[Use of chlormadinone acetate (CAP) in bovine reproduction (author's transl)]

The results obtained with chlormadinone acetate (CAP) in the treatment of dairy cattle with inactive ovaries (anoestrus) and during the puerperium are reported. CAP was administered to eighteen animals with inactive ovaries for fourteen days. Oestrus occurred in fourteen animals within from one to four days after treatment had been completed. Insemination during this oestrus resulted in pregnancy in five animals. CAP was also administered to sixty animals on three farms for fourteen days during the puerperium, treatment starting on the twelfth day post partum. This was done for the purpose of improving subsequent fertility. However, as regards the interval between parturition and first insemination, the conception rate following the first insemination and the interval between parturition and conception, there were no detectable differences between the treated groups and the controls in the same herds (Table 1).