Effects of sexual stimulation on plasma levels of LH and testosterone in rams from high- and low-fertility flocks

Moore, R.; Whyman, D.; Wilson, P. R.

doi:10.1530/jrf.0.0530067

Cited by 15 publications

(3 citation statements)

References 9 publications

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“…Sniffing, nudging, Flehmen, mounting and ejaculation are commonly involved in the male sexual courtship. Some reports have shown that sexual activity or proximity of oestrous females also increased plasma concentrations of LH and testosterone in the mouse (Coquelin & Bronson, 1980), rat (Kamel & Frankel, 1978), hamster (Macrides et al, 1974), rabbit (Agmo, 1976), monkey (Herndon et al, 1981), boar (Liptrap & Raeside, 1978), bull (Katongole et al, 1971) and ram (Sanford et al, 1974a;Moore et al, 1978). IUius et al (1976) reported that mature rams kept for 6 months in close proximity with cycling (oestrus induced) ewes had larger testes, higher testosterone concentrations and greater sexual and aggressive activity compared with those kept isolated from females.…”

Section: Introductionmentioning

confidence: 99%

Temporal variation in LH and testosterone responses of rams after the introduction of oestrous females during the breeding season

González¹,

Poindron²,

Signoret³

1988

Reproduction

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The response of sexually experienced Ile-de-France rams to the presentation of oestrous females in October at sunrise (Subgroup S) or at 11:00 h (Subgroup N) was studied and compared with unstimulated controls (Subgroup C). Animals (12 per group) were bled for 7 h at 20-min intervals, starting 3 h before stimulation by oestrous females (3 per group). Eight rams from Subgroup S showed an increase of LH pulse frequency and only 3 in Subgroup N (P less than 0.03). In Subgroup S the introduction of females led to 2- and 3-fold increases in LH pulse frequency during the stimulation period compared with values in Subgroup C or before the stimulation period (3, 1.6 and 1 peaks/rams/6 h respectively; P less than 0.05). The presence of females also led to an increase in mean testosterone concentrations, and small increases in basal and mean LH values. No differences were found in LH peak amplitudes. In Subgroup N only inconsistent evidence of increases in mean LH and testosterone values was found. No differences between Subgroups S and N in behavioural patterns during stimulation were detected. We conclude that the presence of females affects LH pulse frequency at sunrise but not at noon during the breeding season and this effect is at least partly independent of sexual behaviour. These results suggest a possible circadian variation in CNS sensitivity involving the hypothalamic regulation of LH secretion in response to the presence of oestrous females.

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Section: Introductionmentioning

confidence: 99%

Temporal variation in LH and testosterone responses of rams after the introduction of oestrous females during the breeding season

González¹,

Poindron²,

Signoret³

1988

Reproduction

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“…The influence of sexual stimulation on testosterone and LH plasmatic levels has been determined in different species. The sexual stimulation caused a significantly increased mean plasma LH in bulls (Katongole et al 1971) and in rams (Moore et al 1978) immediately after ejaculation; this LH peak was followed by a peak of the testosterone concentration between 30 and 60 min after the sexual stimulation. However, the plasma concentrations of LH and testosterone did not show consistent changes up to 4 h after sexual stimulation or ejaculation in stallions (Rabb et al 1989).…”

Section: Introductionmentioning

confidence: 88%

“…The sexual stimulation caused a significantly increased mean plasma LH in bulls (Katongole et al. 1971) and in rams (Moore et al. 1978) immediately after ejaculation; this LH peak was followed by a peak of the testosterone concentration between 30 and 60 min after the sexual stimulation.…”

Section: Introductionmentioning

confidence: 95%

Influence of Sexual Stimulation and the Administration of Human Chorionic Gonadotrophin on Plasma Testosterone Levels in Dogs

Santana

Batista

Alamo

et al. 2011

Reprod Domestic Animals

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The influence of sexual stimulation and human chorionic gonadotrophin (hCG) administration on plasma testosterone concentrations was assessed in five male Beagles. Each dog was exposed to three experimental treatments: C treatment (Control, no stimulation), hCG treatment (dogs were SC injected with 1000 IU of hCG) and sexually stimulated (SS) treatment where semen was collected from the males. All dogs were exposed to all treatments, one per week for three consecutive weeks, with a 1 week of rest between treatments. Blood samples were taken with the same time intervals (0, 10, 30, 60 and 120 min) relative to treatments. Plasma testosterone concentrations were determined with a solid-phase I(125) radioimmunoassay. In the control treatment, the testosterone plasma levels did not show significant changes throughout the tested period (mean values ranging between 2.8 and 4.7 ng/ml); the hCG group presented a significant increase (p < 0.05) in plasma testosterone levels 30 min after hCG administration and had the highest value (8.7 ng/ml) at 120 min post-hCG. Finally, the SS group revealed a slight reduction in testosterone concentration immediately after ejaculation, but the values remained nearly unaltered until 120 min after semen collection. When the groups were compared, the hCG group showed higher plasma testosterone values (p < 0.05) than did the C and SS groups, starting at 30 min and continuing until the end of sampling. This study demonstrates that sexual stimulation associated with semen collection does not produce transitory modifications in plasma testosterone concentrations.

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Changes in Serum Levels of LH, FSH, Prolactin, Testosterone, and Cortisol Associated with Season and Mating in Male Pygmy Goats

Howland

Sanford

Palmer

1985

Journal of Andrology

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Four male pygmy goats were used in a study designed to determine the effects of season on serum hormone (luteinizing hormone, follicle stimulating hormone, prolactin, testosterone, and cortisol) levels, testis size and libido, and the effects of mating on serum hormone profiles. Seasonal peaks were observed for prolactin in July, luteinizing hormone and follicle stimulating hormone in September, and testosterone in October. Luteinizing hormone peak frequency was greatest in September and was increased by mating activity in the months immediately preceding the breeding season. Scrotal circumference did not vary with season and libido showed no consistent seasonal pattern. Mating appeared to raise all hormone levels except during the months when these hormones were seasonally elevated. When episodic releases of luteinizing hormone occurred, they were associated with subsequent rises in serum testosterone levels. On some mating days, when episodic releases of luteinizing hormone were absent, changes in testosterone levels were highly correlated with changes in cortisol levels. It was concluded that both season and mating influence reproductive hormone levels in male pygmy goats.

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Effects of sexual stimulation on plasma levels of LH and testosterone in rams from high- and low-fertility flocks

Cited by 15 publications

References 9 publications

Temporal variation in LH and testosterone responses of rams after the introduction of oestrous females during the breeding season

Temporal variation in LH and testosterone responses of rams after the introduction of oestrous females during the breeding season

Influence of Sexual Stimulation and the Administration of Human Chorionic Gonadotrophin on Plasma Testosterone Levels in Dogs

Changes in Serum Levels of LH, FSH, Prolactin, Testosterone, and Cortisol Associated with Season and Mating in Male Pygmy Goats

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