Plasma concentrations of ovarian hormones during the oestrous cycle of the sheep and cow.

Measurements were made of the plasma concentrations of testosterone, progesterone and oestradiol-17 beta during the oestrous cycle of the ewe, and of the plasma concentrations of testosterone and progesterone during the oestrous cycle of the heifer. The maximum concentration of progesterone in the heifer was nearly twice that in the ewe. The maximum concentration of testosterone was similar in both species and occurred at the onset of luteolysis; in the ewe the peak concentration of 19.

Television slit-lamp biomicroscopy.

The basic requirements for performing television slit-lamp biomicroscopy are outlined, and the methods of demonstrating particular features of ocular anatomy and ocular disease are discussed. The technique has a particular role in teaching in the clinical setting.