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Victoria de Durango, Mexico

Reyes Estrada O.,Universidad Juarez del Estado de Durango | Murillo Ortiz M.,Universidad Juarez del Estado de Durango | Herrera Torres E.,Universidad Juarez del Estado de Durango | Gurrola Reyes J.,CIIDIR IPN | Juarez Reyes A.,Universidad Juarez del Estado de Durango
Journal of Animal and Veterinary Advances | Year: 2010

We used four ruminally cannulated steers (350±3 kg) to evaluate the effect of season on chemical composition, intake, kinetic, digestibility and ruminal fermentation of diet selected during grazing. Data were analyzed as a randomized complete block design with months as the block and season of year as treatment. Time-sequence data than pH, ammonia Nitrogen (NH3N) and Volatile Fatty Acids (VFA) were analyzed as repeated measures within a randomized block design. The Dry Matter Intake (DMI), Organic Matter Intake (OMI), Digestible Energy (DE), Metabolizable Energy (ME) and passage rate (Kp) of diet were affected by season (p<0.05). The Crude Protein (CP) and NH3N concentration were higher in the rain season (p<0.01). The content of NDF was different in seasons (p<0.01). Similar, acetate, propionate and butyrate concentrations were different (p<0.01). Changes in chemical composition, intake, kinetic, digestibility and ruminal fermentation observed in this study appeared to be related to season. © Medwell Journals, 2010.

Murillo M.,Mexico State University | Herrera E.,Mexico State University | Reyes O.,Mexico State University | Gurrola J.N.,CIIDIR IPN | Gutierrez E.,Autonomous University of Nuevo Leon
African Journal of Agricultural Research | Year: 2011

This study evaluated the seasonal changes in the in vitro gas production of diets consumed for grazing steers. The gas produced by the soluble fraction "a" and insoluble but slowly fermenting fraction "b", were highest in summer and fall (p<0.01). The constant gas production rate "c" was affected by season of the year (p<0.01). The organic matter digestibility (OMD) and short chain fatty acids (SCFA) was affected by season of the year (p<0.05). The in vitro gas production is a good indicator of the nutritive quality diet consumed by grazing cattle. © 2011 Academic Journals.

The quantitative importance of rainfall interception loss and the performance of the reformulated Gash model were evaluated as a function of basal area in Mexico's northeastern temperate forest communities. A sensitivity analysis as well as an iterative search of parameters matched interception loss measurements and assessments and isolated coefficient values that drive the model performance. Set hypothesis was tested with a total of 73 rainfalls recorded on four forest stands with different canopy cover for model fitting (39) and validation (34). The reformulated Gash model predicted well rainfall interception loss because mean deviations between recorded and modelled interception loss as a function of gross rainfall, MD, were <2.6% and 5.3% for fitting and validating parameter data sets, respectively. Basal area was negatively related to the model performance, but maximum projected MD range values can be found in most interception loss studies, for example, <7% when basal area is <5m2ha-1. The wet canopy evaporation rate and the canopy storage coefficient drive interception loss and the iterative parameter search showed that high wet canopy evaporation rates were expected in these forests. These parameters must be further studied to physically explain drivers of high wet canopy evaporation rates. Copyright © 2012 John Wiley & Sons, Ltd.

Troconis-Torres I.G.,National Polytechnic Institute of Mexico | Rojas-Lopez M.,Research Center en Biotecnologia Aplicada | Hernandez-Rodriguez C.,National Polytechnic Institute of Mexico | Villa-Tanaca L.,National Polytechnic Institute of Mexico | And 4 more authors.
Journal of Biomedicine and Biotechnology | Year: 2012

The genus Capsicum provides antioxidant compounds, such as phenolics and carotenoids, into the diet. In Mexico, there is a wide diversity of species and varieties of chilli peppers, a fruit which has local cultural and gastronomic importance. In the present study, the relationship of the carotenoid and phenolic profiles with the RAPD fingerprint of three different commercial cultivars of chilli peppers of seven regions of Mexico was investigated. Through RAPD, the species of chilli were differentiated by means of different primers (OPE-18, MFG-17, MFG-18, C51, and C52). The genetic distance found with OPE 18 was in the order of 2.6. The observed differences were maintained when the chromatographic profile of carotenoids, and the molecular markers were analyzed, which suggest a close relationship between carotenoids and the genetic profile. While the chromatographic profile of phenols and the molecular markers were unable to differentiate between genotypes of chilli peppers. In addition, by using infrared spectroscopy and statistical PCA, differences explained by geographic origin were found. Thus, this method could be an alternative for identification of chilli species with respect to their geographic origin. Copyright © 2012 Ivonne Guadalupe Troconis-Torres et al.

Gallegos-Infante J.A.,Durango Institute of Technology | Rocha-Guzman N.E.,Durango Institute of Technology | Gonzalez-Laredo R.F.,Durango Institute of Technology | Medina-Torres L.,National Autonomous University of Mexico | And 5 more authors.
Food Bioscience | Year: 2013

The effect of two wall materials and two feed flow rates on the physical and antioxidant properties of Quercus resinosa leaf infusion microencapsulated by spray-drying is reported. Dispersions with lyophilized Q. resinosa infusion and wall material (k-carrageenan and maltodextrin [10 DE]) were prepared. Samples were fed at rate flows of 1.6 and 1.7 L/h. Encapsulation yield, total phenolic content, DPPH test, deoxy-D-ribose assayt, rheological and SEM evaluations were made. The highest yield and DPPH scavenging activity were obtained at 100% maltodextrin and 1.7 L/h. Higher polyphenolic retention was observed in blends of carrageenan/maltodextrin (1.6 and 1.7 L/h) and maltodextrin (1.6 L/h). The highest inhibition of deoxy-D-ribose oxidation was found at blends of carrageenan/maltodextrin (1.7 L/h). Dispersions showed pseudoplastic behavior and properties as liquid-like materials. Microcapsules showed particle sizes between 5 and 35 |im. The best condition for encapsulation of Q. resinosa infusions was suggested as 100% maltodextrin at 1.7 L/h. © 2012 Elsevier Ltd.

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