Detection of fluid within the ventral recess of the vesicogenital pouch of the mare using ultrasound

Abstract

29 per cent) classified as class A had seroprevalence rates of 54 per cent with a predominance of serovar hardjo, followed by bratislava. Serovar pomona was least important on these farms. Eleven farms were classified as class B, with 73 per cent of reactive cows, and four properties were considered as class C, and presented higher levels of reactivity (80 per cent).The relatively great importance of serovar hardjo on farms classified as class A is probably due to the role of cattle as host of this strain, that is, the more intensive the stocking rate, the easier transmission occurs (Ellis and others 1981).The rates observed in this study are very similar to those found in other studies carried out on clinically suspect animals (Carter and others 1982 [73 per cent], Ellis and others 1982 [63 per cent], Salas 1986 [76 per cent]). The most frequent serovar was hardjo, which agrees with the majority of the authors.Acknowledgements. -The authors would like to thank CNPq, Brazil and its research committee for support.