TRANSMISSION OF SOME SPECIES OF INTERNAL PARASITES IN HORSES BORN IN 1993, 1994, AND 1995 ON THE SAME PASTURE ON A FARM IN CENTRAL KENTUCKY

Data are presented on the last 3 years of a 7-year study (1989-1995) o n transmission of natural infections of internal parasites in horse fo als (n = 27) born in 1993, 1994, and 1995 on the same pasture on a far m in central Kentucky. The foals were in a closed breeding herd of hor ses. Research on the first 4 years (1989-1992) of the study was publis hed earlier (Lyons et al., 1991, 1994). Thirty-five species of endopar asites were identified, including 24 species of small strongyles. Mont hly, seasonal, and host-age transmission patterns were elucidated for the parasites. Comparison of data between the first 4 years and last 3 years of the study indicates similarities, but also differences, incl uding an increase in prevalence and numbers of Thelazia lacrymalis and Anoplocephala perfoliata. (C) 1997 Elsevier Science B.V.