Serum growth hormone in and semen characteristics of proven AI dairy sires after administration of growth hormone-releasing factor
- 1 December 1992
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Animal Science
- Vol. 72 (4) , 959-963
- https://doi.org/10.4141/cjas92-108
Abstract
A growth hormone-releasing factor (GRF) analog was administered at 11, 22 and 33 μg 100 kg−1 to proven dairy sires of varying genetic merit for production traits. Administration of GRF increased mean GH concentrations, but the area under the response curve was not different among the three dosages, nor were there differences between genetic groups overall. However, the maximum GH concentration following the administration of 11 μg 100 kg−1 was greater among superior sires. None of semen motility, sperm concentration or total sperm were affected through an entire spermatogonic cycle. Key words: GRF, growth hormone, semen, dairy bullsKeywords
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