This study is not done on parrots [big surprise, right?] and it does not really address all conditions under which breeding behaviors are messed up [as we often see in captive parrots] but it does conclude that: "By influencing mate availability, adult sex ratio bias can alter social behaviour with divorce, infidelity, and parental antagonism being more common in sex-biased populations." which makes me think that maybe the fact that there is no real mate selection in captive breeding might explain some of the bad behaviors we see in captive breeding.
https://www.sciencedaily.com/releases/2 ... 093750.htm