Abstract
SUMMARY: The release in vitro of β-glucuronidase from rat testicular homogenates under the influence of ovine and bovine prolactin has been investigated further. A micro modification of the original assay method has been developed, with improved specificity, sensitivity and precision. Assay results were reproducible over 2½ yr. and were in good agreement with bioassays for prolactin and luteotrophic activity.