Hormonal control of cyclic estrus in the female hamster

Ciaccio, LA; Rd, Lisk

doi:10.1152/ajplegacy.1971.221.3.936

Cited by 52 publications

(13 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It consists of elevation of the pelvis, elongation of the body, straightening of the back, elevation of the tail, and extension of all four legs. During mating the female remains in this position, which can continue for more than an hour, during which the male mates continuously (Reed and Reed, 1946;Ciaccio and Lisk, 1971).…”

mentioning

confidence: 99%

Ultrastructural evidence for a direct excitatory pathway from the nucleus retroambiguus to lateral longissimus and quadratus lumborum motoneurons in the female golden hamster

Gerrits

Mouton

Weerd

et al. 2004

J of Comparative Neurology

View full text Add to dashboard Cite

During mating, the female golden hamster displays a stereotyped specific receptive posture, characterized by lordosis of the back, elevation of the tail, and extension of the legs. Muscles involved in this posture are thought to be iliopsoas, cutaneus trunci, lateral longissimus (LL), and quadratus lumborum (QL). Lesion studies in rats suggest that mating behavior is controlled by the mesencephalic periaqueductal gray (PAG). The PAG does not project directly to the motoneurons innervating the muscles involved in mating, but is thought to make use of the nucleus retroambiguus (NRA) as relay. The NRA is located ventrolaterally in the most caudal medulla, and projects directly to iliopsoas and cutaneus trunci motoneuronal cell groups. The question is whether this is also true for LL and QL muscles. Retrograde HRP tracing experiments revealed that LL and QL motoneurons are located medially in the ventral horn of the T12-L6 and T13-L4 segments, respectively. A subsequent ultrastructural study combined wheatgerm agglutinin-conjugated horseradish peroxidase injections in the NRA with cholera-toxin B-subunit injections in LL and QL muscles. The results revealed monosynaptic contacts between anterogradely labeled NRA-fiber terminals with retrogradely labeled dendrites of both LL and QL motoneurons. Almost all these terminals had asymmetrical synapses and contained spherical vesicles, suggesting an excitatory function of this NRA-motoneuronal pathway. These results correspond with the hypothesis that in hamster the PAG-NRA-motoneuronal projection not only involves motoneurons of iliopsoas and cutaneus trunci but also of LL and QL.

show abstract

mentioning

confidence: 99%

Ultrastructural evidence for a direct excitatory pathway from the nucleus retroambiguus to lateral longissimus and quadratus lumborum motoneurons in the female golden hamster

Gerrits

Mouton

Weerd

et al. 2004

J of Comparative Neurology

View full text Add to dashboard Cite

show abstract

“…Behavioural oestrus lasts about 16 or 18 h, starting about 1 h before the beginning of the dark period and ending by noon on the following day (Ciaccio & Lisk, 1969). The evidence available indicates that progesterone is the hormone responsible for initiation of behavioural oestrus.…”

Section: Resultsmentioning

confidence: 99%

The Role of Progesterone in Regulating the Period of Sexual Receptivity in the Female Hamster

Ciaccio¹,

Lisk²

1971

Journal of Endocrinology

View full text Add to dashboard Cite

Spayed female hamsters were given a 150 \ g=m\ gpellet ofoestradiol s.c. (day 0). After s.c. placement of a 200 \g=m\gpellet of progesterone 7 days later, all animals displayed oestrous behaviour. Treatment with 200 \g=m\gprogesterone suspended in propylene glycol or sesame oil, on days 4, 5 or 6 also induced an immediate period of heat but subsequent placement of a 200 \g=m\gpellet of progesterone on day 7 did not always result in oestrous behaviour. The animals did not show the lordosis response after placement of the progesterone pellet on day 7 when 200 \g=m\gprogesterone in sesame oil had been given on either day 5 or 6. In contrast, when propylene glycol was employed as the vehicle, only injection on day 6 blocked oestrous behaviour on day 7.When the same amount of progesterone in propylene glycol was administered on day 5, as injections of 50 \g=m\g each over 12 h or more, progesterone in propylene glycol was more effective in blocking oestrous behaviour on day 7. The injection on day 5 of 100 \ g=m\ gprogesterone in propylene glycol as four injections of 25 \ g=m\ g over 12 h did not block oestrous behaviour on day 7. The injection of 50\g=m\gprogesterone in propylene glycol on four successive nights induced a period of sexual receptivity after each injection. These observations indicate that the duration of the insensitive condition, developing as a result of a period of progesterone-facilitated heat, is a function of the amount of hormone causing the initial receptive period, as well as the duration of progesterone stimulation.

show abstract

“…It has been reported that the females are receptive to mating for approximately 16 h from early evening until mid-afternoon on the following day (Ciaccio and Lisk, 1971). All animals should be caged individually for at least 1 week, allowing males to establish cage dominance and the females to cycle normally.…”

Section: Mating and Reproductionmentioning

confidence: 99%