Effect of artificial long days and/or melatonin treatment on the sexual activity of Mediterranean bucks

Zarazaga, L.A.; Gatica, M.C.; Celi, I.; Guzmán, José Luis; Malpaux, Benoît

doi:10.1016/j.smallrumres.2010.05.008

Cited by 40 publications

(45 citation statements)

References 29 publications

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“…Vé liz et al (2006) suggest that previous isolation of seasonally anovulatory does from bucks to stimulate their reproductive activity by the male effect is unnecessary if sexually active bucks are introduced to them. With regard to the results obtained at Mediterranean latitudes, this assumption might not be applicable, because in our experiment none of the control females showed oestrous activity although the males were sexually active, as they were treated similarly to females (Zarazaga et al, 2010). Another factor that can stimulate the reproductive activity in non-treated females is the presence of females in oestrus.…”

Section: Discussionmentioning

confidence: 74%

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Artificial long days in addition to exogenous melatonin and daily contact with bucks stimulate the ovarian and oestrous activity in Mediterranean goat females

Zarazaga

Gatica

Celi

et al. 2011

Animal

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One experiment was conducted to determine whether the treatment with artificial long days and exogenous melatonin can induce reproductive activity during spring (seasonal anoestrus) in Mediterranean goats that are in daily contact with bucks and whether this treatment causes a variation in the reactivation of the reproductive activity in the normal breeding season. The experiment started on 4 November 2005 and finished on 27 October 2006. Thirty-four adult and barren does were used, distributed into two groups balanced according to their live weight (LW) and body condition score (BCS). Seventeen females were exposed to long days (16 h of light/day) from 14 November 2005 to 20 February 2006. On 20 February, they received one s.c. melatonin implant (LD-M group) and were exposed to natural photoperiodic changes in an open shed. The other females during the experiment were placed in an open shed under natural photoperiod and remained as the control group (C group). The C and LD-M groups were keeping in contact with males during the whole experiment. During the experiment, the LW, BCS and plasma progesterone concentrations were measured weekly, oestrous activity was tested daily using entire aproned bucks, and ovulation rate was evaluated by laparoscopy 7 days after positive identification of the oestrus. A clear treatment–time interaction was observed for plasma progesterone concentrations ( P,0.001), with a period of high progesterone concentrations during the natural seasonal anoestrus in the LD-M group. Although 94.1% of females in the LD-M group presented ovarian activity during this period, no female in group C did. Resumption of ovarian activity in the subsequent natural breeding season was 2 weeks later in the LD-M group in comparison with group C ( P,0.05). We can conclude that in Mediterranean goat breeding systems, when females are in daily contact with bucks, the treatment with 3 months of long days and melatonin implant at the end of the light photoperiodic treatment can induce ovarian and oestrous activity during the seasonal anoestrus. Finally, this treatment causes a short delay in the subsequent reactivation of ovarian activity in the natural breeding season

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Section: Discussionmentioning

confidence: 74%

“…Seven of them were treated similarly to treated females (long days and melatonin) and five were not treated (Zarazaga et al, 2010). The photoperiodic treatment of the males was simultaneous to that of the females.…”

Section: Animals and Managementmentioning

confidence: 99%

Artificial long days in addition to exogenous melatonin and daily contact with bucks stimulate the ovarian and oestrous activity in Mediterranean goat females

Zarazaga

Gatica

Celi

et al. 2011

Animal

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“…The endocrine and reproductive seasonality is mainly controlled by variations of photoperiod: short days stimulate and long days inhibit the sexual activity Delgadillo et al, 1991;Zarazaga et al, 2010). Thus, the manipulation of photoperiod enables to induce the sexual activity of bucks and rams during the natural sexual rest period Leboeuf et al, 2008;Bedos et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the manipulation of photoperiod enables to induce the sexual activity of bucks and rams during the natural sexual rest period Leboeuf et al, 2008;Bedos et al, 2010). Indeed, exposure of bucks or rams to 2 or 3 months of long days, followed by either natural photoperiod, artificial short days or a melatonin treatment -a hormone that mimics permanent night -stimulates their endocrine and sexual activity during the non-breeding season for about 2 months (Pellicer-Rubio et al, 2008;Zarazaga et al, 2010;Delgadillo, 2011). Interestingly, in rams, long days followed by a continuous exposure to light, stimulates testosterone secretion during the non-breeding season (Malpaux and Chesneau, 2006).…”

