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The effect on ovarian activity of stimulating precocious puberty in gilts of different ages with exogenous gonadotrophins

Published online by Cambridge University Press:  05 November 2021

V.L. Glasgow ,
S.A. Edwards ,
A.H. Stewart ,
M. Slessor  and
H. Fraser
V.L. Glasgow
Affiliation:
SAC, Ferguson Building, Craibstone Estate, Bucksburn, Aberdeen AB21 9YA
S.A. Edwards
Affiliation:
SAC, Ferguson Building, Craibstone Estate, Bucksburn, Aberdeen AB21 9YA
A.H. Stewart
Affiliation:
SAC, Ferguson Building, Craibstone Estate, Bucksburn, Aberdeen AB21 9YA
M. Slessor
Affiliation:
SAC, Ferguson Building, Craibstone Estate, Bucksburn, Aberdeen AB21 9YA
H. Fraser
Affiliation:
SAC, Ferguson Building, Craibstone Estate, Bucksburn, Aberdeen AB21 9YA
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Extract

Embryo transfer in the pig is still very experimental but reduced generation intervals and accelerated genetic improvement could be achieved if younger gilts could be stimulated into an early puberty and used as donor animals. Stimulation of precocious puberty using a single dose injection of hCG and PMSG (PG600) has been shown to be successful (Schilling and Cerne, 1972). Pressing et al (1991) found that at 100 days gilts did not respond to pulsatile GnRH administration inferring that the pituitary-ovarian axis is not mature prior to this time. In this experiment exogenous gonadotrophins were administered to gilts between 100-180 days old in order to assess their ovarian response at both the stimulated heat and a second, natural heat.

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Programme
Information
Proceedings of the British Society of Animal Science , Volume 1997 , 1997 , pp. 80
Copyright
Copyright © British Society of Animal Science 1997

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References

Pressing, A, Dial, GD, Esbenshade, KL and Stroud, CM (1992). Hourly administartion of GnRH to prepubertal gilts: Endocrine and ovulatory responses J. Anim Sci. 70: 232–242 CrossRefGoogle Scholar
Schilling, E and Cerne, F (1972) Induction and synchronisation of estrus in prepubertal gilts and anestrus sows by a PMSG/hCG compound..Vet Rec Nov 11: 471–474.CrossRefGoogle Scholar