It is clearly not ideal to aquire a young bull (age class under 15) for breeding when there are older females in the herd. It`s better only to use bulls who are fully mature and dominant, 20+ years old.
Without wishing to divert from the Elephant topic, and despite major differences in social organisation, there are some parallels with Gorillas
With elephants teenage bulls too pester the females, with mounting attempts and trying to dominate them so it isn't surprising if in captivity females which can't escape their attentions (in the wild they would be driven away) become hostile toward them. A mature bull is more 'stately' and surer of his position and the cows will respect him for that.
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