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Copyright of Revista Médica Clínica Las Condes is the property of Editorial Sanchez y Barcelo and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of MediSur is the property of Centro Provincial de Informacion de Ciencias Medicas de Cinfuegos and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Although the tuberculin test is the official diagnosis of bovine tuberculosis, the existence of false positives and false negatives is recognized; then, the interest in environmental mycobacteria as responsible for interspecific reactions is established. The objective of this study was to evaluate the association between the intradermal reaction used in the diagnosis of bovine tuberculosis employing bovine and avian PPD with pathological and bacteriological findings and, on the other hand, assess the possible cross-reaction with environmental mycobacteria using PPD prepared with Mycobacterium fortuitum and M. phlei (PPDs) isolated from soils from La Pampa (Argentina). Fifty (50) bovines were inoculated in the neck with bovine and avian tuberculin and two sensitines made with two strains of environmental mycobacteria (M. fortuitum and M. phlei); 72 hs later the reading and the subsequent necropsy of positive reacting and two non- reacting animals for each positive bovine to any of the PPD were made. 6% of the animals reacted positively to bovine PPD, 2% reacted to the avian PPD and 16% did suspiciously to environmental mycobacteria. Of the 3 animals which reacted positively to bovine PPD, in two of them M. bovis was isolated and histopathological correlation was observed. No association in the diagnosis of intradermal reaction and in the parameters established by applying avian PPD was found. Although some animals displayed a mild suspicious reaction to environmental PPDs, both necropsy and histopathological and bacteriological studies showed no association with tuberculosis or mycobacteriosis. [ABSTRACT FROM AUTHOR]

Alternative method of breeding in the Caldenal area The beef cattle production system in the east area of Caldenal tends to concentrate the parturition in a short period of time, adjusting the availability of forage production with the maximum nutrient herd demand. Nevertheless the current system has the main disadvantage to offer weaning calf in a tiny period of time affecting negatively both the sale price and the provision of animal to feed lot that demand animal year round. The objective of the project was to develop a new methodology to distribute the calving around the year in order to increase the economic and reproductive efficiencies. It was chosen six beef herd on native pasture in the Caldenal area with strategic energy supplementation. The breeding season was planned to be of 90 days of duration, where the last 30 days of breeding of the initial herd mach with the first 30 days of the following. The percentage of calving detected by the alternative method were the same or higher to those observed by the traditional system. [ABSTRACT FROM AUTHOR]