Male effect in seasonally anovulatory lactating goats depends on the presence of sexually active bucks, but not estrous females

Véliz, Francisco Gerardo; Moreno, Susana Elisa; Duarte, Gerardo; Vielma, Jesús; Chemineau, Philippe; Poindron, Pascal; Malpaux, Benoît; Delgadillo, J.A.

doi:10.1016/s0378-4320(02)00093-3

Cited by 36 publications

(33 citation statements)

References 24 publications

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“…In treated males, testosterone secretion is higher than in controls from February to April (non-breeding season). Sexual behavior, assessed by anogenital sniffing, nudging and mounts, is also higher in light treated males exposed to anestrous female goats than in controls [8,41]. Similar results are obtained in males raised in open pens and subjected to 2.5 months of long days using a combination of natural and artificial illumination, followed by melatonin implants.…”

Section: Stimulation Of the Sexual Activity Of Male Goats During The supporting

confidence: 74%

“…Similar results are obtained in males raised in open pens and subjected to 2.5 months of long days using a combination of natural and artificial illumination, followed by melatonin implants. In this case, artificial light is given from 0600 to 0900 and from 1800 to 2200 h to obtain 16 h of light/day [41,42]. Interestingly, in males raised in open pens and treated with 2.5 months of artificially long days only and no melatonin implants, testosterone secretion and sexual behavior are stimulated during the non-breeding season and do not differ from those of males receiving melatonin implants [42].…”

Section: Stimulation Of the Sexual Activity Of Male Goats During The mentioning

confidence: 99%

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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: Stimulation Of the Sexual Activity Of Male Goats During The supporting

confidence: 74%

Section: Stimulation Of the Sexual Activity Of Male Goats During The mentioning

confidence: 99%

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

et al. 2006

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“…The sexual behavior of the males was assessed by flehmen, ano-genital sniffing, nudging, mounting attempts and mounts. The sexual activity of the treated bucks used in the present study was significantly higher than that of control males and has been reported elsewhere [8,9]. All females were maintained under extensive management conditions prior to the study.…”

Section: Animalssupporting

confidence: 55%

“…Therefore, it is possible that the low response to the male effect of female goats in poor body condition reported by Mellado et al [6] would not be observed if sexually active bucks are used for teasing. Indeed, using active bucks allowed to obtain a very good response to the male effect independently of environmental factors such as month of seasonal anestrous at which teasing is performed [8,9] or management systems (intensive or extensive) [7]. Therefore we hypothesized that using active bucks would also eliminate the difference of response to teasing between females in good and poor body weight.…”

Section: Introductionmentioning

confidence: 99%

Positive correlation between the body weight of anestrous goats and their response to the male effect with sexually active bucks

et al. 2006

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-In the present study, we analyzed the results of two years of response to the male effect in seasonally anestrous goats to investigate whether the activation of female reproductive activity by the male effect is related to the body weight of the females. Seventy-nine adult female Mexican mixed breed goats were used. The anestrous females were exposed during 15 days to sexually active males, and were classified into three categories according to their mean body weight ±SD (42 ± 9 kg) (Light: ≤ 33 kg, n = 19; Medium: 34-50 kg, n = 46; Heavy: ≥ 51 kg, n = 14). More than 98% of the goats from the Medium and Heavy groups showed at least one estrus behavior within the first 15 days following the introduction of the bucks, versus only 63% of the females from the Light group (P < 0.01). The interval between the introduction of the males and the onset of estrus behavior was longer in the females of the Light and Medium groups (4.2 ± 0.8 and 3.3 ± 0.3 days) than in the females of the Heavy group (2.0 ± 0.2 days; P < 0.03). Also, body weight was negatively correlated with latency to first estrus (Spearman r = −0.57; P < 0.001). These results are in agreement with the hypothesis that the ability of anestrous goats to respond to the male effect is positively influenced by their body weight. seasonality / live weight / estrus induction / teasing / body condition / biostimulation / subtropics

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“…A combination of photoperiod and male effect has been proposed to regulate goat reproductive seasonality (Delgadillo et al 2003(Delgadillo et al , 2004(Delgadillo et al , 2006. In fact, sexually active males exposed to prepuberal (Amoah and Bryant 1984;Mellado et al 2000) and adult females goats synchronised reproductive activity under either lactational or seasonal anestrous (Ve´liz et al 2002(Ve´liz et al , 2006a(Ve´liz et al , 2006bPellicer-Rubio et al 2007). A high proportion of goats exposed to a sexually active male showed estrus behaviour 2 or 3 days after joining with the buck (Chemineau 1983(Chemineau , 1987 and ovulated in response to a male by increases in both GnRH and LH secretion (Chemineau et al 1986a(Chemineau et al , 1986b(Chemineau et al , 2006.…”

Section: Introductionmentioning

confidence: 99%

The male effect stimulus positively increased the ovarian and reproductive seasonality in Criollo goats irrespective of a controlled photoperiodic regime

Rincón

Aréchiga

Escobar

et al. 2011

Journal of Applied Animal Research

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Present study evaluated the presence of a sexually active male buck upon the onset of reproductive activity and estrous cycle progression in Criollo goats exposed to a 6-month long controlled photoperiod in a range of 13.4Á 10.6 light-hours per day. Mexican-native (Criollo) goats (n 010) were randomly assigned into 2 groups: (1) goats exposed to a male buck (n 05); (2) goats not exposed to a male buck (n 05). Blood samples were taken weekly to quantify serum-progesterone levels through radioimmunoanalysis. Male exposure increased luteal activity and estrous cycle progression reflected as a higher number of days in luteal activity (4499.05 vs. 32.3920.6); a reduced number of days in anestrous (4.094.8 vs. 51.9928) and a greater number of luteal phases (15.794.4 vs. 11.398.7) without compromising serum progesterone levels (6.890.8 vs. 7.390.5). In conclusion, presence of a sexually active male induced a greater ovarian activity in Criollo goats, shortening seasonal anestrous irrespective of the controlled photoperiodic regime.

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Male effect in seasonally anovulatory lactating goats depends on the presence of sexually active bucks, but not estrous females

Cited by 36 publications

References 24 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

Positive correlation between the body weight of anestrous goats and their response to the male effect with sexually active bucks

The male effect stimulus positively increased the ovarian and reproductive seasonality in Criollo goats irrespective of a controlled photoperiodic regime

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