The changes in total unconjugated oestrogen and progesterone concentrations in the peripheral blood of one bitch throughout a false pregnancy were measured. The levels of these hormones detected in 11 bitches when examined during a false pregnancy, and in 13 other bitches with pyometa are also reported. Oestrogen and progesterone concentrations were within normal limits in both of these conditions where single samples were obtained, but the bitch with false pregnancy studied in detail showed a raised oestrogen level during metoestrus. The significance of these results is discussed in relation to previous studies on the aetiology of false pregnancy and pyometra.
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