Notes on the determination and the occurrence of some reproductive derangements in a group of Friesland cows.

Cyclic activity and palpable features of the bovine genitalia were recorded by means of observation and a prolonged series of follow-up palpations. Various uncommon features concerning follicular development, oestrus performance, ovulation and the corpus luteum are described together with observations on the cystic enlargement of follicles and corpora lutea. Cases are reported of ovarian haemorrhage at oestrus and cystic enlargement of the endometrium.