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Table 3 Characteristics of relaxin secretion in non-pregnant and pregnant cycles of humans and selected non-human primate species.

From: Biology of primate relaxin: A paracrine signal in early pregnancy?

Species Days to peak serum relaxin concentrations (Ovulation = D0) Peak serum relaxin concentrations (ng/ml) Normal term gestation (Days) Reference
Human     
Non-pregnant cycle 10 0.06   [200]
Pregnant cycle 56–77 1.0–3.5 280 [201]
Chimpanzee     
Non-pregnant cycle 8–13 0.15–1.40   [202]
Pregnant cycle 30 2.0 230 [202]
Baboon     
Non-pregnant cycle 12 0.45   [48]
Pregnant cycle 25–35 1.0–1.5 177 [203]
Rhesus macaque     
Non-pregnant cycle 13 0.05   [204]
Pregnant cycle 45–60 1.0–1.5 165 [43]
Cynomolgus macaque     
Non-pregnant cycle 16 0.03   [43]
Pregnant cycle 45–60 1.0–1.5 165 [43]
Common marmoset     
Non-pregnant cycle 10–11 1.0–2.5   [205]
Pregnant cycle 84–98 12.0–16.0 155 [51]