Stag exposure advances the lh surge and behavioral estrus in eld's deer hinds after cidr device synchronization of estrus

Hosack, Dennis; Miller, Karl V.; Ware, Lisa H.; Mashburn, Kendall L.; Morrow, C. J.; Williamson, L. R.; Marchinton, R. Larry; Monfort, Steven L.

doi:10.1016/s0093-691x(99)00077-1

Cited by 16 publications

(3 citation statements)

References 33 publications

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“…Regarding ART, the intravaginal progesterone release device (CIDR ® ) has been used on several deer species from temperate (Morrow et al, 1992(Morrow et al, , 1995Asher et al, 1992Asher et al, , 1993Argo et al, 1994;Hosack et al, 1999) and tropical regions (Zanetti et al, 2010(Zanetti et al, , 2014Zanetti and Duarte, 2012;Cursino et al, 2014;Galindo et al, 2015). Nevertheless, CIDR-based estrous synchronization protocol in deer still requires physical manipulation to insert the device in the animal, which can cause stress in these species (Dobson and Smith, 2000;Morrow et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Low invasive estrous synchronization protocol for wild animals: an example with melengestrol acetate in brown brocket deer (Mazama gouazoubira)

et al. 2020

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Deer are sensitive to stressful stimuli by handling and their reproductive physiology could be altered by these procedures, making it necessary to develop less invasive protocols for ART. Melengestrol acetate (MGA), a synthetic progestin administered orally, appears as an alternative for estrous synchronization protocols (ESP), such as reported in cattle. Firstly, we compared two MGA doses (0.5 and 1.0 mg/day/animal), which would have suppression effect in estrous behavior (EB). Eight females were randomly and equally distributed in Group 1 (G1) and Group 2 (G2), which received 0.5 and 1.0 mg/day/animal respectively for 15 days (D1 to D15). Two cloprostenol (CP) applications were performed on D0 and D11. Estrus detection (ED) was performed every day. All females from G1 displayed estrus during treatment period, whereas all females from G2 displayed estrus after treatment, suggesting a suppressive effect of 1.0 mg in the EB. Once the suppressive MGA dose (1.0 mg) was defined, we used this dose for assessing ESP. The same eight females received 1.0 mg/animal for eight days (D-8 to D-1), followed by 0.25 mg of estradiol benzoate on D-8 and 265 μg of CP on D0. Feces for fecal progesterone metabolites (FPM) measurement were collected from D0 until seven days after the last day of estrus. Seven females displayed estrus between 12 and 72 h after CP application, which was followed by a significant increase in FPM levels (except female MG6), suggesting the formation of corpus luteum. After ED, females were placed with a fertile male to assess the fertility of the protocol. Pregnancy was confirmed by ultrasound 30 days after mating in 3/6 individuals. Although the low effectiveness of MGA protocol, it should be considered as a promising alternative in deer ESP since this protocol has less stressful effect on the animal during reproductive management when compared to other ESP.

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Section: Introductionmentioning

confidence: 99%

Low invasive estrous synchronization protocol for wild animals: an example with melengestrol acetate in brown brocket deer (Mazama gouazoubira)

et al. 2020

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“…Females exposed to rutting calls initiated cycles at over three times the rate of Control individuals and were consequently significantly more synchronous in their expected time to mating. While male presence 21 , 33 – 39 and/or olfactory cues 39 – 42 have been demonstrated to be an important modulator of female reproductive function in many mammal species, our results suggest that male vocalizations alone could be sufficient to account for the empirically observed reproductive synchrony in vast wildebeest herds.…”

Section: Discussionmentioning

confidence: 62%

Male rutting calls synchronize reproduction in Serengeti wildebeest

Calabrese

Clay

Estes

et al. 2018

Sci Rep

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Tightly synchronized reproduction in vast wildebeest herds underpins the keystone role this iconic species plays in the Serengeti. However, despite decades of study, the proximate synchronizing mechanism remains unknown. Combining a season-long field experiment with simple stochastic process models, we show that females exposed to playback of male rutting vocalizations are over three times more synchronous in their expected time to mating than a control group isolated from all male stimuli. Additionally, predictions of both mating and calving synchrony based on the playback group were highly consistent with independent data on wildebeest mating and calving synchrony, while control-based predictions were inconsistent with the data. Taken together, our results provide the first experimental evidence that male rutting vocalizations alone could account for the highly synchronized reproduction observed in Serengeti wildebeest. Given anthropogenically driven losses in many areas, a mechanistic understanding of synchrony can highlight additional risks declining wildebeest populations may face.

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“…Marais and Skinner (1993) found that female blesbok held in the presence of a male were polyestrous, whereas those in isolation remained anestrus until the introduction of a male. Although male presence has been shown in a number of ungulates (Brooks and Cole, 1970;Knight and Lynch, 1980;lason and Guinness, 1985;Verme et al, 1987;Signoret, 1990;Sempere et al, 1996;Hosack et al, 1999) to have an effect on female reproductive function-ranging from advancement of the date of first estrus to ovulation-inducement-the difference between wildebeest and blesbok is surprising, given that the species have similar social systems. Like the Serengeti-Mara wildebeest population, blesbok were formerly migratory, forming mobile aggregations with territorial males who courted females as they crossed their territories (Estes, 1991).…”

Section: Discussionmentioning

confidence: 99%

Endocrine patterns of the estrous cycle and pregnancy of wildebeest in the Serengeti ecosystem

Clay

Estes

Thompson

et al. 2010

General and Comparative Endocrinology

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Stag exposure advances the lh surge and behavioral estrus in eld's deer hinds after cidr device synchronization of estrus

Cited by 16 publications

References 33 publications

Low invasive estrous synchronization protocol for wild animals: an example with melengestrol acetate in brown brocket deer (Mazama gouazoubira)

Low invasive estrous synchronization protocol for wild animals: an example with melengestrol acetate in brown brocket deer (Mazama gouazoubira)

Male rutting calls synchronize reproduction in Serengeti wildebeest

Endocrine patterns of the estrous cycle and pregnancy of wildebeest in the Serengeti ecosystem

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