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Articles by Carlos Cruz-Vazquez
Total Records ( 2 ) for Carlos Cruz-Vazquez
  Ema Maldonado-Siman , Pedro Arturo Martinez-Hernandez , Hector Sumano-Lopez , Carlos Cruz-Vazquez , Raymundo Rodriguez de Lara and Miguel Angel Alonso-Diaz
  Haematobia irritans (Linnaeus) is an economically important pest of livestock. Its infestation causes significant losses in meat and milk production, as well as damaging skin quality. Organic livestock production has increased because of market demands with emphasis on high standards in animal health and welfare and therefore, good production practices are warranted. To achieve this goal, epidemiological studies are needed to devise integrated pest management programs capable of reducing parasite burden to an economic threshold for organic dairy production. Consequently, the objective of the study was to determine Haematobia irritans population seasonality and to relate these changes with weather factors. Field phase was developed in an organic dairy farm located in a Mexican temperate climate throughout a 2 years period (2003 and 2004). Weekly horn fly counts and 4 weathers parameters were measured and correlated for each year and years combined. Flies were found on cattle year round in both years the highest loads were 130 flies cow-1 in 2003 and 255 flies cow-1 in 2004 both in summer. Rainfall showed the highest correlation (r = 0.68) with horn fly in 2004 and for years combined (r = 0.67), while in 2003, it was relative humidity with a correlation of r = 0.75. The lower counts of horn flies on cattle found in winter and early spring were associated with a drier environment and relative lower air temperatures; however, none of the weather factors were severe enough to achieve a complete elimination of flies, the year round presence and summer peaks of flies can be a constraint to animal welfare and production. It was concluded that yearly fly population changes can be associated to weather factors and mild temperatures in winter allows finding flies on cattle year-round.
  Maria Dolores Fuentes Delgado , Irene V. Vitela Mendoza , Beatriz Arellano-Reynoso , Rigoberto Hernandez Castro , Jose Francisco Morales Alvarez , Carlos Cruz-Vazquez , Francisco Suarez-Guemes and Efren Diaz-Aparicio
  The present study was aimed to detect B. abortus DNA from aborted cows and differentiated its vaccinal and/or field origin. The PCR technique was used to identify and differentiate S19, RB51and field strains. The research was performed in a dairy farm located in the state of Aguascalientes, Mexico, with reproductive problems and abortions. Cows were vaccinated when calves with RB51, normal dose and revaccinated with RB51reduced dose 8 months before starting the study. The number of revaccinations of each cow, was not known since it is customary to revaccinate in one or more occasions. Samples of milk, blood serum and vaginal exudates were collected from 30 cows that had aborted between day 166 and 260 of gestation, all the abortions occurred 22-30 days before sampling; Card, rivanol and radial immunodiffusion tests were performed for Brucellosis diagnosis. For the bacteriological study samples of milk and vaginal swabs were used. The isolated strains were subjected to PCR using specific primers for RB51, S19 and field strains. From the 30 vaginal exudate samples bacteriological analyzed, we isolated smooth B. abortus biotype 1 was isolated from four cows. Thirteen out of the 30 cows vaginal exudates analyzed by PCR revealed the presence of DNA corresponding to RB51 vaccine, the 13 cows that were positive to RB51 through PCR had negative results in both the bacteriological and serological studies.
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