One can take these statistics as a rule:
1) Sexual maturity in females at 4-6 years, males at 7-10 years of age. First reproduction in captivity for females at 4 years and 7 days and males 6 years, 3 months and 24 days.
Source: ISB GOHR - 2019.
2) Females are reproductive starting at 4 years of age, while most males haven’t reproduced untill 7 years of age.
I would say in the case of Dora and Amala, the "issue" is probably more to do with the male being inexperienced and perhaps and yes speculative his early husbandry and upbringing in Japan - with the standards there for rhino facilities at another level space and enrichment-wise (my qualified judgement, mind and no offence intended) -. The calf born on 25/10/2015 has sadly passed away 23/09/2017 from tetanus inflammation and ensuring medical complications. I am not sure however if and when the pair Dora and Amala were reintroduced to one-another since. I would expect an introduction to start at anywhere from 2+ years of the calf's age.
Further, I do think it is somewhat of a "myth" that the more solitary rhino species are more "difficult" to (get) to breed as it is down to understanding their social and behavioural cues and providing adequate facilities first and foremost. In this, keeper experience and general animal husbandry training are key factors in success rate.
On present limited evidence, I cannot help but feel they might be leaving it till late. I would applaud Dubbo - WPZ import another pair at least to increase chances of having successful reproduction. I wonder if and how other Australian zoos could make or be willing to make a contribution here too in the interest of this individual rhino species interests within the country.
1) Sexual maturity in females at 4-6 years, males at 7-10 years of age. First reproduction in captivity for females at 4 years and 7 days and males 6 years, 3 months and 24 days.
Source: ISB GOHR - 2019.
2) Females are reproductive starting at 4 years of age, while most males haven’t reproduced untill 7 years of age.
I would say in the case of Dora and Amala, the "issue" is probably more to do with the male being inexperienced and perhaps and yes speculative his early husbandry and upbringing in Japan - with the standards there for rhino facilities at another level space and enrichment-wise (my qualified judgement, mind and no offence intended) -. The calf born on 25/10/2015 has sadly passed away 23/09/2017 from tetanus inflammation and ensuring medical complications. I am not sure however if and when the pair Dora and Amala were reintroduced to one-another since. I would expect an introduction to start at anywhere from 2+ years of the calf's age.
Further, I do think it is somewhat of a "myth" that the more solitary rhino species are more "difficult" to (get) to breed as it is down to understanding their social and behavioural cues and providing adequate facilities first and foremost. In this, keeper experience and general animal husbandry training are key factors in success rate.
On present limited evidence, I cannot help but feel they might be leaving it till late. I would applaud Dubbo - WPZ import another pair at least to increase chances of having successful reproduction. I wonder if and how other Australian zoos could make or be willing to make a contribution here too in the interest of this individual rhino species interests within the country.