One day of contact with photostimulated bucks is sufficient to induce ovulation in seasonally anestrous goats

Ponce, José Luis; Hernández, H.; Flores, Jerónimo Landeros; Keller, Matthieu; Chemineau, Philippe; Delgadillo, J.A.

doi:10.1016/j.theriogenology.2015.05.019

Cited by 7 publications

(3 citation statements)

References 32 publications

(84 reference statements)

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“…Similar delay was observed in the beginning of breeding season with adult goats when submitted to active male (Bedos et al, 2012(Bedos et al, , 2014. In contrast, other studies from a subtropical latitude with local goats argue that few a days of contact were enough to stimulate estrus behavior in adult goats (Martinez-Alfaro et al, 2014;Ponce et al, 2015). Furthermore in the present study, the percentage of goats (that ranged from 44 to 70%) displaying estrus behavior was lower than in adult goats at the beginning of the breeding season (higher than 90%) (Bedos et al, 2014;Martinez-Alfaro et al, 2014;Ramirez et al, 2017).…”

Section: Discussionsupporting

confidence: 58%

Influence of male on estrus behavior, estradiol and progesterone release and puberty onset on prepubertal Saanen goats

Augusto

Rodrigues

Merighe

et al. 2020

SCA

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The present study investigated the male effect on the estrus behaviors, estradiol and progesterone release in prepubertal Saanen goats. Twenty-nine female Saanen goats at 135 ± 10 days old with body weight of 22.8 ± 3.3 Kg were randomly assigned to three treatments: exposure to sexually active male (male treatment), exposure to androgenized females (androgenized female treatment), and prepubertal goats isolated from active male and androgenized females (control treatment). Sexual behaviors associated with estrus were recorded daily, and blood samples were taken weekly to determine estradiol and progesterone concentrations over 24 weeks. The experimental goats subjected to male or androgenized female had significantly higher frequency of estrus (mount acceptance) (P ? 0,02), progesterone (P ? 0,01), and estradiol (P ? 0,01) release than the control goats. Furthermore, goats exposed to a male showed estrus behavior two weeks earlier and maintained this estrus behavior for three weeks more than goats of both female and control treatments. Estrus was observed in 70 % of goats in male and female treatments during the breeding season versus 44 % of the control goats. Finally, significantly more goats subjected to male treatment (60 % of goats) showed progesterone concentrations higher than 1 ng mL-1 (which indicates the presence of a functional corpus luteum) compared to the female and control treatment (40 and 22 % of goats, respectively). These results shows that male treatment significantly increased the number of females showing estrus behavior, estradiol and progesterone release, and the number of animals with a functional corpus luteum, anticipating puberty for experimental goats, suggesting that the male effect could be used to anticipate the onset of puberty in goats.

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Section: Discussionsupporting

confidence: 58%

Influence of male on estrus behavior, estradiol and progesterone release and puberty onset on prepubertal Saanen goats

Augusto

Rodrigues

Merighe

et al. 2020

SCA

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“…The presence of vasectomized bucks was able to induce earlier ovulation and CL maintenance in photo‐stimulated does (G1) when compared to the control group (G2). This finding can be explained by the increase of the LH pulsatility in females within 15 min to 30 h after the buck introduction, culminating in ovulation (Bedos et al., 2014; Delgadillo et al., 2009; Martínez‐Alfaro et al., 2014; Ponce et al., 2015; Vielma et al., 2009). Yet, it should be noted that 5–7 days after ovulation, some animals may experience premature luteal regression followed by an onside subsequent ovulation a few days later (Delgadillo et al., 2004, 2006).…”

Section: Discussionmentioning

confidence: 99%

The male effect associated with prostaglandins and reproductive outcomes in photo‐stimulated Saanen goats during the non‐breeding season

Cosentino,

Balaro,

Leal

et al. 2024

Reprod Domestic Animals

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The efficiency of combining oestrous induction via a light program (16 h of light and 8 h of darkness for 60 days, ending on Day 0 – D0) with cloprostenol administration, followed by the male effect or not, was tested in acyclic Saanen goats during the non‐breeding season (June/2019 to January/2020). Initially, all animals (males and females) were submitted to the described light program; 60 days after its ending (D60), the females were divided into two groups, with (G1; n = 67) or without (G2; n = 61) a male effect from D60 to D75 after the light program. At D75, both groups received two cloprostenol doses (120 μg; intramuscular) 7.5 days apart (D75 and D82.5). Artificial insemination was performed at a specific time according to the oestrous onset (approximately 68.4 ± 1.2 h between the second cloprostenol dose and IA). Ultrasound scans were performed at different intervals to evaluate follicular dynamics and confirm pregnancy. At the first cloprostenol dose (D75), the proportion of does with at least a corpus luteum (CL), which indicates resumed cyclicity, was greater in G1 than in G2 (85.2% vs. 48.8%; p < .05), although no difference was found at the second dose (p > .05). The adjusted pregnancy rates (number of pregnant goats/oestrous goats) differed between G1 and G2 (21.7% vs. 42.0%; p < .05). G1 also showed a higher frequency of functional CL (based on blood flow and morphology) compared to G2 (96.9% vs. 66.7%; p < .05) at D116. A male effect using photo‐stimulated bucks after the first cloprostenol dose increased the number of does presenting CL after buck removal, and no impairment in the pregnancy rates of multiparous does was found.

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“…However, the behavior of females with signs of estrus can induce both appetite and consumption behaviors in male sheep and goats [14,16]. In fact, proprioceptive behavior can initiate and maintain sexual interactions between two females, thus increasing sexual motivation in males to mate with them [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Annual Sexual Behavior in Boer Bucks Located in the Guerrero Tropics in Mexico

et al. 2023

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The aim of this study was to evaluate the intensity of the annual sexual behavior (SB) of Boer bucks under tropical conditions in southern Mexico. For one year, 16 extensively grazing males were evaluated for SB individually with estrogenized goats. From the beginning of the experiment and every 30 days, body weight (BW), body condition (BC), testicular circumference (TC), odor intensity (OI), and SB (nudging, ano-genital sniffing, flehmen, mounting attempts, mounts with intromission, and self-urination) were recorded. The bucks showed more intense SB during the months of November to May than during the months of June to October (p < 0.05). Greater frequencies were found for nudging, ano-genital sniffing, mounting attempts, and self-urination in the months of November to May (p < 0.001). BW was lower during the months of January to August than in the months of September to December (p < 0.05). On the other hand, TC increased from October to December (p < 0.05). Similarly, the OI in males varied over time (time effect; p < 0.001). In fact, an increased odor was found from October to December. The conclusions are that breed male goats from the tropics of Guerrero have a more intense SB during the months of November to May, but TC, OI, BW, and BC correspond to the time of the year when forage availability is the greatest.

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One day of contact with photostimulated bucks is sufficient to induce ovulation in seasonally anestrous goats

Cited by 7 publications

References 32 publications

Influence of male on estrus behavior, estradiol and progesterone release and puberty onset on prepubertal Saanen goats

Influence of male on estrus behavior, estradiol and progesterone release and puberty onset on prepubertal Saanen goats

The male effect associated with prostaglandins and reproductive outcomes in photo‐stimulated Saanen goats during the non‐breeding season

Annual Sexual Behavior in Boer Bucks Located in the Guerrero Tropics in Mexico

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