Grassland-based livestock systems across Mexico’s arid and semi-arid belt are increasingly exposed to drought, degrading forage reliability, and soil function. This review synthesizes evidence on native C4 grasses and forage shrubs as complementary building blocks of drought-resilient swards. We searched Web of Science, Scopus, CAB Abstracts and key grey sources (USDA/NRCS Plant Guides, USFS FEIS, Tropical Forages, SNICS) for 1990–2025 studies in English/Spanish. Dominant native grasses (Bouteloua spp., Hilaria belangeri, Digitaria californica, Trichloris crinita, Sporobolus airoides, Panicum hallii) provide high warm-season digestibility and structural cover via C4 physiology, basal/intercalary meristems, and deep/fibrous roots. Forage shrubs (Atriplex canescens, Desmanthus bicornutus, Leucaena leucocephala, Flourensia cernua, Prosopis spp.) bridge the dry-season protein/energy gap and create “resource islands” that enhance infiltration, provided anti-nutritional risks (mimosine/DHP, tannins, salts/oxalates, terpenoids) are managed by dose and diet mixing. We integrate these findings into a Resistance–Recovery–Persistence framework and translate them into operations: (i) site-matching rules for species/layouts, (ii) PLS (pure live seed)-based seed specifications and establishment protocols, (iii) grazing TIDD (timing–intensity–distribution–duration) with a practical monitoring dashboard (CP targets, stubble/cover thresholds, NDVI/SPEI triggers). Remaining bottlenecks are seed quality/availability and uneven extension; policy alignment on PLS procurement and regional seed increase can accelerate adoption. Mixed native grass–shrub systems are a viable, scalable pathway to strengthening drought resilience in Mexican rangelands.

Background: Bovine brucellosis is a high-impact zoonosis that threatens both dairy productivity and public health. Despite long-standing control programs in Mexico, evidence quantifying its combined productive, reproductive, and economic effects under intensive dairy systems remains limited. Methods: Farm records from two intensively managed Holstein friesian dairies operating under fully confined housing systems in Coahuila (Mexico) were analyzed to compare brucellosis-positive (BR) and brucellosis-negative (SIN) cows across five parities (n = 32,178 lactations; 15,507 BR; and 16,671 SIN). Milk yield, days open (DOs), services per conception (SPCs), days in milk (DIMs), abortion, metritis, retained placenta (RP), and culling to abattoir were evaluated using standard linear and generalized linear models. A financial assessment estimated losses associated with unproduced milk, extra DOs, extra inseminations, abortions, hormonal protocols, feeding during extra DOs, labor, and replacement costs. Results: BR cows consistently produced less milk (−3.5 to −5.0 L·cow⁻¹·day⁻¹) and exhibited longer DOs (+10 to +34 days) and higher SPCs (+0.4 to +1.0 in four of five parities; p < 0.05). Abortion incidence was higher in BR cows (1.74–2.79%) than in SIN cows (0.69–1.59%). Estimated total economic losses reached USD 21.84 M, including unproduced milk (USD 10.20 M), extended DOs (USD 1.36 M), feed cost during extra DOs (USD 0.68 M), additional services (USD 0.21 M), hormonal protocols (USD 0.10 M), labor (USD 0.06 M), abortions (USD 0.05 M), and excess replacements (USD 0.19 M). Conclusions: Under endemic conditions, brucellosis markedly reduces dairy herd productivity and reproductive performance. Strengthened sanitary control, enhanced biosecurity, strategic culling of positive animals, and structured reproductive programs represent the most cost-effective pathway to recover milk, shorten DOs, and minimize abortions.

La investigación se realizó en la Unidad Académica de Medicina Veterinaria y Zootecnia, de la Universidad Autónoma de Zacatecas (UAMVZ-UAZ), cuya finalidad fue identificar los motivos y porcentaje de deserción escolar de los alumnos que cursan la licenciatura en Medicina Veterinaria y Zootecnia en el periodo comprendido 2018-2022. Se presentan resultados de las entrevistas aplicadas a un total de 35 alumnos los alumnos de la licenciatura de MVZ, las cuales fueron desarrolladas durante ese periodo, por lo que se abarcó al 100% de los alumnos que desertaron. Los motivos principales de deserción fueron: 1. Carencias económicas. 2. Falta de vocación. 3. La pandemia por SARS-CoV-2. 4. perdidas de familiares, 5. Falta de internet en sus municipios y comunidades. Este resultado fue revisado con la información oficial en base a los datos proporcionados por el personal del Departamento escolar, bajo la supervisión del responsable de programa de licenciatura de la carrera de Medicina Veterinaria y Zootecnia, encontrando que, de un total de 1100 alumnos de los diferentes semestres, en el periodo del año 2018 al 2022, encontrando que solo un 3.1 % de los alumnos desertaron.

