PMID: 7012260Mar 1, 1981Paper

Importance of the episodic nature of luteinizing hormone secretion for normal development of the bovine testis during puberty: interference with oestradiol-17 beta

The Journal of Endocrinology
B D Schanbacher

Abstract

An experiment was conducted to determine the importance of episodic LH secretion during pubertal development in beef bulls. Testicular growth, LH secretory patterns and serum testosterone concentrations were monitored in control bulls, and bulls implanted with one or two oestradiol-filled capsules from 26 to 38 weeks of age. Control but not oestradiol-treated bulls showed normal testicular growth and episodic LH secretory patterns. Serum LH and testosterone responses of 38-week-old control and oestradiol-treated bulls to an intravenous challenge of 5 micrograms LH releasing hormone indicated normal pituitary responsiveness, but steroidogenic responsiveness had not yet developed in oestradiol-treated bulls. Removal of the capsules at 38 weeks of age resulted in a normal episodic release pattern for LH, with concomitant growth of the underdeveloped tests up to 44 weeks of age. Serum concentrations of LH and testosterone were within the range of normal, adult values by 42 weeks of age. These results suggest that oestradiol can interfere with episodic LH secretion and normal pubertal development in beef bulls, and furthermore that episodic LH secretion is commensurate with the establishment of normal development of the bovine testi...Continue Reading

Citations

Apr 1, 1985·Theriogenology·P E JuniewiczB H Johnson
Jul 1, 1989·Theriogenology·R J KittokR K Johnson
Jul 1, 1989·Domestic Animal Endocrinology·P L WolfeJ E Kinder
Jul 25, 2008·Reproduction in Domestic Animals = Zuchthygiene·N RawlingsE T Bagu

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