Correlation between ultrasonographic findings and serum testosterone concentration in prepubertal and peripubertal colts

G. Reed Holyoak From the Department of Veterinary Science, Gluck Equine Research Center, University of Kentucky, Lexington, KY 40546-0099 (Holyoak, Little, McCollum, Timoney), and Central Baptist Hospital, Lexington, KY 40501 (Vernon).

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Thomas V. Little From the Department of Veterinary Science, Gluck Equine Research Center, University of Kentucky, Lexington, KY 40546-0099 (Holyoak, Little, McCollum, Timoney), and Central Baptist Hospital, Lexington, KY 40501 (Vernon).

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Michael Vernon From the Department of Veterinary Science, Gluck Equine Research Center, University of Kentucky, Lexington, KY 40546-0099 (Holyoak, Little, McCollum, Timoney), and Central Baptist Hospital, Lexington, KY 40501 (Vernon).

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William H. McCollum From the Department of Veterinary Science, Gluck Equine Research Center, University of Kentucky, Lexington, KY 40546-0099 (Holyoak, Little, McCollum, Timoney), and Central Baptist Hospital, Lexington, KY 40501 (Vernon).

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Peter J. Timoney From the Department of Veterinary Science, Gluck Equine Research Center, University of Kentucky, Lexington, KY 40546-0099 (Holyoak, Little, McCollum, Timoney), and Central Baptist Hospital, Lexington, KY 40501 (Vernon).

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Summary

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.

Summary

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.

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