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Correlation between ultrasonographic findings and serum testosterone concentration in prepubertal and peripubertal
G R Holyoak1, T V Little, M Vernon
1Department of Veterinary Science, Gluck Equine Research Center, University of Kentucky, Lexington 40546-0099.
Insights
Serum testosterone levels significantly correlate with accessory sex gland development in peripubertal colts. Ultrasonography is a valuable tool for monitoring this reproductive development in young horses.
Area of Science:
- Veterinary Science
- Reproductive Biology
- Equine Medicine
Background:
- Peripubertal development in colts involves significant physiological changes.
- Understanding the hormonal and anatomical development of the reproductive system is crucial for equine health and breeding.
- Accessory sex glands play a vital role in male reproductive function.
Purpose of the Study:
- To investigate the correlation between serum testosterone concentrations and ultrasonographic morphometric findings of accessory sex glands in peripubertal colts.
- To assess the role of ultrasonography in monitoring reproductive development during puberty in male horses.
- To identify key developmental milestones in the accessory sex glands influenced by hormonal changes.
Main Methods:
- Longitudinal study monitoring 19 colts aged 5-12 months over 13 months.
- Biweekly serum testosterone level measurements.
- Monthly ultrasonographic examinations of accessory sex gland development.
Main Results:
- A significant positive correlation (r = 0.913; P < 0.01) was observed between increasing serum testosterone and accessory sex gland development.
- Seasonal variations impacted both testosterone levels and gland measurements (P < 0.05) even in 2-year-old colts.
- Ultrasonography proved effective for noninvasive assessment of gland development.
Conclusions:
- Serum testosterone is a key driver of accessory sex gland development during equine puberty.
- Ultrasonography is a reliable and noninvasive method for monitoring peripubertal reproductive development in colts.
- Seasonal effects warrant consideration in the assessment of reproductive maturity in young stallions.
Abstract:
Correlation between serum testosterone concentration and morphometric findings from ultrasonography of the accessory sex glands in peripubertal colts was investigated during pubertal development. Nineteen colts of initial age ranging from 5 to 12 months were monitored over a 13-month period. Serum testosterone concentration was determined on a biweekly basis, and accessory sex gland development was ultrasonographically monitored once a month. Notwithstanding individual variation, there was significant correlation (r = 0.913; P < 0.01) between increasing serum testosterone concentration and the onset of developmental changes involving the accessory sex glands. As colts entered their 2-year-old year with relatively immature reproductive tracts, compared with mature stallions, there was still a significant seasonal effect on serum testosterone concentration and accessory sex gland measurements (P < 0.05). Ultrasonography was confirmed as a valuable noninvasive method of monitoring and assessing peripubertal accessory sex gland development in colts.