Sistema Regional de Información
en línea para Revistas Científicas de América Latina,
el Caribe, España y Portugal

The aim of this study was to develop and evaluate equations to predict body weight (BW) using heart girth (HG) in Pelibuey ewes. For model develop a data set composed by 366, 3-year-old, non-pregnant and non-lactating ewes; with a mean BW of 45.7±9.16 kg and HG of 87.55± 7.93 cm was used. A linear equation was fitted: BW= -47.97 (±2.01*) + 1.07 (±0.02**)×HG (R2 = 0.86, RMSE = 3.46, , y n = 366). A second data set composed by 67 animals, with similar characteristics (BW of 38.25± 8.62 kg and HG of 80.37± 7.03 cm) was used to evaluate the developed equations. For the evaluation, the relationship between observed and predicted values of BW by linear regression, the mean squared error of prediction (MSEP) and root MSEP (RMSEP), and concordance correlation coefficient analysis were used. The proposed equation was highly precise (r2 =0.913) and accurate (Cb=0.996) with a reproducibility index of 0.95. The MEF have indicates a higher efficiency of prediction with higher proportion of the total variance of the observed values been explained by the predicted data (0.91). The partition of the MSEP have indicated a very small mean bias (0.082). The systematic bias have shown that only 1.93% of the error of prediction was associated with the slope and most of the error was explained by the random component indicating small biases with the predictions. The proposed equation accurately and precisely estimated the BW of Pelibuey ewe using HG and therefore is recommended to be used.

Para determinar el efecto del peso al nacimiento sobre los balances de nitrógeno (N) y energía (E) en cerdos en crecimiento se realizaron balances de N y E a cinco pares de hermanos. Cada par constó de un cerdo de peso bajo al nacimiento (PBN=912 ± 40 g) y un cerdo de peso normal al nacimiento (PNN=1,610 ± 223 g). Los cerdos se manejaron de manera normal hasta los 90 días de edad, cuando se trasladaron a la Unidad Metabólica para realizar los dos estudios de balance: a los 50 kg de peso y a la misma edad (cuando el cerdo PBN pesó 50 kg). Los PNN digirieron más (P<0.05) MS a los 50 kg y a la misma edad (86.9 vs 86.0). La digestibilidad del N tendió (P<0.10) a ser mayor en los PNN a los 50 kg (77.6 vs 76.7) y fue mayor (P<0.05) a la misma edad (78.0 vs 76.7). El N retenido como porcentaje del consumido a la misma edad fue mayor (P<0.01) en los PNN 61.1 % vs 57.7 %; y (P<0.10) en el N retenido como porcentaje del absorbido 78.4 % vs 75.2 %. Se observó una mayor (P<0.05) digestibilidad de la E a los 50 kg en los PNN 85.1 vs 84.1 % y a la misma edad (P<0.01) 85.4 vs 84.1 %. La EM fue mayor a los 50 kg (P<0.05) en los PNN 83.0 vs 82.0 % y a la misma edad (P<0.01) 83.5 vs 82.0 %. Se concluye que los cerdos PBN son menos eficientes que los cerdos PNN.

El objetivo fue comparar los parámetros de comportamiento productivo e ingestivo de ovinos alimentados en sistemas silvopastoriles y confinamiento. Se evaluaron los consumos de materia seca (CMS), de materia orgánica (CMO), de proteína cruda (PC) y de fibra detergente neutro (CFDN), la ganancia diaria de peso (GDP), el tiempo dedicado al consumo (TPC), a la rumia (TPR), a caminar (TPCM) y otras actividades (TPOA), en 18 ovinos con peso inicial de 16.83 ± 2.57 kg, distribuidos en un diseño completamente al azar, con tres tratamientos: dos tipos de sistemas silvopastoriles (SSP): 1) Leucaena leucocephala y Cynodon plectostachyus (L+E); 2) L. leucocephala y Panicum maximum (L+M); 3) Sistema de engorda en confinamiento (SEC). Se realizaron contrastes ortogonales para comparar el SEC vs los SSP y entre los SSP.  Se encontró un mayor (P<0.001) CMS, CMO, CPC, CFDN y GDP en el SEC (1246.2, 1073.0, 157.1, 364.0 y 195 g animal día-1, respectivamente) comparado con los tipos de SSP. Los CMS, CMO, CPC y CFDN fueron mayores (P<0.001) en el L+M (772.2, 662.7, 124.0, 334.2 g animal día-1, respectivamente) que en L+E (548.9, 86.20, 483.0, 252.3 g, respectivamente); aunque la GDP fue similar en ambos SSP (102 y 114 g). El SEC resultó con un menor (P<0.001) TPC (148.33 min) que los SSP. Animales en L+E invirtieron menos (P<0.05) TPC (318.3 min) que en L+M (344.6 min). Animales en SEC utilizan mayor (P<0.001) TPOA (247.9 min) que en los SSP. Sin embargo, el TPOA fue similar entre los SSP.

