| Abstract [eng] |
The aim of the study was to investigate the influence of sex ratio on the reproductive system of the budgerigars. The main reproductive system in all the groups was monogamy, i.e. in the group of birds with the equal sex ratio, in the group with female-biased sex ratio and in the group with male-biased sex ratio. The polygynous males fed their primary females more often in comparison with secondary females. Extra-pair copulations were rare. The females copulated with those males which fed them the best in the group of polygamous birds. The reproductive success of primary females was higher in comparison to secondary females. The agonistic behaviour was not an immediate factor of the main reproductive system in budgerigars. Monogamy seems to be the optimum mating situation for female of this species, because the paternal investment of the male turns out to be very important to female’s breeding success. |
