<p><strong>Background</strong>. The production of ruminants in the tropics is based on the grazing of grasses, which present variations in their nutrient content depending on the intensity and frequency of cutting. <strong>Objective.</strong> To determine the effect of cutting intensity and regrowth age of the morphological composition of three hybrids of the genus <em>Urochloa sp</em> on gas production and <em>in vitro</em> gas production kinetics. <strong>Methodology</strong>. The samples were formed by the interaction of three morphological-hybrids (Cobra, Cayman and Mulato II-leaf and stem), two cutting intensities (10 and 15 cm) and 5 regrowth ages (7, 21, 35, 49 and 63 d). Partial and accumulated gas production, maximum volume (V), gas production rate (S) and Lag time (λ) were determined for the samples. The statistical design was a 6 x 2 x 5 factorial arrangement within a completely randomized design. <strong>Results</strong>. The leaves and stems of Cobra and Cayman showed the highest partial and cumulative <em>in vitro</em> gas production (p<0.05). The evaluated variables were not affected by the cutting intensity and the behavior in the <em>in vitro</em> tests was greater at 21 and 35 days of regrowth of the pastures. <strong>Implications</strong>. The cut intensity variable did not modify the mean values of the variables evaluated in this research work, while age negatively affects it. <strong>Conclusions</strong>. The leaves and stems of Cobra and Cayman grasses showed the highest partial and cumulative <em>in vitro</em> gas production.</p>
El objetivo del presente estudio fue evaluar las características testiculares de machos ovinos púberes que consumen hojas frescas de L. leucocephala. Se utilizaron 20 machos ovinos criollos de 5 meses de edad con peso promedio de 24.4 ± 3.21 kg, alojados en corraletas individuales con bebedero y comedero. El experimento duró 120 d. En los que 10 machos fueron alimentados con una dieta 0 % Leucaena (control) y otros 10 machos fueron alimentados incluyendo 25 % de L. leucocephala fresca (Leucaena). Se determinó el consumo real de Leucaena por diferencia entre la cantidad que se ofreció y la cantidad que se rechazó. Para la determinación en sangre de testosterona y mimosina se empleó un kit de ELISA y HPLC respectivamente. Se tomaron medidas de circunferencia escrotal y se estimó el volumen testicular. Se realizó un estudio histológico; para determinar la integridad del parénquima testicular. Las medidas testiculares fueron similares en ambos tratamientos. Un 40 % de los machos consumiendo L. leucocephala presentó edema intersticial y atrofia tubular en el parénquima testicular de ovinos púberes. La circunferencia escrotal y volumen testicular no se vieron afectados, sin embargo, se encontró edema y atrofia de los túbulos seminíferos en los animales que consumieron Leucaena leucocephala.
Objetivo: Determinar la tasa de prevalencia y recurrencia de infección por TVT en perros con propietario y la distribución de la enfermedad en Cuajinicuilapa, Guerrero, México. Métodos: Estudio observacional, descriptivo y longitudinal. Se investigó la presencia de TVT en todos los perros de la comunidad con base en la historia clínica, examen físico y evaluación citológica, y el diagnóstico se confirmó por histopatología. Se retiraron quirúrgicamente muestras de tejido para análisis histopatológico y, cuando se requirió, para eliminar los tumores y tratar con vincristina; se identificaron posibles agrupaciones espaciales por GPS. Todos los casos se reevaluaron un año después. Resultados: Se encontró una prevalencia de 5.15% en 1047 perros (512 hembras y 535 machos; 25 hembras positivas y 29 machos positivos). La infección por TVT fue más frecuente en perros de 2-3 años. Se observó un patrón de agregación espacial en los casos locales. No hubo lesiones en los 29 animales tratados un año después. Conclusión: El TVT es una enfermedad común, y su distribución sugiere su agregación en ciertas áreas de la comunidad. Se requieren más estudios sobre la dinámica de la población de perros en ciudades pequeñas.
O Objective. To determine the presence of microlithiasis in bulls from the Costa Chica, Guerrero, Mexico, and to assess the sperm quality of the bulls affected by this pathology. Methodology. Seventy-seven bulls were assessed in four municipalities of the state of Guerrero, Mexico. Bull testicles were subjected to an ultrasonography test and, in the event of microlithiasis, they were classified according to the number of points observed. In addition, semen was collected by electroejaculation. Sperm concentration (x106 sperm mL-1) and individual motility (%) were quantified from the samples. Microlithiasis results are expressed as a percentage of the total number of assessed animals. Seminal characteristics were subjected to an ANOVA and the means were compared using the Tukey test. Results. Approximately 25% of the assessed individuals showed microlithiasis. About 60% of such cases were classified as grade 2 (> 5, < 25 points). Three microlithiasis grades were identified in Brown Swiss bulls, while in Gyr bulls no grade was identified. Regarding seminal characteristics, in average, the overall sperm concentration was 992.5 x106 sperm mL-1 and the overall individual motility was 75.5%. The bull breed variable did not generate statistical differences in the seminal quality variables. Conclusion. The presence of microlithiasis was identified in bulls from the Costa Chica region in Guerrero; however, sperm concentration and individual motility were not affected.
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