Management of goats (Capra hircus) in extensive systems is a common practice in the Tehuacán-Cuicatlán Biosphere Reserve (TCBR), Mexico. This study analyzes the similarity in plant consumed by goat flocks in landscape at the Cañada region, Oaxaca. Eight (8) flocks were sampled in different locations during the 2012 rainy season and 2013 dry season. To determine spatial and temporal similarity among the flocks, depending upon the consumed plant species, it was used hierarchical agglomerative clustering methods in the R program. The goats consumed a total of 84 plant species, of which 30 constituted 75 % of the diet. According to the similarity analysis, Mimosa sp. and Acacia cochiliacantha were the species consumed by all flocks in both seasons; while Eleusine indica, Prosopis leavigata and Opuntia sp. were the next most important, depending on the season. The Tecomavaca herd showed lower similarity than the other flocks. The results of the present study contribute to furthering the knowledge regarding the foraging habits of goats in tropical dry regions where the seasonality of the resources is very contrasting.

El Dr. Enrique Alberto Suárez Hernández matriculó en la Universidad de La Habana la carrera de Medicina en 1938 y se graduó en 1945. Ejerció como médico Municipal en Oriente, como médico forense en Banes, médico en Guanabacoa y profesor de Anatomía en la Escuela de Medicina de la Universidad de La Habana.En los años de la clandestinidad, colaboró con combatientes y campesinos que iban a verlo por problemas de salud. Al triunfo revolucionario se incorporó a las Milicias Nacionales Revolucionarias, fue fundador de los Comités de Defensa de la Revolución y miembro de la Central de trabajadores de Cuba. Participó en movilizaciones y trabajos voluntarios.Fundador del Instituto de Ciencias Básicas y Preclínicas “Victoria de Girón”, Profesor Titular de Anatomía.El Dr. Enrique Alberto Suárez Hernández matriculó en la Universidad de La Habana la carrera de Medicina en 1938 y se graduó en 1945. Ejerció como médico Municipal en Oriente, como médico forense en Banes, médico en Guanabacoa y profesor de Anatomía en la Escuela de Medicina de la Universidad de La Habana.En los años de la clandestinidad, colaboró con combatientes y campesinos que iban a verlo por problemas de salud. Al triunfo revolucionario se incorporó a las Milicias Nacionales Revolucionarias, fue fundador de los Comités de Defensa de la Revolución y miembro de la Central de trabajadores de Cuba. Participó en movilizaciones y trabajos voluntarios.Fundador del Instituto de Ciencias Básicas y Preclínicas “Victoria de Girón”, Profesor Titular de Anatomía.

Specimens of Xiphophorus birchmanni (Teleostei: Poeciliidae) (55 individuals) (Sheepshead swordtail) were collected from 2 localities in the Pánuco River drainage from Hidalgo and Veracruz [at Atlatipa (n = 26) and Benito Juárez (n = 29), respectively], Mexico. The structure of the parasite communities of fish from the 2 localities was examined and compared. Helminths from 10 taxa were recovered: 6 species of larval digeneans (Posthodiplostomum sp., Uvulifer sp., Centrocestus formosanus, Ascocotyle sp., Haplorchis pumilio, and Echinostomatidae gen. sp.); 2 adult monogeneans (Urocleidoides vaginoclastrum and Gyrodactylus sp.); 1 larval cestode (metacestode stage; Glossocercus auritus); and 1 larval nematode, Eustrongylides sp. Urocleidoides vaginoclastrum and C. formosanus were the most frequent and abundant species. The remaining taxa were rare and found at low mean abundance. Component community and infracommunity differences observed in this study could be attributed to abiotic and biotic environmental factors resulting from the geographic separation of these localities during the orogeny of the Sierra Madre Oriental that restricted fish to isolated localities.

