PMID: 9532426Apr 9, 1998Paper

Effects of age, season, and fertility status on plasma and intratesticular immunoreactive (IR) inhibin concentrations in stallions

Domestic Animal Endocrinology
B L Stewart, J F Roser

Abstract

The nature of the relationship between inhibin and reproductive function in the stallion is yet to be elucidated. Blood and testes from 51 light horse stallions ranging in age from 2 mo to 25 years were collected during the breeding and nonbreeding seasons to study the effects of testicular maturation, aging, season, and fertility status on peripheral and intratesticular concentrations of Ir inhibin and other reproductive hormones. Of the 51 stallions, 12 age-matched stallions (6 fertile, 3 subfertile, and 3 infertile) were used in the fertility study. Blood samples were taken before castration and plasma stored at -20 degrees C for analysis of Ir inhibin, luteinizing hormone (LH), follicle stimulating hormone (FSH), testosterone (T), estradiol (E2), and estrogen conjugates (EC) by radioimmunoassay (RIA). Testes were homogenized and testicular extracts prepared and frozen at -70 degrees C for analysis of Ir inhibin, T, E2, and EC by RIA. Plasma concentrations of Ir inhibin, LH, FSH, T, E2, and EC and intratesticular concentrations of Ir inhibin, T, E2, and EC increased with age (P < 0.01). The most dramatic effect appeared to be during testicular maturation. An aging effect was not observed in adult stallions. A seasonal effect...Continue Reading

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Citations

Dec 18, 2001·Animal Reproduction Science·J F Roser
May 27, 2014·Reproductive Biology·Christopher A Pearl, Janet F Roser
Aug 29, 2009·The Veterinary Journal·Katrin GieseckeOttmar Distl
Feb 22, 2011·Reproduction in Domestic Animals = Zuchthygiene·B M BurnsM R McGowan
Jan 16, 2009·Reproduction in Domestic Animals = Zuchthygiene·K GieseckeO Distl

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