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Familial influences on ovulatory function in common marmosets (Callithrix jacchus)
W Saltzman1, N J Schultz-Darken, D H Abbott
1Wisconsin Regional Primate Research Center, University of Wisconsin, Madison 53715-1299, USA.
American Journal of Primatology
|January 1, 1997
Summary
Social suppression of ovulation affects nearly half of female common marmosets (Callithrix jacchus) in natal families, with familial social dynamics influencing ovarian activity and reproductive outcomes.
Area of Science:
- Primate reproductive endocrinology
- Behavioral ecology
- Social influences on reproduction
Background:
- Social suppression of ovulation is observed in female primates housed with their natal families.
- Previous studies suggest varied ovulatory responses in female common marmosets within family groups.
Purpose of the Study:
- To determine the prevalence of social suppression of ovulation in common marmoset daughters.
- To investigate familial influences on daughters' ovarian activity and endocrine profiles.
- To understand the factors contributing to reproductive failure in these social contexts.
Main Methods:
- Longitudinal monitoring of ovarian activity in 46 common marmoset daughters over 5-12 months.
- Analysis of plasma progesterone concentrations to assess ovulation and luteal phase function.
- Experimental manipulation of family structures (e.g., mother pregnancy status, father replacement).
Main Results:
- 46.3% of daughters in intact natal families ovulated, with first ovulation around 17.2 months, but none conceived.
- Daughters' ovulatory cycles differed significantly from older females, showing longer inter-ovulatory intervals and shorter, less robust luteal phases.
- Ovulation likelihood increased when the mother's pregnancy was prevented or the father was replaced; older sisters completely suppressed ovulation, while female littermates led to more sporadic cycles.
Conclusions:
- Social suppression of ovulation is prevalent but not absolute in common marmoset daughters within natal families.
- Reproductive failure involves more than just ovulation suppression, encompassing luteal phase defects and other factors.
- Family social dynamics, including the presence of specific relatives, significantly modulate daughters' ovulatory likelihood and cycle endocrine profiles.