Maintaining contact with bucks does not induce refractoriness to the male effect in seasonally anestrous female goats

Véliz, Francisco Gerardo; Poindron, Pascal; Malpaux, Benoît; Delgadillo, J.A.

doi:10.1016/j.anireprosci.2005.06.006

Cited by 38 publications

(34 citation statements)

References 15 publications

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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: 65%

“…All males were submitted to a photoperiodic treatment of 2.5 months of long days (16 h of light/8 h of darkness). This treatment has previously been shown to stimulate testosterone secretion and to improve sexual activity of bucks during the non-breeding season [7,9]. The sexual behavior of the males was assessed by flehmen, ano-genital sniffing, nudging, mounting attempts and mounts.…”

Section: Animalsmentioning

confidence: 99%

“…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%

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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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Section: Animalssupporting

confidence: 65%

Section: Animalsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…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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“…Recent reports have demonstrated that even physical isolation is dispensable for male effect in sheep and goats. 4,9 Moreover, most reports have evaluated the effects of the male effect on ovulation, 4 but pregnancy rates have not been described in most reports. Since recent discoveries on male effect have not been transferred to commercial breeding practices in small ruminants, a critical aspect of the procedure was revisited here.…”

Section: Introductionmentioning

confidence: 99%

Duration of the breeding season on the reproductive performance of Anglo-Nubian goats during dry and rainy periods

et al. 2014

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The study was aimed to evaluate the effect of breeding season (BS) duration on goat reproduction during dry (DS) and rainy (RS) periods. Females were kept 300 m apart from bucks for 60 days. Females were randomly distributed among BS groups of 25 (BS25), 35 (BS35), and 45 (BS45) days during DS and RS. All females cycled, except during BS45 in DS (95%). The duration of BS did not affect estrous incidence during DS and RS. The percentage of females with two estrous was similar in RS (BS25: 30%, BS35: 35%, BS45: 35%) and DS (BS25: 25%, BS35: 30%, BS45: 25%). Three estrous were observed in BS35 and BS45 during RS (5%). First estrous (FE) and second estrous (SE) were detected from days in BS25 (FE: 1-21, SE: 7-21), BS35 (FE: 1-23, SE: 6-27), and BS45 (FE:1-23, SE: 9-20) during RS. During DS, estrous were detected within days BS25 (FE: 1-17, SE: 6-23), , and BS45 (FE: 2-21, SE: 6-21). Pregnancy rates were similar in RS (BS25: 90%, BS35: 95%, BS45: 95%) and DS (BS25: 75%, BS35: 80%, BS45: 75%). In conclusion, goat BS can be shorten despite weather without any effect on reproduction.

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Maintaining contact with bucks does not induce refractoriness to the male effect in seasonally anestrous female goats

Cited by 38 publications

References 15 publications

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

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

Duration of the breeding season on the reproductive performance of Anglo-Nubian goats during dry and rainy periods

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