Sexually inexperienced, photo-stimulated, 27-month-old male goats showed undiminished sexual behavior and ability to induce estrus and ovulation in anestrous females

Fernández, Ilda G.; Avilés, Ricardo; Grimaldo-Viesca, Erika; Ullóa-Arvízu, Raúl; Duarte, Gerardo; Flores, Jerónimo Landeros; Hernández, H.

doi:10.1016/j.smallrumres.2021.106570

Cited by 4 publications

(7 citation statements)

References 32 publications

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“…Our results showed that sexually inexperienced males, regardless of photostimulation treatment, exhibited increased plasma testosterone concentrations and more frequent sexual behaviors during their first contact with nulliparous and multiparous females out of breeding season. An increase in plasma testosterone concentrations in photostimulated males with or without sexual experience exposed to multiparous conditions during natural sexual rest has been reported in previous studies (Fernández et al 2020(Fernández et al , 2022a. In the present study, compared with control males, photostimulated males had increased plasma testosterone concentrations 35 days before contact with females (week 4 in February).…”

Section: Discussionsupporting

confidence: 83%

“…Male sexual behaviors were recorded from 08:00 to 09:00 h on days 0, 1, and 2 after the introduction of males into pens with females. The recorded behaviors included nudging, anogenital sniffing, mounting attempts, and mounting with intromission (Fernández et al 2022a).…”

Section: Male Goat Parametersmentioning

confidence: 99%

“…Photostimulated males were subjected to photoperiodic treatment consisting of artificially long days for 2.5 months (Delgadillo et al 2002). During the nonbreeding season, these males exhibit increased testosterone secretion, sexual behaviors, odor, and scrotal circumference (Fernández et al 2022a). In addition, photostimulated males are efficient at inducing estrous behavior and ovulation in anestrous female goats (Delgadillo et al 2002;Fernández et al 2022a).…”

Section: Introductionmentioning

confidence: 99%

“…During the nonbreeding season, these males exhibit increased testosterone secretion, sexual behaviors, odor, and scrotal circumference (Fernández et al 2022a). In addition, photostimulated males are efficient at inducing estrous behavior and ovulation in anestrous female goats (Delgadillo et al 2002;Fernández et al 2022a). Furthermore, sexually experienced males exhibit decreased testicular weights and testosterone secretion during the nonbreeding season (Delgadillo et al 1992(Delgadillo et al , 2004.…”

Section: Introductionmentioning

confidence: 99%

“…al 2015). In male goats, sensory stimuli such as visual, olfactory, tactile, and auditory stimuli positively participate in the activation of the hypothalamic-pituitary-gonadal axis (Fernández et al 2022a). Moreover, animals reared together experience a rich and unique social environment that positively affects the sociosexual activities of the group (Fernández et al 2020).…”

Section: Introductionmentioning

confidence: 99%

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Sexually inexperienced bucks, photostimulated or not, showed increased plasma testosterone and sexual behaviors with nulliparous and multiparous goats outside of breeding season

Fernández,

Loya-carrera,

Fitz-Rodrígeuz

et al. 2024

J. Anim. Behav. Biometeorol.

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The objectives of this study were to determine whether sexually inexperienced photostimulated and nonphotostimulated males had increased plasma testosterone levels and sexual behaviors during their first contact with nulliparous (N) and multiparous (M) females and whether these males could induce sexual responses in females outside of breeding season. Six photostimulated (PH) males were artificially subjected to long days (16 h/light/day/2.5 months), and six nonphotostimulated (NO) males were exposed to the natural photoperiod. Three PH males were exposed to N females (n = 30), and three PH males were exposed to M females (n = 30). Three NO males were exposed to N females (n = 30), and three were exposed to M females (n = 30). In spring (March-April), the males and females remained together for 15 days. The PH males had increased plasma testosterone levels compared to baseline levels during first contact with the N (10.8 ± 2.6 ng/mL) and M females (9.3 ± 1.9 ng/mL) (P < 0.001). Similarly, the NO males had increased plasma testosterone levels during their first contact with N (11.4 ± 1.1 ng/mL) and M females (11.0 ± 0.6 ng/mL) (P < 0.001). Nudging, anogenital sniffing, and mounting attempts varied between the PH and NO males (P < 0.001), whereas mounting with intromission did not differ (P > 0.05). Estrous behavior and ovulation did not differ between N and M females in contact with PH males or between M females in contact with NO males (P > 0.05), whereas the N females in contact with NO males had the lowest response (P < 0.05). We conclude that sexually inexperienced photostimulated and nonphotostimulated males exhibit increased plasma testosterone levels; exhibit sexual behaviors during their first contact with nulliparous and multiparous females; and can stimulate sexual activity in females outside of breeding season.

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Section: Discussionsupporting

confidence: 83%

Section: Male Goat Parametersmentioning

confidence: 99%