In eight trials, 197 heifers were synchronized with gestagen chlorsuperlutin (CSL). The intravaginal tampons soaked with chlorsuperlutin were introduced in the vagina by means of an applier by a vaginal speculum. Silon threads were attached to the tampons, by which they were pulled out after treatment. The mentioned method of application removes the great physical exertion needed for manual application and increases labour productivity in tampon application by about 200%. The hazard of tampon contamination is reduced to the minimum. Of the two tampon types tested (ester and ether type) the ester type was found to be better for not needing sterilization if the disinfectant Aseptin is dropped upon it prior to application. The retention of the tampons was 94.9%. Eighty-four per cent of the retained tampons could be removed by pulling the silon threads. About 40 to 60% of CSL is excreted from the tampons during the treatment. If the initial content of CSL is increased, its excretion is raised as well.

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