogs in the house. An adjusted seroprevalence of 56.1% (95% CI 49.6-62.5%) was obtained, while the apparent prevalence was 57.8%. Seroprevalence values were found to differ significantly (p<0.05) among dogs according to age and size. The risk factors associated with seroprevalence to T. canis were the number of dogs in the house and the access of dogs to the street, with OR of 1.90 (p<0.01) and 2.42 (p<0.01), respectively. The high seroprevalence of T. canis found in the present study suggests that dogs may constitute an underestimated risk of transmission for the human population and also emphasizes the importance of maintaining a periodic deworming calendar for dogs, limit the access of dogs into public parks, as well as educating dog owners about removing dog feces from public places.
Afecciones quirúrgicas del esófago y cardias: Estudio de una década
Raúl Saa Vidal,Orestes N Mederos Curbelo,Juan Carlos Barreras Ortega,Carlos Alberto Romero Díaz
Revista Cubana de Cirugía , 2002,
Abstract: Se presentan 109 enfermos con afecciones de esófago y cardias, a los cuales se les realizaron intervenciones quirúrgicas en la última década del siglo xx, en el Hospital Universitario "Comandante Manuel Fajardo" y que representan el 0,47 % de todas las intervenciones electivas mayores. El 74 % era del sexo masculino y el 84 %, superior a la cuarta década. El 61,4 % tenía afecciones malignas, de ellas irresecables el 46,2 %. La mortalidad quirúrgica fue de 4,5 % y los problemas relacionados con la sutura el 4,1 %
Influencia de una enzima fibrolítica exógena y el proceso de maceración en un forraje de baja calidad sobre digestión y función ruminal en vacas Holstein secas
María Alejandra López Soto,Eduardo Arellano González,Alberto Barreras Serrano,Víctor Manuel González Vizcarra
Veterinaria México , 2006,
Abstract: Se utilizaron cinco vacas secas Holstein (633 ± 81 kg) canuladas para evaluar la posible interacción de una enzima fi brolítica exógena y el procesamiento de maceración de la paja sobre las variables de digestión y función ruminal. Los tratamientos consistieron en un concentrado formulado a base de maíz complementado en proporción de 40% con alguno de los siguientes forrajes: heno de sudán molido, paja de arroz molida sin y con enzima (15 g/d) y paja de arroz macerada sin y con enzima (15 g/d). No hubo efecto (P > 0.10) de los tratamientos sobre el consumo de materia seca. La combinación de enzima y macerado aumentó (interacción, P < 0.05) la tasa de digestión ruminal de la fi bra detergente neutro (FDN) y la digestión a nivel de tracto total de la fi bra detergente ácido (FDA). La adición de la enzima aumentó (P < 0.05) la digestión ruminal de la materia orgánica, de la FDA y de la FDN, sin efectos (P > 0.10) sobre la digestión a nivel de tracto total. La maceración disminuyó la digestión ruminal (P < 0.05) y digestión aparente en tracto total (P < 0.01) del nitrógeno consumido. Aun cuando la maceración tendió a disminuir (P = 0.06) la digestión ruminal de la FDN, de esa fracción a nivel de tracto total, resultó incrementada (P < 0.05). El macerado aumentó (P < 0.01) la tasa de pasaje y la tasa de digestión de la fracción de FDN en rumen y disminuyó el contenido de los sólidos (P < 0.01) y de la FDN en ese sitio (P < 0.01). Mientras que la enzima sólo aumentó la tasa de digestión de la FDN (P < 0.01). Se observó mayor digestión en tracto total (P < 0.05) de la MO, FDN y energía bruta (3%, 19% y 4%, respectivamente) para la dieta con heno de sudán, resultando en mayor aporte de energía digestible (P < 0.01). No hubo efecto de los tratamientos sobre el pH ruminal o en los perfi les de ácidos grasos volátiles. Se concluye que las enzimas fi brolíticas exógenas funcionan en forma sinérgica a la maceración, resultando en mejoría en el valor nutrimental en el forraje de baja calidad.
Esophageal substitutions in children. Sustituciones esofagicas en el ni o.
Pedro A. Vilorio Barreras
MediSur , 2007,
Abstract: Esophageal replacements in children usually are necessary in patients with of esophageal atresia or those develop inflammatory scars after consumption of caustic substances. For the substitutive procedure diverse organs are employed, like small or thick intestine and stomach. We presented the Good Clinical Practices Guideline for Esophageal replacement, approved by consensus in the the 3th National Good Clinical Practices Workshop in Pediatric Surgery (Camagüey, Cuba; February 23 - 26, 2004). Las sustituciones esofágicas en ni os frecuentmente son necesarias en pacientes portadores de atresia esofágica y en aquellos que desarrollan cicatrices inflamatorias posteriores a ingestión de sustancias cáusticas. Para el procedimiento sustitutivo se emplean diversos órganos, como intestino delgado, grueso y estómago. Se presenta la Guía de Buenas Prácticas Clínicas para sustituciones esofágicas, aprobada por consenso en el 3er Taller Nacional de Buenas Prácticas Clínicas en Cirugía Pediátrica (Camagüey, 23 al 26 de febrero de 2004).
Diversidad genética en cerdos criollos mexicanos con genes candidatos asociados a características productivas
Sarabia, Alejandro Antonio González;Flores, Clemente Lemus;Martínez, Karina Mejía;Carpena, Javier Germán Rodríguez;Benítez, Maria Guadalupe Orozco;Serrano, Alberto Barreras;
Pesquisa Agropecuária Brasileira , 2011, DOI: 10.1590/S0100-204X2011000100006
Abstract: the aim of this study was to compare the genetic variability and diversity, and genetic distances between mexican creole pigs - pelón mexicano (cpm) and cuinos (cc) - with the commercial breed yorkshire for the candidate genes cast, decr1, hal, hfabp4, lep, lipe, mcr4, myog, rn and chx, using the pcr-rflp technique. one hundred eighty pigs (59 cpm, 65 cc and 56 yorkshire) were evaluated. gene and genotypic frequencies, heterozygosity, genetic distances and filogenetic trees between breed groups were analyzed. in the comparison among the three breeds, the allelic and genotypic frequencies were different for cast, decr1, hfabp4, lep, mcr4 and chx. for lipe, cc pigs were similar to yorkshire; while for myog, the cpm were similar to yorkshire breeds. there were no differences in the genic and genotypic frequencies for hal and rn genes between creole and yorkshire populations. the yorkshire breed had higher favorable allele frequency for cast, lipe, mcr4 and myog, smaller for decr1, hfabp4, and for chx, and moderate for lep genes. the heterozygosity average for all genes was higher in cpm (0.42±0.05) and similar in both the cc (0.33±0.06) and yorkshire (0.35±0.05) breeds. in the estimation of genetic distances considering all genes, the cc breed are more distant from the yorshire pigs.
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