RESUMENEn el presente trabajo se propuso y se muestra la aplicación de un nuevo modelo para la enseñanza-aprendizaje de las ciencias morfológicas. El modelo se basa en la representación gráfica de la lemniscata, símbolo aritmético del infinito. El propósito de esta propuesta es aportar una herramienta útil para el desarrollo de la actividad docente de los profesionales vinculados con la enseñanza de las ciencias veterinarias, además de promover en los estudiantes el aprendizaje significativo. El modelo se aplicó en estudiantes del curso de Biología tisular de la Facultad de Medicina Veterinaria y Zootecnia de la Universidad Nacional Autónoma de México. El análisis estadístico de los resultados, que se realizó mediante la prueba de U de Mann Whitney, generó un valor z = 2.49 correspondiente a un nivel de significado p = 0.012 (98.8%), lo que demostró que existen diferencias estadísticamente significativas a favor del grupo experimental en el que se aplicó el modelo propuesto en el presente trabajo.ABSTRACTA new model for the teaching-learning of morphological sciences was proposed. The model is based on the graphic representation of the lemniscate, an arithmetic symbol of infinity. The purpose of the proposal was to provide a useful tool for education and promote meaningful learning. The model was applied in students of the National Autonomous University of Mexico. The statistical analysis was performed using the Mann Whitney U test, generating a value z = 2.49 with a level of significance p = 0.012 (98.8%), which showed that there are statistically significant differences in favor of the experimental group.
MEJÍA, H. N. G.; HERNÁNDEZ, E. J. & PÉREZ-MARTÍNEZ, M.Seminal parameters and sexual behavior on farm rabbits provided with a diet supplemented with canola oil at the start of puberty. Int. J. Morphol., 36(1):59-62, 2018. SUMMARY:In order to evaluate the effect on sexual behavior and spermatic parameters of white New Zealand rabbits, at the onset of puberty, they were fed a standard diet supplemented with canola oil (obesogenic). Two groups were formed; one of which received daily 180 g of a standard commercial diet supplemented with 13 ml of canola oil during 12 weeks, while the second group (control) were fed daily 180 g of only the standard commercial diet. Starting at 20-weeks of age, seminal volume, en masse and individual sperm motility, and sperm concentration per mm 3 were measured from each individual, as well as the behaviors olfactory exploration, chinning, and first and second attempt at mounting were assessed. No significant differences were found between groups in terms of seminal volume, and en masse and individual sperm motility count and percentage (P>0.05). In relation to sexual behavior, the group fed with supplemental canola oil showed reduced the response time to females in the sexual behaviors of chinning, olfactory exploration, and first and second attempt at mounting when compared to the control group (P<0.01). The data indicate that the addition of canola oil to a standard rabbit diet at the start of puberty and continued for 12 weeks increases the body mass index and reduces the response time in sexual behaviors such as olfactory exploration, chinning, and second attempt at mounting when interacting with female stimulus. Nevertheless, the seminal parameters did not show any modification. Other studies are needed to show the benefits or disadvantages of the addition of varying inclusion percentages of other vegetable oils, to evaluate their effects on reproductive efficiency in breeder male rabbits.
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