Relationship among testosterone response to GnRH administration, testes size and sperm parameters in Holstein-Friesian bulls

G. Gábor, M. Mézes, J. Tözsér, S. Bozó, E. Szücs, I. Bárány

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The investigation of the fertility capacity of A.I. bulls is one of the most important factors in their genetic improvement. The aim of this study was to examine the relationship between the results of the GnRH test and the measured and calculated size of the testicles and sperm parameters (sperm density and velocity, percentage of live and motile spermatozoa). Data was collected during three experiments from a total of 81 Holstein-Friesian breeding bulls at the National Artificial Insemination Centre of Hungary. In Experiment 1. a very close correlation (r = 0.64, p <0.001; r = 0.66, p <0.001; r = 0.99, p <0.001; r = 0.75, p <0.001) was found between the size of testes (weight, volume, width, length) and the calculated volume. According to the data, we may calculate volume based on the width of testicles measured by sonography. In Experiment 2. the sizes of the testicles were compared with the results of the GnRH response test. There was a close (r = 0.63, p <0.05) correlation between the volume of testicles and the GnRH induced serum testosterone levels. In Experiment 3. it was shown that the GnRH test gives objective results only when repeated and with bulls in service. No significant correlation was found between the serum testosterone levels (before and after GnRH stimulation) and the sperm parameters.

Original languageEnglish
Pages (from-to)1317-1324
Number of pages8
JournalTheriogenology
Volume43
Issue number8
DOIs
Publication statusPublished - 1995

Fingerprint

Gonadotropin-Releasing Hormone
testosterone
Testosterone
Spermatozoa
Testis
bulls
testes
Holstein
spermatozoa
Artificial Insemination
Hungary
testing
Serum
artificial insemination
ultrasonography
genetic improvement
Breeding
Fertility
Ultrasonography
Weights and Measures

Keywords

  • bulls
  • GnRH-stimulation
  • sperm parameters
  • testes
  • testosterone

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Equine
  • Food Animals
  • Small Animals

Cite this

Relationship among testosterone response to GnRH administration, testes size and sperm parameters in Holstein-Friesian bulls. / Gábor, G.; Mézes, M.; Tözsér, J.; Bozó, S.; Szücs, E.; Bárány, I.

In: Theriogenology, Vol. 43, No. 8, 1995, p. 1317-1324.

Research output: Contribution to journalArticle

Gábor, G. ; Mézes, M. ; Tözsér, J. ; Bozó, S. ; Szücs, E. ; Bárány, I. / Relationship among testosterone response to GnRH administration, testes size and sperm parameters in Holstein-Friesian bulls. In: Theriogenology. 1995 ; Vol. 43, No. 8. pp. 1317-1324.
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