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Huerta-Pena J.C.,University of Veracruz | Martinez-Herrera D.I.,University of Veracruz | De Jesus Peniche-Cardena A.E.,University of Veracruz | Villanueva-Valencia M.,University of Veracruz | And 5 more authors.
Tropical and Subtropical Agroecosystems | Year: 2011

The objective of the study was to determine the seroprevalence and risk factors associated with caprine neosporosis in five municipalities of the central region of the state of Veracruz, Mexico, through a multistage and stratified study. A total of 182 animals from 26 production units (PU) were included, with a sampling fraction of six animals per PU. The PU were selected by clusters according to the tables by Cannon and Roe. Neosporosis was diagnosed through the ELISA test. Seroprevalence was determined by VassarStats® and the risk factors by odds ratio (OR). Overall seroprevalence was 3.8 %, by affected municipalities 60 %, and by PU 15.4 %. The municipality of Coacoatzintla was a risk factor for the infection (OR = 5.95; CI 95%: 1.27 - 27.94), whereas Coatepec and Chiconquiaco, as well as the bucks, were protective factors (OR = 0; CI 95%: 0 - 0). In conclusion, neosporosis in goats had a low seroprevalence but a medium distribution within municipalities and PU. Goats in Coacoatzintla were 5.9 times more likely to become infected with Neospora caninum, whereas goats from Coatepec, Chiconquiaco and the bucks, were protective factors.

Ruiz-Alvarez O.,Instituto National Of Investigaciones Forestales | Arteaga-Ramirez R.,National Autonomous University of Mexico | Vazquez-Pena M.A.,National Autonomous University of Mexico | Ontiveros-Capurata R.E.,National Autonomous University of Mexico | Lopez-Lopez R.,Instituto National Of Investigaciones Forestales
Tecnologia y Ciencias del Agua | Year: 2012

In rainfed agriculture, information about dates for the onset of rainy periods is used to plan activities inherent to exploitation, and even determines the success or failure of crops. The results are partially reflected after planting (germination) and at harvesting time. Dry periods are another very important factor to the agricultural cycle, causing poor germination, stunted growth, deficient development and considerable reductions in yield. Therefore, an analysis was performed at the onset of the growing season in Tabasco in order to identify different levels of probabilities for the dates for the beginning of this period. The frequency of 7-day dry periods was also studied (defined by a threshold of l mm) using daily rainfall and evaporation information from 18 weather stations in the state. A relationship was found between the average start of the growing season with the latitude and average annual rainfall. This was corroborated by a linear regression analysis, in which values for r2 of 0.6884 and 0.8112 were found for each case. The earliest dates for the beginning of the growing season relate to low probabilities for the onset of the rainy season; Tabasco has three regions in which the beginning of the growing season (80%) is distinctly affected by the occurrence of 7-day dry periods.

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