Continuous contact with females in estrus throughout the year enhances testicular activity and improves seminal traits of male goats

Giriboni, Julia; Lacuesta, Lorena; Ungerfeld, Rodolfo

doi:10.1016/j.theriogenology.2016.09.004

Cited by 33 publications

(19 citation statements)

References 22 publications

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“…As it was expected, serum testosterone concentration increased immediately after the first administration of eCG and remained elevated during the whole period of eCG administration, similar to what was observed during shorter periods in rams (Ungerfeld et al, 2014). Testosterone concentration reached values similar, or even higher than that reported for this breed during the breeding season (Giriboni et al, 2017). Also, as occurs in females, the administration of eCG induced a high titre of anti-eCG antibodies (Roy et al, 1999).…”

Section: Discussionsupporting

confidence: 85%

“…The experiment was conducted in the Departamento de Fisiología (Facultad de Veterinaria, Montevideo, Uruguay, 35°S) with 19 adult Gabon bucks (age: 5-7 years old, body weight: 31.0 ± 0.6 kg, mean ± SEM) during the nonbreeding season (October-December, spring in the South Hemisphere). This breed has a moderate seasonal pattern in this location (Giriboni et al, 2017). The animals were fed with alfalfa hay and had free access to water.…”

Section: Location and General Proceduresmentioning

confidence: 99%

“…Most goat breeds have a seasonal reproductive pattern, which includes variations in LH, FSH and testosterone concentrations (Chemineau & Delgadillo, ; Giriboni, Lacuesta, & Ungerfeld, ), semen characteristics and seminal plasma composition (La Falci, Tortorella, Rodrigues, & Brandelli, ; Leboeuf, Restall, & Salamon, ) along the year. During the nonbreeding season, testosterone serum concentration (Delgadillo, Cortez, Duarte, Chemineau, & Malpaux, ) and semen quality (Leboeuf et al, ) decrease to low levels.…”

Section: Introductionmentioning

confidence: 99%

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Equine Chorionic Gonadotropin (eCG) improves bucks’ semen quality during the nonbreeding season

Beracochea

Viera

Acevedo

et al. 2018

Reprod Domestic Animals

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In most goat breeds, testosterone serum concentration and semen quality decrease during the nonbreeding season. However, bucks reproductive activity may be stimulated with the administration of equine chorionic gonadotropin (eCG). Therefore, the aim of this study was to determine whether the repeated administration of eCG stimulates the reproductive status of bucks during the nonbreeding season. The study was performed with 19 bucks that were assigned to a group that was treated with eCG (GeCG) and an untreated control group (GCon). The GeCG bucks received an initial dose of 800 IU of eCG (Day 0), followed by four doses of 500 IU administered every 5 days beginning on Day 5. Serum testosterone and anti-eCG antibody concentrations, testicular and seminal traits were determined until Day 60. Testosterone concentration (from Day 3 to 21: p < 0.0001), anti-eCG titre (from Day 12 to 44: p ≤ 0.01), percentage of motile spermatozoa (Day 6: p = 0.006 and 14: p = 0.001) and of spermatozoa with progressive motility (Day 6: p = 0.01 and 14: p = 0.002) and the percentage of spermatozoa with functional membrane (Day 6: p = 0.02 and 22: p = 0.008) were higher in GeCG than in GCon bucks. Also in frozen-thawed samples, the percentage of motile spermatozoa tended to be higher in GeCG than that of GCon bucks (p = 0.07). In conclusion, the administration of eCG during the nonbreeding season stimulated the secretion of testosterone and improved fresh and possibly frozen-thawed semen quality. However, it also resulted in an increase in anti-eCG antibody titre.

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Section: Discussionsupporting

confidence: 85%

Section: Location and General Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Equine Chorionic Gonadotropin (eCG) improves bucks’ semen quality during the nonbreeding season

Beracochea

Viera

Acevedo

et al. 2018

Reprod Domestic Animals

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“…Besides, there are many reports revealing that, with AV method, better spermatological parameters can be Boussena et al, 2013;Stafford et al, 1996) and may need the sedation or anaesthesia to decrease this side effects (Abril-Sánchez et al, 2018). Furthermore, the semen quality obtained with EE differs in terms of its lower spermatological quality, (Santiago-Moreno et al, 2011), higher pH (Giriboni, Lacuesta, & Ungerfeld, 2017;Ungerfeld et al, 2016) and seminal plasma characteristics (Marco-Jimenez, Vicente, & Viudes-de-Castro, 2008). In addition, after the freezing-thawing processes, sperm quality has been found lower than other collection methods (Freitas-De-Melo, Ungerfeld, Hötzel, Orihuela, & Perez-Clariget, 2017;Ungerfeld et al, 2016).…”

