Rafael Alejo Hernández

Autonomous University of Tamaulipas

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Adolfo Hernández

Universidad Complutense de Madrid

Luis Folache

Instituto Nacional de Investigaciones Agricolas

Freddy Espinoza

Instituto Nacional de Investigaciones Agricolas

Madis Põdra

Universitat de Barcelona

Alejandro Gómez

University of North Carolina at Chapel Hill

N. Hernández

Instituto Nacional de Ciencias Agrícolas

J. Lopez de Luruega

Julia Pinedo-Gil

Technological Institute of Castilla y León

Ignacio Durán

Instituto de Investigación Marqués de Valdecilla

David Lacanal

Cooperative Institutions

Universidad Complutense de Madrid

Ministerio de Ganadería Agricultura y Pesca

Colegio de Postgraduados

University of Matanzas

Instituto Nacional de Investigaciones Agricolas

Autonomous University of San Luis Potosí

University of the Philippines Diliman

Instituto de Historia

Universidad EAN

Universitat Politècnica de Catalunya

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Use of a virtual laboratory to improve the understanding of direct current electrical circuits

Adolfo Hernández Rafael Alejo Hernández

The purpose of this project was to analyze a way to improve the understanding of direct current electrical circuits in students of the fourth semester of High School of the College of Bachelors of the State of Hidalgo. The methodology used is based on the constructivist approach, based on problem-based learning. The results obtained show that a large percentage of the students improved their understanding of the topics when doing virtual practices. It is concluded that the teacher can use virtual simulators in institutions where, due to lack of infrastructure, there is no science laboratory

10.35629/5252-0701187191

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Zonal evaluation of tropical pastures introduced in Cuba. 4. Seibabo, dryland agriculture using fertilizers.

Pastos y forrajes (1980)

Rafael Alejo Hernández N. Hernández Alejandra Marín Gómez

Tropical Agriculture

Dryland farming

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Lesions and causes of death of captive-bred European mink (Mustela lutreola) released into the wild

Journal of Comparative Pathology (2023)

Marcelo Aranda Julia Pinedo-Gil David Lacanal J. Lopez de Luruega Ignacio Durán

10.1016/j.jcpa.2023.03.041

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Etología de vaquillas doble propósito en un sistema silvopastoril durante el período seco en una sabana tropical

Zootecnia Tropical/Zootecnia tropical (2008)

Freddy Espinoza Rafael Alejo Hernández Luis Folache

Dry season

Wet season

Ruminating

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Effect of a Yeast Culture on Nitrogen Balance and Digestion in Lambs Fed Early and Mature Orchard Grass

Journal of Applied Animal Research (2009)

Rafael Alejo Hernández S.S. González Juan Manuel Pinos‐Rodríguez M. E. Ortega Adolfo Hernández

Abstract Hernández, R., González, S.S., Pinos-Rodríguez, J.M., Ortega, M.E., Hernández, A., Bueno, G. and Cobos, M. 2009. Effect of a yeast culture on nitrogen balance and digestion in lambs fed early and mature orchard grass. J. Appl. Anim. Res., 35: 53–56. To evaluate the effect of feeding a yeast culture (0 or 5 g/d per sheep) on digestion and N balance in lambs fed orchard grass hay cut at 5 or 16-wk of re-growth, 4 male Criollo lambs (45 ± 4 kg) fitted with ruminal cannulae in a 4x4 Latin square with a factorial 2x2 arrangement of treatments were used. Addition of a yeast culture did not affect (P>0.05) intake, rumen pH and ammonia N, N balance and total tract digestion of nutrients. Ruminal total protozoa changed only according to orchard grass maturity (P<0.05); however, treatments did not affect total and cellulolytic bacteria, rumen pH and rumen ammonia N concentration. It is concluded that addition of a yeast culture to lambs fed early and mature orchard grass did alter ruminal protozoa without affecting feed intake, total tract digestion and N balance.

Digestion

Orchard

Latin square

Nitrogen balance

10.1080/09712119.2009.9706984

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Ethology of double purpose heifers in a silvopastoral system during the dry season in a tropical savanna

Zootecnia Tropical/Zootecnia tropical (2008)

Freddy Espinoza Rafael Alejo Hernández Luis Folache

In order to evaluate the behaviour of double purpose heifers in a tropical dry forest during the dry season, it was carried out a study during the dry season in the municipality of San Jose de Guaribe at North of Guarico state, Venezuela. Treatments were G: Grazing of star grass, Cynodon nlemfuensis , GRA: Grazing of C. nlemfuensis with restricted access to forest, and GFA: Grazing of C. nlemfuensis with free access to the forest. A grazing pressure of 6 kg DM/100 kg LW was used. Seven heifers in G, six in GRA, and 10 in GFA were used in paddocks of 0.5, 0.5 and 3 ha, respectively. The evaluation was made during three days following the activities of the animals: grazing, ruminating, intake of fallen leaves, water drinking, browsing, resting, defecating, and urinating. A design of blocks at random was used, where each animal represented a repetition (three/treatment). The data were analyzed through descriptive statistic. The distribution of the grazing time tended to be different, being higher for G with a total of 53%; whereas in GRA and GFA it varied between 41 and 43%. Animals tended to ruminate prostrated during the nocturnal hours with average of 20%. During the day when the animals entered to the forest, the intake of fallen leaves was the most important activity (9%). Grazing of the animals in G and GRA was around sunrise, whereas in GFA was the intake of fallen leaves. A greater diversity of cycles of grazing was obtained in G. It is concluded that the introduction or use of other consumable plant components by the animals, besides to increase the availability and consumption of dry matter during the dry season, modify the ethology.

Dry season

Wet season

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