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Abstract
The plasma concentrations of progesterone and oestradiol-17β were measured in 14 cows after intrauterine treatment with prostaglandin F2α or benzyl alcohol. There was a rapid decline in progesterone levels and an associated rise in oestrogen levels after treatment with prostaglandin. Four cows treated early in the cycle showed atypical hormone patterns but displayed normal oestrous behaviour. The decline in progesterone levels and the associated rise in oestrogen Ievc,ls occurred about 10 days after treatment with benzyl alcohol between days 4 and 20 of the cycle. Thus benzyl alcohol can induce both a luteolytic reaction when given on days 4–7 and a luteotrophic reaction when given on days 14–20.