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. Author manuscript; available in PMC: 2011 Jul 1.
Published in final edited form as: Horm Behav. 2010 Mar 16;58(2):306–316. doi: 10.1016/j.yhbeh.2010.03.001

Figure 1.

Figure 1

An experimental flowchart is shown. Young and middle-aged rats were given two pretests 2 days apart. One day later, they were anesthetized, and a blood sample was drawn to enable measurement of intact serum hormone levels. Then, rats were bilaterally castrated, and implanted with a Silastic capsule containing either testosterone or vehicle. Two weeks later, the post-tests were performed two days apart. One day after testing, rats were euthanized by perfusion; a blood sample collected at that time was used for measuring hormone levels following the castration and hormone treatment.