What to make of this study ? Have they got everything backwards?
http://www.ncbi.nlm.nih.gov/pubmed/16472574
"The circulating plasma progesterone concentrations at 10 and 20 days of gestation significantly increased with no significant effect on the prebreeding estrogen concentrations in the treated animals."
http://www.ncbi.nlm.nih.gov/pubmed/16472574
"The circulating plasma progesterone concentrations at 10 and 20 days of gestation significantly increased with no significant effect on the prebreeding estrogen concentrations in the treated animals."