Section: Introductionmentioning

confidence: 99%

Continuous light after a long-day treatment is equivalent to melatonin implants to stimulate testosterone secretion in Alpine male goats

Delgadillo

Vélez

Flores

2016

animal

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In rams, artificial long days followed by continuous light stimulate testosterone secretion during the non-breeding season. The objective of this study was to determine whether artificial long days followed by continuous light could stimulate testosterone secretion in Alpine bucks as well as in those exposed to long days followed by a melatonin treatment. All bucks were kept in shaded open pens. Control males were exposed to natural photoperiod conditions (n=5). Males of the two experimental groups were exposed to 2.5 months of long days from 1 December (n=5 each). On 16 February, one group of males was exposed to 24 h of light per day until 30 June; the other group was exposed to natural variations of photoperiod and received two s.c. melatonin implants. Testicular weight was determined every 2 weeks, and the plasma testosterone concentrations once a week. In the control and the two photoperiodic-treated groups, a treatment×time interaction was detected for testicular weight and plasma testosterone concentrations (P<0.001). In control bucks, testicular weight increased from January and peaked in June, whereas in both photoperiodic-treated groups, this variable increased from January, but peaked in April, when the values were higher than in controls (P<0.05). In the control group, plasma testosterone concentrations remained low from January to June, whereas in both photoperiodic-treated groups, this variable remained low from January to March; thereafter, these levels increased in both photoperiodic-treated groups, and were higher than controls in April and May (P<0.05). We conclude that continuous light after a long-day treatment stimulate testosterone secretion in Alpine male goats during the non-breeding season as well as the long days followed by a melatonin treatment. Therefore, continuous light could replace the implants of melatonin.

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“…To stimulate their sexual activity during seasonal anoestrous, they received three subcutaneous MEL implants 45 days before the females were expected to give birth. Each implant containing 18 mg of the hormone Melovine ® and was inserted at the base of the left ear (Zarazaga et al, 2010). The control of oestrous started on the day of birth (D0) in the groups NBE and from the introduction of males (day 55 th after birth) in the BE groups.…”

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confidence: 99%

Short communication. Melatonin improves the reproductive performance of seasonal anoestrus goats exposed to buck effect during early post-partum

Zarazaga

Gatica

Gallego-Calvo

et al. 2013

Span. j. agric. res.

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The aim of the present study was to determine whether any combination of buck effect and melatonin treatment could improve reproductive performance in Payoya female goats during early postpartum. Forty-four pregnant female goats were used. After birth in spring, they were distributed into two major groups: females submitted to the buck effect (BE, N=22) or not such effect (NBE, N=22). In turn, the BE animals were subdivided into: 1) no further treatment (CBE, N=11) and 2) implanted with melatonin (MELBE, N=11). And the NBE animals were subdivided into: 3) no further treatment (CNBE, N=12) and 4) implanted with melatonin (MELNBE, N=10). Melatonin was implanted 10 days after birth. Oestrus activity was tested daily using entire males from day of birth (D0) in the groups NBE and from D55 after birth in the BE groups. Transrectal ultrasonography was performed 10 days after the detection of oestrus and 45 days after mounting to determine pregnancy. Fecundity, fertility and productivity were higher in MELBE animals compared to CNBE animals (fecundity and fertility: 66.7% vs. 0.0%, and productivity: 0.73 vs. 0.00 kids/female for MELBE and CNBE respectively, p<0.05), and CBE animals (fecundity and fertility: 66.7% vs. 14.3%, and productivity: 0.73 vs. 0.09 kids/female for MELBE and CBE respectively; p<0.05). No significant differences were recorded between the subgroups of the NBE animals. The present results show that exogenous melatonin improves the reproductive performances of early post-partum Payoya does exposed to male effect during the seasonal anoestrus.

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Effect of artificial long days and/or melatonin treatment on the sexual activity of Mediterranean bucks

Cited by 40 publications

References 29 publications

Artificial long days in addition to exogenous melatonin and daily contact with bucks stimulate the ovarian and oestrous activity in Mediterranean goat females

Artificial long days in addition to exogenous melatonin and daily contact with bucks stimulate the ovarian and oestrous activity in Mediterranean goat females

Continuous light after a long-day treatment is equivalent to melatonin implants to stimulate testosterone secretion in Alpine male goats

Short communication. Melatonin improves the reproductive performance of seasonal anoestrus goats exposed to buck effect during early post-partum

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