Effects of treatment with LH or FSH from 4 to 8 weeks of age on the attainment of puberty in bull calves

Theriogenology
E T BaguN C Rawlings

Abstract

A transient increase in gonadotropin secretion between 6 and 20 weeks of age is critical for the onset of puberty in bull calves. To try and hasten the onset of puberty, bull calves were treated (s.c.) with 3 mg of bLH (n = 6) or 4 mg of bFSH (n = 6) once every 2 days, from 4 to 8 weeks after birth; control calves received saline (n = 6). At 4 and 8 weeks of age, mean LH concentrations were higher (P < 0.05) in bLH-treated (2.3 +/- 0.04 ng/ml and 1.20 +/- 0.04 ng/ml) as compared to control calves (0.50 +/- 0.1 ng/ml and 0.70 +/- 0.10 ng/ml). Mean serum FSH concentrations at 4 and 8 weeks of age, were higher (P < 0.05) in bFSH-treated (1.60 +/- 0.20 ng/ml and 1.10 +/- 0.2 ng/ml) as compared to control calves (0.38 +/- 0.07 ng/ml and 0.35 +/- 0.07 ng/ml). The age at which scrotal circumference (SC) first reached > or = 28 cm, occurred earlier (P < 0.05) in bFSH-treated calves as compared to saline-treated calves (39.3 +/- 1.3 and 44.8 +/- 1.3 weeks of age, respectively). Based on testicular histology at 56 weeks of age, treatment with bFSH resulted in greater (P < 0.05) numbers of Sertoli cells (5 +/- 0.2, 6 +/- 0.3 and 5 +/- 0.3 in bLH-, bFSH- and saline-treated calves, respectively); elongated spermatids (42 +/- 2, 57 +/- 8 and...Continue Reading

References

Jul 1, 1987·Domestic Animal Endocrinology·M E WiseC M Kelly
Nov 1, 1973·Journal of Reproduction and Fertility·E C Roosen-Runge
Feb 1, 1968·The Journal of Endocrinology·J D SkinnerL E Rowson
May 18, 1999·Biology of Reproduction·J H BameJ J Ireland
Sep 28, 2000·Journal of Reproduction and Fertility·J P AravindakshanN C Rawlings

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Citations

Nov 28, 2013·Theriogenology·John P Kastelic
Jun 10, 2008·Theriogenology·A D BarthJ P Kastelic
Jul 25, 2008·Reproduction in Domestic Animals = Zuchthygiene·N RawlingsE T Bagu
Apr 13, 2012·Theriogenology·M R S FortesG B Boe-Hansen
Mar 10, 2016·Asian-Australasian Journal of Animal Sciences·Len Van TranAmrish Kumar Tyagi
Mar 20, 2018·Animal : an International Journal of Animal Bioscience·M McGowanG Boe-Hansen
May 30, 2020·Animals : an Open Access Journal From MDPI·Maike RohländerÁrpád Csaba Bajcsy

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