Izquierdo A.V.,Instituto Nacional Of Investigaciones |
Garcia J.A.E.,Instituto Nacional Of Investigaciones |
Gutierrez R.A.,Campo Experimental Zacatepec |
Velasco M.E.A.,Instituto Nacional Of Investigaciones
Revista Mexicana De Ciencias Pecuarias | Year: 2016
The objective of this study was to characterize the types of beekeepers in the state of Morelos, México, based on the use of technology components (TC), and socioeconomic and productive factors in order to generate information to design recommendations to support beekeeping. A questionnaire was designed and applied to a sample of 116 beekeeping units, socioeconomic data and information about TC for colony management, genetics, nutrition and health were obtained, from these information 18 original variables, and 6 technological index were defined and used to stratify the beekeeping productive units (BPU) applying multivariate methods using principal component and cluster analyses. To characterize and compare the resulting beekeeper groups an analysis of variance under a completely random model for continuous variables and a homogeneity test for categorical variables were performed to detect differences between groups. Four factors were detected that explain 70 % of the variance, and because of the factorial load of the variables analyzed, the factors were named as: 1) Productive capacity of the BPU, 2) Health status of the BPU, 3) Beekeeper capacities and 4) Management of the BPU. Three types of beekeepers were identified; small beekeepers with low technological level (55 %), large beekeepers with intermediate technological level (9 %) and medium beekeepers with intermediate technological level (35 %). The typology obtained may be useful to generate differentiated public policies to increase the use of technological innovations to improve the efficiency and productivity of the beekeeping units.
Del Angel-Perez A.L.,Instituto Nacional Of Investigaciones |
Diaz-Padilla G.,Instituto Nacional Of Investigaciones |
Guajardo-Panez R.,Instituto Nacional Of Investigaciones |
Linares- Bravo B.C.,Instituto Nacional Of Investigaciones
Tropical and Subtropical Agroecosystems | Year: 2011
The objective of this study was to obtain landscape fragility indexes (LFI) as a way of acquiring trustworthy data for a sustainable use of soils in the Coatepec- La Antigua basin, in Veracruz, Mexico. For collecting landscape data, an altitude transect was done from 3200 m on the east side of the Cofre de Perote mountain, up to the sea level, close to the city of Veracruz. National forestry inventory data and soil use charts were used along with GIS techniques to generate images showing landscape fragility resulting from soil use. Geographical data were contrasted with socioeconomic characteristics in the region and with the social value of landscapes for the inhabitants. Results show that high LFI (grade 5) correspond to only 2.8% of the landscape; a 22.5% were classified as medium-high (grade 4), and are related to high and medium forest in the mountain range. The most fragile areas are located in the upper parts of the basin, which is coincidental with the highest marginality indexes, the highest population density, and factors of socioeconomic fragility such as international migration fluxes and lower income.
Effects of the release-wash on the motility, vitality and morphology of sperms of low quality [Efectos de la descongelación-lavado sobre la motilidad, vitalidad y morfología de espermatozoides de baja calidad]
Oliva-Hernandez J.,Instituto Nacional Of Investigaciones |
Marcos-Gonzalez M.,Hospital Universitario La Paz
Revista Internacional de Andrologia | Year: 2010
Objetives: The aim of this study was to evaluate the effects of 3 different thawing procedures, as well as the effect of washing, on vitality, motility and sperm tail morphology from poor quality semen samples. Material and methods: Thirteen poor quality semen samples were selected from different patients according to the parameters provided by the Word Health Organization. Samples were thawed according to the following protocols: a) 25 min at room temperature; b) 15 min at room temperature followed by 10 min at 37°C; c) 5 min at 4°C followed by 10 min at room temperature and 10 min at 37°C. In order to study the washing effects all thawed samples were evaluated before and after the washing procedure. Two pellets (150 μl pellet-1) were analyzed for each thawing protocol and vitality, motility and sperm tail morphological alterations were evaluated. Results: The results obtained showed that the thawing protocol did not show any effect (p >.05) on none of the evaluated characteristic. However, washing resulted in decreased (p <.001) vitality, active motility, increased morphological sperm tail alterations (p <.001). Conclusions: These results suggest that washing rather than the thawing procedure could reduce sperm viability in poor quality sperm. © 2010 Sociedad Española de Andrología.