we conclude that 1 ) prolactin and cortisol were secreted rapidly in response to ss and sse , 2 ) the rise in cortisol concentrations likely suppressed testosterone secretion within the next hour , and 3 ) stallions appeared to associate the distant sounds of other stallions with their own previous exposure to ss and sse , resulting in a cortisol response ( and perhaps a prolactin response ) even in the absence of direct stimulation .
C1327616
secreted
C0033371
prolactin