RESUMEN La Campilobacteriosis Genital Bovina (CGB) es una enfermedad infecto contagiosa que afecta al ganado bovino. La enfermedad es considerada de reporte obligatorio y está incluida en la lista B de enfermedades de los animales terrestres según la Organización Mundial de Salud Animal (OMSA). En rumiantes Campylobacter fetus subsp. fetus se ha demostrado que afecta el sistema entérico, especialmente el intestino y es una de las principales causas de infertilidad y aborto en bovinos, ovinos y caprinos. Se ha reportado en varios países del mundo. En México poco se ha estudiado la presencia de este patógeno; en este estudio se comprobó la existencia de Campylobacter fetus subsp. veneralis en toros de la zona centro de Tamaulipas México por la técnica de PCR y secuenciación del producto amplificado, por lo que representa el primer reporte de este patógeno por métodos moleculares en este país.

ABSTRACT Bovine Genital Campylobacteriosis (BGC) is a contagious infectious disease that affects cattle. The disease is considered obligatory reporting and it is included in list B of terrestrial animal diseases according to the World Organization for Animal Health (WOAH). In ruminants, Campylobacter fetus subsp. fetus (Cff) has been shown to affect the enteric system, especially the intestine, and it is one of the main causes of infertility and abortion in cattle, sheep and goats. It has been reported in several countries around the world. In Mexico, the presence of this pathogen has not been studied, so the objective of this research was to detect Campylobacter fetus subsp. veneralis (CFv) by the PCR technique, and to perform its genetic characterization in bulls from the central area of Tamaulipas, Mexico. This is the first report of this pathogen by molecular methods in this country.

Semimytilus algosus (Gould) 1850, constitutes a potencial resource for cultivation in Chile. The geographic distribution extenas from Manta, Ecuador to the Gulf of Arauco in Chile (Osario & Bahamonde, 1968). Juveniles with a 7 mm mode were collected from the mouth of the Bio-Bio River (36º 48'S, 73º10'W), and were encorded using the Spanish and French systems. These cords, 3 m long, were suspended from an experimental raft (4x4 m) in the western part of Concepción Bay (36º 42'S, 72º 02'W). After 11 months of suspension the mussels had attained a modal lenght of 52 mm, and absolute increase of 45 mm. The maximun length measured was 67 mm. A parallel study of the natural population revealed a slow growth rate, with much smaller maxima than those obtained with the raft. The experimental population seemed to exhibit a short life cycle, as demostrated in part by the rapid growth rate and a high natural death rate before completing a year of suspension. A histological analysis showed S.algosus to be hermafroditic, with mature gametes during the entire year. The gametes varied only slightly in shape and size from the gametes described for other mussel species. Canning tests were made in the local industries. Individuals with a modal length of 36-38 mm yielded 30%, while those of 30 mm individuais used in this experiment, S. algosus demonstrated a yield that compared favorably with that of other comercially important mussels, and would seem to present a great potential for a future induslrial resource.