Female lemurs receiving hormonal contraception differed from naturally cycling animals in their gland microbes and scent chemistry. A single peer-reviewed study followed 21 females from two species in a captive population. Hormonal patterns and chemical signals were linked, while associations between microbes and scent were modest. The results leave several possible routes connecting reproductive state with chemical communication.
Hormonal contraception muted reproductive-hormone cycling in female lemurs, alongside differences in gland bacteria and scent compounds. The single peer-reviewed animal study followed 21 females at a captive primate research facility. Eleven were ring-tailed lemurs and ten were Coquerel’s sifakas. Seven animals cycled naturally as controls, while fourteen received hormonal treatment; sampling covered four points across a reproductive cycle.[1]
Researchers compared reproductive hormones, the bacterial communities of scent glands and volatile chemicals released in secretions. The makeup of those communities differed between conditions, while overall bacterial diversity did not show the same pattern. Ring-tailed lemurs also had much richer detected chemical mixtures than sifakas. Some samples failed quality requirements and were removed, leaving different sample totals for the hormonal, microbial and chemical comparisons.[1]
Associations between microbial makeup and scent chemistry were modest, and several comparisons remained statistically inconclusive. Hormones could influence chemical production directly as well as through microbes, while measurement resolution offers another possible explanation for weak associations. The findings concern these two species in a small captive population. Repeating observations across further cycles and years would help establish how consistently the hormonal, microbial and scent patterns recur.[1]
