Summary. Reproductive cycles were studied in a group of tame P\l=e`\reDavid's deer hinds. The non-pregnant hind is seasonally polyoestrous and, in animals studied over 2 years, the breeding season began in early August (2 August \ m=+-\ 3\m=.\3days; s.e.m., N = 9) and ended in mid-December (18 December \m=+-\5\m=.\7 days; N = 8) and early January (6 January \ m=+-\3\m=.\2days; N = 11) in consecutive years. During the anoestrous period, plasma progesterone concentrations were low (0\m=.\2\ m=+-\ 0\m=.\01 ng/ml) or non-detectable. During the breeding season, experiments were conducted to investigate synchronization of oestrus with exogenous progestagens. Oestrus occurred 32\p=n-\90h after progestagen removal. The changes in plasma progesterone concentrations which followed oestrus were similar to those seen after natural oestrus.

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