Keywords
Small ruminant lentivirus; Goat; Sheep; Recombination; Phylogenetic analysis
Small ruminant lentivirus (SRLV) infections in Mexico were first diagnosed serologically in goats imported from the USA in 1984 (Adams et al., 1984). Only one Mexican SRLV isolate has been reported to date, but it has not been characterised genetically (Daltabuit et al., 1999). SRLV infection is now widespread in the country among imported goats, producing mainly chronic arthritis (Nazara et al., 1985 and Torres-Acosta et al., 2003), whereas SRLV infection of sheep has not been reported. In recent years, live animals and semen have been imported into Mexico from France and the USA without SRLV testing. The aim of this study was to determine the genetic characteristics of SRLV infections in sheep and goats on a Mexican farm that included imported animals.
The farm, located in Central Mexico, had 90 sheep and 80 goats reared under a semi-intensive system. It was established 25 years previously with imported goats and sheep or their progeny from a farm in Northern Mexico. There was continuous introduction of animals, especially breeding stock, from various sources; imported animals were last introduced to the farm 10 years previously. The herd of goats comprised animals of the Alpine (90%) and Toggenburg (10%) breeds imported from the USA but originally of French origin. The flock of sheep comprised animals of the Columbia breed originally imported from the USA. At the time of study, nearly 10% of goats had arthritis and one sheep (No. 12S) exhibited nervous signs.
KeywordsSmall ruminant lentivirus; Goat; Sheep; Recombination; Phylogenetic analysisSmall ruminant lentivirus (SRLV) infections in Mexico were first diagnosed serologically in goats imported from the USA in 1984 (Adams et al., 1984). Only one Mexican SRLV isolate has been reported to date, but it has not been characterised genetically (Daltabuit et al., 1999). SRLV infection is now widespread in the country among imported goats, producing mainly chronic arthritis (Nazara et al., 1985 and Torres-Acosta et al., 2003), whereas SRLV infection of sheep has not been reported. In recent years, live animals and semen have been imported into Mexico from France and the USA without SRLV testing. The aim of this study was to determine the genetic characteristics of SRLV infections in sheep and goats on a Mexican farm that included imported animals.The farm, located in Central Mexico, had 90 sheep and 80 goats reared under a semi-intensive system. It was established 25 years previously with imported goats and sheep or their progeny from a farm in Northern Mexico. There was continuous introduction of animals, especially breeding stock, from various sources; imported animals were last introduced to the farm 10 years previously. The herd of goats comprised animals of the Alpine (90%) and Toggenburg (10%) breeds imported from the USA but originally of French origin. The flock of sheep comprised animals of the Columbia breed originally imported from the USA. At the time of study, nearly 10% of goats had arthritis and one sheep (No. 12S) exhibited nervous signs.
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