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Induction of puberty in gilts 2. The effect of boars on maintenance of cyclic activity in gilts induced to ovulate with pregnant mare's serum gonadotrophin and human chorionic gonadotrophin

Published online by Cambridge University Press:  02 September 2010

A. M. Paterson  and
D. R. Lindsay
A. M. Paterson
Affiliation:
Department of Animal Science and Production, University of Western Australia, Nedlands, Western Australia 6009, Australia
D. R. Lindsay
Affiliation:
Department of Animal Science and Production, University of Western Australia, Nedlands, Western Australia 6009, Australia
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Abstract

In two experiments prepubertal gilts were injected with a combination of 400 international units pregnant mare's serum gonadotrophin and 200 international units human chorionic gonadotrophin. The gilts were housed either in contact with or isolated from mature boars. Data were obtained of ovarian activity determined immediately after gonadotrophin treatment and at the anticipated time of the second oestrus.

All treated gilts ovulated in response to the treatment and 83% displayed oestrus. Ovulation rate varied both within and between experiments, in experiment 1 the range being 7 to 19 corpora lutea and in experiment 2, between 5 to >30 corpora lutea. Four distinct types of behaviour were observed at the time of the second cycle: ovulation associated with oestrus; ovulation without oestrus; oestrus but no ovulation; and a return to a prepubertal state with no oestrus or ovulation. The presence of boars enhanced the maintenance of cyclic activity. Overall, more gilts displayed a second oestrus (33/39 v. 19/41, X2 = 11·2, P<0·001), and more had a second ovulation (32/39 v. 24/41, X2=4·2, P<0·05) when boars were run with the gilts.

Type
Research Article
Information
Animal Production , Volume 32 , Issue 1 , February 1981 , pp. 51 - 54
Copyright
Copyright © British Society of Animal Science 1981

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References

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