Effect of male odour on LH secretion and the induction of ovulation in seasonally anoestrous goats

Claus, R.; Over, R.; Dehnhard, Martin

doi:10.1016/0378-4320(90)90035-e

Cited by 86 publications

(45 citation statements)

References 22 publications

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“…In ewes, the male odor stimulates an increase of the frequency of LH pulses, and induces ovulation in a high proportion of them. However, in other trials a lower proportion of ovulating goats was obtained compared with those teasing with full male contact [13,25]. However, in the dwarf Creole goat from the French West Indies Islands in the Caribbean, peripherally induced anosmia does not prevent the response to the male effect, although the proportion of females showing estrus or ovulation decreases (50% in anosmic females vs. 89% control females) [7].…”

Section: Sensory Cues From the Male Involved In The Male Effectmentioning

confidence: 92%

Importance of the signals provided by the buck for the success of the male effect in goats

et al. 2006

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-Under temperate and subtropical latitudes, ewes and goats display a reproductive seasonal pattern and their sexual activity during the anestrous period can be stimulated and synchronized by the introduction of males in the group, which is called the "male effect". The response of females to the male effect in the middle of the anestrous season is weak or absent. This failure may be due to the inability of the female to respond to males, as a result of a refractoriness of the female to the male stimulus. But, it may also be due to a low quality stimulus provided by the male which is, as the females, in seasonal rest. We tested this latter hypothesis in seasonally inactive goats kept under subtropical conditions by comparing the use of males with their sexual behavior stimulated or not by photoperiodic treatments. Treated males were able to induce estrous activity of females during the whole anestrus season. We have also determined that previous separation of the males and continuous contact during teasing are not absolute requisites when active bucks are used. While odor from the male and its sexual behavior play a primary role in inducing ovulation, vocalizations appear to facilitate the display of the does' estrous. It remains to be determined to which extent these conclusions apply under temperate latitudes and with more seasonal breeds.goat / male effect / buck vocalizations / male odor / sexual behavior / photoperiodic treatment

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Section: Sensory Cues From the Male Involved In The Male Effectmentioning

confidence: 92%

Importance of the signals provided by the buck for the success of the male effect in goats

et al. 2006

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“…During the continuous exposure to the male pheromone, the interval between MUA volleys decreased significantly, indicating the pheromoneinduced acceleration of the hypothalamic GnRH pulse generator activity. Phenomena that the male pheromone stimulates pulsatile LH secretion were reported in previous studies [3,4]. However, it had not been clarified in those reports whether the persistent pheromonal stimulation was necessary to maintain the high frequency of LH pulses.…”

Section: Discussionmentioning

confidence: 83%

“…indirectly stimulates the gonadotropin secretion from the pituitary gland [3,4]. During the continuous exposure to the male pheromone, the interval between MUA volleys decreased significantly, indicating the pheromoneinduced acceleration of the hypothalamic GnRH pulse generator activity.…”

Section: Discussionmentioning

confidence: 99%

“…The procedure for continuous application was based on the method adopted in previous studies [3,[12][13][14], namely the goat was fitted with a nosemask which was equipped with a chamber to set test substances. For habituation the females were put on empty masks for 4-8 h for several successive days before they were subjected to the pheromone application.…”

Section: Preparation Of the Pheromonal Substancementioning

confidence: 99%

“…Primer pheromones are designated to influence recipients' neuroendocrine system, and they subsequently modify various aspects of reproductive function as well as of behavior. One well-known expample of such pheromone-induced gonadal stimulations is the "male effect" [1][2][3] in which seasonally anovulatory female sheep and goats resume their ovarian cyclicity after being exposed to the male or pheromones that are produced androgen dependently in sexually active males [4,5].…”

mentioning

confidence: 99%

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Stimulation of the GnRH Pulse Generator Activity by Continuous Exposure to the Male Pheromones in the Female Goat.

Ichimaru

Takeuchi

Mori

1999

Journal of Reproduction and Development

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Abstract. Male pheromones in ruminant species such as sheep and goats are known to reactivate quiescent ovarian function in seasonally anestrous females. We have previously shown that only a few minutes exposure to the male pheromone can accelerate the GnRH pulse generator activity immediately in the female goat. In this study the effect of 4 h continuous exposure to the male pheromone on the GnRH pulse generator activity was examined by recording the specific multiple unit acitivity (MUA) from the medial basal hypothalamus. Pooled buck hair was used as the source of male pheromone. Six ovariectomized estradiol-primed does were fitted with a nose-mask for 8 h, and during the latter 4 h period 2.0 g of pooled male hair was set in the chamber at the rostral end of the mask. As compared with the period when only an empty mask was put on, the exposure to the male hair resulted in a shortening (p<0.05) of the interval between the MUA volleys, namely the electrophysiological manifestation of the pulsatile GnRH neurosecretion. This stimulatory effect was observed throughout the time when animals were exposed to the male pheromone. This result demonstrates that the hypothalamic GnRH pulse generator of the recipient female is accelerated as long as the exposure to the male pheromone continues.

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The Buck Effect

Islam,

Parmar

2024

Elements of Reproduction and Reproductive Diseases of Goats

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Effect of male odour on LH secretion and the induction of ovulation in seasonally anoestrous goats

Cited by 86 publications

References 22 publications

Importance of the signals provided by the buck for the success of the male effect in goats

Importance of the signals provided by the buck for the success of the male effect in goats

Stimulation of the GnRH Pulse Generator Activity by Continuous Exposure to the Male Pheromones in the Female Goat.

The Buck Effect

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