Hormonal regulation of agonistic and affiliative behavior in female mongolian gerbils ( Meriones unguiculatus)

• Published in: Hormones and behavior Vol. 43; no. 5; pp. 549 - 553
• Main Authors: Razzoli, Maria, Cushing, Bruce S, Carter, C.Sue, Valsecchi, Paola
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Inc 01-05-2003; Elsevier
• Subjects: Affiliation; Aggression; Agonistic Behavior - physiology; Animals; Behavioral psychophysiology; Biological and medical sciences; Estradiol - physiology; Estrogen; Female; Fundamental and applied biological sciences. Psychology; Gerbillinae - physiology; Gerbillinae - psychology; Hormones and behavior; Matched-Pair Analysis; Mongolian gerbil; Ovariectomy; Oxytocin; Oxytocin - physiology; Progesterone; Progesterone - physiology; Psychology. Psychoanalysis. Psychiatry; Psychology. Psychophysiology; Sexual Behavior, Animal - physiology; Social Behavior; Mongolian gerbil; Oxytocin; Aggression; Estrogen; Female; Progesterone; Affiliation; Meriones unguiculatus; Ovariectomy; Intraspecific relation; Rodentia; Sexual behavior; Breeding behavior; Ovarian hormone; Vertebrata; Mammalia; Social interaction; Animal; Pair formation; Sex steroid hormone; Aggressiveness; Agonistic behavior
• ISSN: 0018-506X; 1095-6867
• DOI: 10.1016/S0018-506X(03)00064-3

Ovarian steroids and oxytocin (OT) have been implicated in the regulation of social behaviors. The purpose of the present study was to examine hormonal substrates of aggression and affiliation in the female Mongolian gerbil (
Meriones unguiculatus), a highly social, monogamous rodent. Sexually naive adult females were paired with sexually experienced males for 48 h and their interactions videotaped. Females were gonadally intact and tested during vaginal estrus (INT) or ovariectomized and observed after the following treatments, administered by means of sc injections: EBEB (7 days of estradiol-benzoate); EBP (2 days of EB followed by progesterone), SALEB (saline, days 1–5 then 2 days of EB), OTEB (OT for days 1–5 then 2 days of EB); OTOIL (OT for days 1–5 then 2 days of OIL); or SALOIL (saline days 1–5 then 2 days of OIL). During the first hour of pairing INT females displayed higher levels of affiliation and lower levels of sniffing and agonistic behavior than SALOIL females. All hormonal treatments reduced agonistic behaviors when compared to SALOIL, although none of the hormonal treatments restored affiliation to INT levels. During the 48-h test overt aggression varied by treatment with INT, EBEB, EBP, and OTEB females displaying lower levels than SALOIL, while all groups displayed similar levels of affiliation. The results indicate that OT and E play a significant role in regulating male-directed aggressive behavior in females and that the presence of ovarian hormones as well as OT can increase affiliation during initial contact. Over a sustained period of cohabitation social cues appear to be more important in regulating affiliation than gonadal hormones.