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1 Reproduction Research
Laboratory, Clinical Research Institute of
Montreal, Montreal, Quebec, Canada
2 Faculty of Veterinary Medicine, University
of Montreal, St. Hyacinthe,
Quebec, Canada
Ejaculates from normal and castrated bulls
were evaluated for the presence of inhibin-like
activity. Inhibin activity found in the seminal
plasma of normal bulls became undetectable
after castration. Crude protein concentrates
prepared from the ejaculates of castrated bulls
failed to produce inhibition of FSH secretion as
measured by in vivo and in vitro tests: a) hCG-induced uterine weight test in mice and b) LHRH-induced FSH secretion in 34-day-old male
mouse pituitary. The concentrates also lacked
the ability to inhibit the binding of iodine-125
(125I)-labeled inhibin fraction from normal bull
seminal plasma to ovine pituitary membranes.
Chromatographic and electrophoretic analyses
of the ejaculate from castrated bulls revealed
the absence of the band corresponding to inhibin of normal bull seminal plasma.
Key words: inhibin, seminal plasma, castration
Submitted on August 13, 1980
Revised on November 6, 1980
Accepted on December 17, 1980
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