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Abstract
Sales of intramammary cerates to a group of 142 dairy farms over a period of two years were monitored.
On the assumption that three tubes of cerate are used to treat one case of mastitis, an estimate was made of the prevalence of clinical mastitis in these herds.
The prevalence in seasonal supply herds was 21 cases per 100 cows per year and the prevalence in town supply herds was 66 cases per 100 cows per year.
The usage of dry cow therapy was related to changes in the prevalence of clinical mastitis in these herds.
The use of whole-herd therapy reduced the prevalence of clinical mastitis in herds which had a high prevalence in the first year, but in herds with a low prevalence of clinical mastitis the prevalence increased after the use of dry cow therapy.
