[Use of prostaglandins in suboestrus cows (author's transl)]

One hundred and fifty lactating, suboestrus cows with palpable corpora lutea from twenty herds were treated by intramuscular injection of prostaglandins. The expected date of oestrus was predicted in 150 suboestrous controls of the same herds on the basis of ovarian findings. The average interval between treatment and insemination was 8.8 days in the prostaglandin-treated and 17.6 days in the control group. The interval between treatment and insemination was shorter than eight days in 74 per cent of the prostaglandin-treated cows. Pregnancy rates in the treatment and control groups were 56 per cent and 58 per cent respectively.