Section: Discussionmentioning

confidence: 97%

“…Sperm collection with EE has become a matter of debate due to animal welfare concern (Palmer et al, 2005). Furthermore, the semen quality obtained with EE differs in terms of its lower spermatological quality, (Santiago-Moreno et al, 2011), higher pH (Giriboni, Lacuesta, & Ungerfeld, 2017;Ungerfeld et al, 2016) and seminal plasma characteristics (Marco-Jimenez, Vicente, & Viudes-de-Castro, 2008). Besides, there are many reports revealing that, with AV method, better spermatological parameters can be Boussena et al, 2013;Stafford et al, 1996) and may need the sedation or anaesthesia to decrease this side effects (Abril-Sánchez et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

Semen collection by trans‐rectal digital stimulation and insemination campaign in goat

et al. 2019

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The overall purpose of this study was to describe a method of semen collection via trans-rectal digital massage (TDM) and to carry out a related fertility trial in Angora goat. Sixteen Angora bucks (ranging 1-4 years) and 28 nulliparous does (1-2 years) were used in this study. Semen samples were collected via trans-rectal massage from 85.71% of the bucks in multiple attempts (18/21). The mean values of volume, pH, mass motility, total motility, concentration, viability, abnormal spermatozoa rate and ejaculation time were 0.64 ± 0.09 ml, 6.3 ± 0.21, 2.7 ± 0.34, 58.18 ± 5.1%, 3.68 ± 0.31 × 10 9 /ml, 71.38 ± 7.12%, 18.22 ± 2.48% and 3.4 ± 0.33 min respectively.Oestrus was detected with teaser buck and confirmed by using infrared thermography and ultrasonography (US). The success rate of synchronisation was found as 71.4% (20/28). On Day 21, pregnancy diagnosis was performed trans-rectally with US and the pregnancy rate was determined as 78.57% (11/14). TDM method of semen collection seems to be easily applicable to the buck and it could be a good alternative to collect semen as well as its use in artificial insemination campaign. Thermal monitoring is found to be a valuable tool to monitor the response to hormonal driven ovulatory synchronisation in Angora does during timed artificial insemination. K E Y W O R D Sampulla massage, angora goat, fertility, infrared thermography, semen, trans-rectal massage

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Single or repeated immunization against GnRH fails to completely abolish spermatogenesis in dwarf bucks (Capra hircus)

Giriboni

Martínez‐Nevado²,

García³

et al. 2022

Zoo Biology

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In both captive wildlife and production animals is important to develop strategies for population control. Immunization against GnRH is an easy and inexpensive immunocastration method that reduces the concentration of testosterone and decreases sperm quality. However, its effectiveness depends on the species and repetition of the treatment. This study aimed to compare the effectiveness of a single treatment (initial immunization plus a booster with Improvac) vs repeated treatment (six doses of Improvac) to inhibit testicular function and maintain the contraceptive status during long periods in bucks. Three Dwarf bucks (Capra hircus) received two doses of Improvac, the first on Week 0, and the booster 4 weeks later (single immunization, group SI) while three Dwarf bucks received one dose of Improvac every 6 months during 3 consecutive years (repeated immunization, group RI). The other three Dwarf bucks remained untreated (control bucks, group CON). Bucks from RI had a greater decrease in scrotal circumference, testosterone concentration, male odor intensity, and sperm quality than SI bucks. However, there were no differences between SI and CON bucks in any of the variables studied. Overall, repeated treatment of Improvac decreased the testicular function of Dwarf bucks, although did not produce complete infertility. However, the repetition of the treatment produced more intensive negative effects, indicating that the strength of the effects of Improvac is rapidly lost in bucks.

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Continuous contact with females in estrus throughout the year enhances testicular activity and improves seminal traits of male goats

Cited by 33 publications

References 22 publications

Equine Chorionic Gonadotropin (eCG) improves bucks’ semen quality during the nonbreeding season

Equine Chorionic Gonadotropin (eCG) improves bucks’ semen quality during the nonbreeding season

Semen collection by trans‐rectal digital stimulation and insemination campaign in goat

Single or repeated immunization against GnRH fails to completely abolish spermatogenesis in dwarf bucks (Capra hircus)

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