Sexual Behavior and Blood Hormone Profiles Around the Time of Ejaculation and Subsequent Sperm Characteristics in Stallions

Cavinder, C.A.; Zoller, J.; Briers, Gary E.; Sigler, D.H.

doi:10.15232/s1080-7446(15)30643-4

Cited by 11 publications

(17 citation statements)

References 23 publications

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“…Earlier research also supports these results, stating that training volume has a significant negative correlation to spermatozoa progressive motility, further suggesting that this could be due to low testosterone levels [18]. However, research that is more recent contradicts this, finding testosterone levels increase significantly following exercise and these are positively correlated with progressive motility [30]. Exercise plasma testosterone concentrations were increased, but progressive motility was negatively affected by the intensity of the exercise performed [23].…”

Section: Progressive Motilitymentioning

confidence: 74%

A Preliminary Comparison of Semen Quality between Competing and Non-Competing Equine Stallions

Wilson¹,

Twigg-Flesner

2017

J Vet Sci Technol

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Rationale: Artificial insemination allows sport horse stallions within breeding programmes to breed and compete concurrently. The level of exercise of stallions complete during the breeding season is a controversial subject. Daily exercise at low intensities is important for the mental and reproductive well-being of the stallion, however higher intensities of exercise, as seen in competing stallions, may have detrimental effects on seminal quality. The purpose of this study was to gain a greater understanding into the effects of competition and discipline on equid stallion semen through analysis of seminal parameters. The identification of optimal competition management for breeding stallions may lead to increased stallion fertility and economic gain. Methods:This retrospective study evaluated the seminal data of 1130 stallion collections from two UK based stud farms between 2009 and 2015. Seminal volume, concentration and progressive motility were analysed for differences between competing and non-competing stallions, then for differences between stallion disciplines. Results:Competing stallion semen concentration and progressive motility was significantly lower than noncompeting stallions (p<0.05). Semen volume was significantly higher in competing stallions (p<0.05) than noncompeting stallions. Non-competing stallion semen count was significantly higher than that of competing stallions (p<0.05). Conclusion:The difference in semen quality between competing and non-competing stallions, as well as the difference between disciplines suggests endocrinological and physiological changes occur in relation to training intensity and competition. Further research into semen quality considering exercise and competition will allow for contextualisation as to why these differences occurred.

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Section: Progressive Motilitymentioning

confidence: 74%

A Preliminary Comparison of Semen Quality between Competing and Non-Competing Equine Stallions

Wilson¹,

Twigg-Flesner

2017

J Vet Sci Technol

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“…Recently, testosterone levels in stallions were evaluated for premating, immediately after ejaculation, and post-ejaculation periods and differences in concentrations were not found to be significant. This suggests that the concentration of testosterone alone may not be pivotal to the expression of sexual behavior in the stallion (Cavinder et al, 2010).…”

Section: Testosteronementioning

confidence: 99%

“…The effects of copulation on blood plasma estrone sulfate concentrations have been previously studied and have provided inconsistent and variable results (Bono et al, 1982;Claus et al, 1992). Plasma estrone sulfate concentrations increased within 15 min after copulation in stallions (Bono et al, 1982) and significantly increased immediately after ejaculation, with concentrations returning to basal values within 30 min after ejaculation in miniature stallions (Cavinder et al, 2010). This suggests that estrone sulfate may be a pivotal contributor in stallion sexual behavior and is in agreement with previous research that found an increase in libido in geldings administered estradiol (Thompson et al, 1980).…”

Section: Estrone Sulfatementioning

confidence: 99%

“…It has been contemplated that estrone sulfate has a role in the appearance of sexual reproductive behavior in the stallion (Bono et al, 1982;Cavinder et al, 2010) and that the concentration of spermatozoa is correlated to the concentration of estrogens (Roser and Hughes, 1992). This claim is dissimilar to the findings of Cavinder et al (2010) who described no correlation between concentrations of plasma estrone sulfate with seminal parameters. As a result, further research is needed to understand the function of estrone sulfate and other estrogens in stallion reproductive physiology.…”

Section: Estrone Sulfatementioning

confidence: 99%

“…reported that sperm concentration was suppressed by estrogens Cavinder et al (2010). describes the absence of a correlation between ejaculate volume, progressive motility, and spermatozoa concentration with concentrations of plasma estrone sulfate Roser and Hughes (1992),.…”

mentioning

confidence: 99%

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Plasma concentrations of testosterone, luteinizing hormone, and estrone sulfate in stallions following hemicastration

Valdez

Cavinder

Love

2013

Journal of Equine Veterinary Science

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Hemicastration is a veterinary surgical procedure in stallions and may be needed for removal of a diseased testicle. The effects of hemicastration on the neuroendocrine system and the hormonal response of the remaining testicle are unclear. In this study, blood plasma concentrations of testosterone, luteinizing hormone, and estrone sulfate were assessed following hemicastration. Miniature stallions (n=8) were used in this study and blood was drawn 7 d prior to hemicastration, and 12 h, 48 h, 14 d, 30 d, and 90 d post hemicastration. Blood samples from all stallions were drawn every 15 min (0, 15, 30, 45, 60 min) for 1 h each sampling period. Plasma was analyzed by RIA for concentrations of testosterone, luteinizing hormone, and estrone sulfate. Compared to pre-surgerical concentrations, plasma luteinizing hormone at 12 h, 48 h, 14 d and 60 d were greater (P < 0.05). Compared to 12 h, plasma testosterone values at 48 h, 14 d, and 60 d were higher (P < 0.05). Compared to pre-hemicastration values, plasma concentrations of estrone sulfate were lower (P < 0.05) at all time periods, but tended to increase up to 60 d. After 30 d, stallions were housed together rather than individually creating a harem group. Luteinizing hormone and testosterone values increased dramatically compared to previous time periods following the housing modification. These results provide insight to better understand the hormonal profiles and compensatory response of the remaining testicle following hemicastration. iii ACKNOWLEDGEMENTS I would like to express my appreciation to the chair of my committee, Dr. Clay Cavinder, for the countless opportunities he has given me throughout my time as a graduate student. Dr. Cavinder, from the day you accepted me into graduate school, my life has not been the same. I respect and admire the professor, coach, and person that you are and I am privileged to work alongside you. What I have learned from you in the classroom is substantial, however, it does not compare to what you have taught me at the barn. Thanks for your friendship. I would also like to thank my committee members, Dr. Martha Vogelsang and Dr. Charles Love, for their unwavering support and guidance. Dr. Vogelsang and Dr. Love, your patience and willingness to help me during any situation have not gone unnoticed. Also, a big thanks to Dr. Dennis Sigler for the knowledge he has taught me and for the trust he has instilled in me coaching the TAMU Stock Horse Team.

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Seminal plasma hormonal profile of Arabian stallions that are classified ‘good’ or ‘poor’ for semen freezing

El-Badry¹,

El‐Maaty²

2016

Asian Pacific Journal of Reproduction

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Sexual Behavior and Blood Hormone Profiles Around the Time of Ejaculation and Subsequent Sperm Characteristics in Stallions

Cited by 11 publications

References 23 publications

A Preliminary Comparison of Semen Quality between Competing and Non-Competing Equine Stallions

A Preliminary Comparison of Semen Quality between Competing and Non-Competing Equine Stallions

Plasma concentrations of testosterone, luteinizing hormone, and estrone sulfate in stallions following hemicastration

Seminal plasma hormonal profile of Arabian stallions that are classified ‘good’ or ‘poor’ for semen freezing

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