Department of Zoology, University College of North Wales, Bangor, Gwynedd, LL57 2UW
(Received 5 April 1976)
In both the quail (Nicholls, Scanes & Follett, 1973) and chicken (Sharp, 1975), the plasma luteinizing hormone (LH) concentration is higher in the male than in the female, perhaps reflecting differences between the sexes in the level and intensity of sex steroid feedback. To explore this possibility the relative abilities of male and female quail to release LH were compared. Birds were either injected i.v. with synthetic luteinizing hormone releasing hormone (LH-RH) (0·5 μg/100g body wt, Davies & Bicknell, 1976) or stimulated electrically via an electrode placed in the posterodorsal part of the basal hypothalamus (PD-INC) (Davies & Follett, 1975). Blood samples were collected before and 2 min after injection or stimulation, and assayed for their LH content. The incremental change in LH is defined as the difference between these concentrations.
A similar increment
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