The cultivation of common bean (Phaseolus vulgaris L.) in Mexico occupies the third place by established surface, although the production reports annual variations due to the heterogeneity of the climatic conditions in which it is produced. Given the cultural and nutritional importance of this legume, farmers and geneticists have selected cultivars with desirable culinary characteristics and adaptations to restrictive environments. The objective was to characterize the germination of bean cultivars collected in the Central Valleys of Oaxaca and the Potosino Altiplano, regions with contrasting environments and culture. In the Phytochemistry laboratory of the Desert Areas Research Institute, during the summer of 2015, five traditional cultivars and ten improved bean cultivars were evaluated. The percentage of germination was quantified with the procedures of the standard test described by ISTA (2005) and the seeds that showed lower incidence of fungal contamination and higher percentage of germination were selected. With four improved cultivars and four traditional cultivars, the average weight of a sample of 100 seeds and the proportion of seminal structures were determined. The effect of three osmotic potentials on germination was also recorded (Ψo: 0, -0.5 and -1.1MPa). Differences (p≤ 0.05) were observed in the weight of 100 seeds, the percentage of the testa and the embryonic axis. In Ψo: 0.0 Mpa and -0.5 Mpa, differences were obtained (p≤ 0.05) among the cultivars evaluated. In Ψo: -1.1 Mpa germination was null in all cultivars.

The diversity of maize (Zea mays L.) in Mexico is wide and there is still a need to carry out works that allow to discern the variation within and between racial groups and establish collections of racial reference for their understanding. The morphological diversity of representative populations of 10 mexican maize races was assessed. In the spring-summer cycle of 2010, experiments were established with 88 representative accessions of Bofo, Celaya, Coscomatepec, Dulce de Jalisco, Elotes Occidentales, Mushito, Palomero de Jalisco, Serrano de Jalisco, Tablilla de Ocho, and Zamorano Amarillo races, in the localities of Roque, Guanajuato and Ciudad Guzmán, Jalisco, under an experimental design of incomplete blocks, 30 morphological characters were measured. The analysis of variance indicated significant differences among the accessions for all the characters (variables). The repeatability analysis showed that 16 characters had a coefficient ≥ 3.0, these were the least affected by the environment. In the analysis of main components and conglomerates, variation within and between races was observed, with a continuous dispersion, but which allowed the identification of four racial complexes. Group I was made up of accessions mainly from Bofo, Celaya II, Dulce de Jalisco III and Elotes Occidentales IV, the remaining races are mostly added in group II as subgroups. This study confirmed clustering of accessions in well-defined races and represented in germplasm banks. It is necessary to conduct deeper studies in races with few accessions to achieve a better racial definition.

This paper describes a methodical approach to hydrogeologic mapping and outlines principles of data management using Geographic Information Systems. Digital hydrogeologic maps and their underlying data base are well suited for water resources planning. The concept of the digital hydrogeologic map presented in this article focuses on the occurrence of productive aquifers and visualizes them by an “x-ray view” in the base map that outlines hydraulic conductivity at groundwater level. Additional hydrogeologic cross sections reveal the vertival distribution of hydraulic conductivity as well as the thickness of productive strata and their tectonic setting. Regional hydrogeology can be presented by at least three different layers of information that can be supplied in separate sheets: hydrogeological base map, hydrogeological cross sections, groundwater contour map. A Geographic Information System serves as a platform of integration for digital maps around which available data are centered. The application of a GIS and a subsequent georelational database allows data capture, processing, analysis, and visualization in support of decision making.

Late Cenozoic strata distributed along the coastal region of the Sea of Japan are a good recorder of transgression and regression events in the Paleo-Sea of Japan. The main events are recognized from many stratigraphical horizons of Niigata late Cenozoic formations. They are early/middle Miocene transgression; 2) latest Miocene / early Pliocene events; 3) late Pliocene to early Pleistocene transgressions and regressions; 4) middle to late Pleistocene transgressions and regressions; and 5) Holocene It is thought that the events were related to global sealevel changes, crustal movements and local landform changes.