The objective of this study was to evaluate the effects of zilpaterol hydrochloride supplementation strategies on growth performance, dietary energetics, carcass traits, and meat quality in feedlot finishing lambs. Twenty-four Dorper × Katahdin crossbred male lambs (45.5 ± 4.53 kg, mean ± SD) were used in a 27 d feeding trial. The zilpaterol supplementation strategies were: (1) control, no zilpaterol supplementation (CON); (2) zilpaterol administered once daily as a full dose in the morning feeding (ZMOR); (3) zilpaterol incorporated into the total mixed ration and continuously available throughout the day (ZMIX); and (4) intermittent zilpaterol supplementation applied in a daily alternating pattern, one day on, one day off (ZINT). A target dose of 0.20 mg/kg live weight of zilpaterol hydrochloride per administration was used for all supplemented treatments, with daily administration in ZMOR and ZMIX and alternate-day administration in ZINT. Compared to the CON, zilpaterol supplementation through the ZMOR + ZMIX strategies improved average daily gain (ADG) and feed efficiency (FE) by 28.6% and 18.5%, respectively. Additionally, dressing percentage and longissimus thoracis muscle area increased by 3.2% and 17.0%, respectively. The ZINT strategy also enhanced ADG by 20.9% and FE by 15.4%. However, ZINT did not improve hot carcass weight or dressing percentage. All zilpaterol supplementation strategies increased meat toughness by up to 39.2%. Results indicate that both the ZMOR and ZMIX strategies optimize the response to zilpaterol, with no evidence that ZMOR supplementation results in a diminished response.

El estudio titulado Identificación y Análisis de Estrategias de Educación Intercultural como base para el Desarrollo Académico y Social en México, tiene como objetivo identificar y analizar las estrategias fundamentales para la implementación efectiva de la educación intercultural en los centros educativos del país. Para llevar a cabo esta revisión de literatura, se realizó una recopilación exhaustiva de fuentes académicas, incluyendo artículos científicos, libros, informes de instituciones, tesis y recursos digitales de bases de datos como JSTOR y Scielo, priorizando trabajos publicados en los últimos cinco años. Se adoptó un enfoque cualitativo, realizando un análisis de contenido que permitió categorizar las estrategias en áreas como metodologías pedagógicas, políticas educativas y desarrollo de competencias interculturales. Los resultados identificaron diversas estrategias clave para la educación intercultural, tales como la interpretación y organización de la diversidad en el aula, la promoción de actitudes positivas hacia las diferencias culturales, la interconexión de la cultura con el currículo de manera transversal, y la educación para el respeto y el diálogo. También se destacó la importancia de cuestionar prejuicios, fomentar la inclusión cultural, desarrollar materiales didácticos inclusivos, ofrecer formación continua a los educadores, y diseñar métodos de evaluación inclusiva. Además, se subrayó la relevancia de fomentar proyectos colaborativos entre estudiantes de diferentes orígenes culturales. En conclusión, este estudio enfatiza que la implementación de estrategias efectivas para la educación intercultural es esencial para crear un ambiente inclusivo que favorezca la integración y participación activa de todos los estudiantes, preparando así a los alumnos como ciudadanos globales competentes en un mundo diverso.

This study determined the level at which corn stover (CS) could be progressively replaced with condensed tannin-containing woody biomass (CTWB) from Quercus rugosa without compromising dietary acceptance, growth, energy utilization, or reproductive development in prospective breeding ram lambs. In Experiment 1, eight intact Rambouillet ram lambs (5 months old; 40.7 ± 0.2 kg initial body weight) were simultaneously offered diets containing 0–80% CTWB (CTWB-0–CTWB-80), equivalent to 0.00–20.96 g condensed tannins (CT)/kg dry matter (DM), in an 8-d preference trial. In Experiment 2, 36 intact Rambouillet ram lambs (6 months old; 49.97 ± 0.79 kg initial body weight) were assigned for 70 d to diets containing 0–60% CTWB and a calculated CT contribution from CTWB of 0.00–15.72 g/kg DM (n = 9/treatment). In the preference trial, CTWB-20 reduced CS from 80 to 60% without affecting the proportion of diet consumed or relative palatability index compared with CTWB-0, whereas inclusions ≥40% reduced both responses (p = 0.0143 and p = 0.0146, respectively). In the growth trial, CTWB-20, corresponding to 5.24 g CT/kg DM from CTWB, maintained growth performance comparable with CTWB-0 and produced a greater overall growth response than CTWB-60, reflected by greater final body weight (63.95 vs. 57.87 kg; p = 0.016), average daily gain (0.202 vs. 0.126 kg/d), cumulative body weight change (14.19 vs. 8.93 kg; p = 0.019), and gain-to-feed ratio (0.094 vs. 0.058; p = 0.011). Dry matter intake (DMI) remained similar (p = 0.278). As CTWB increased, expected DMI increased (p < 0.0001), the observed-to-expected DMI ratio decreased (p = 0.003), and the observed-to-expected net energy for maintenance (NE_m) and gain (NE_g) ratios increased (p ≤ 0.045), although observed NE_m and NE_g concentrations remained unchanged (p = 0.146). Rib fat thickness was maintained with CTWB-20 but decreased with CTWB-40 and CTWB-60 (p = 0.004), whereas longissimus muscle area, scrotal circumference, and sperm motility remained similar (p ≥ 0.157). Additionally, CTWB-20 was associated with greater sperm viability (p = 0.032), while all CTWB levels were associated with fewer morphologically abnormal sperm (p = 0.005). Finally, treatment did not affect income over feed cost or cost of gain (p = 0.217 and p = 0.735, respectively), indicating that partial replacement with CTWB did not adversely affect economic efficiency. Overall, 20% CTWB reduced CS from 60 to 40% and provided a favorable balance among dietary acceptance, growth, semen characteristics, and economic efficiency.