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Effect of timing of injection with pregnant mare's serum gonadotrophin on fixed-time artificial insemination of seasonally anoestrous ewes

Published online by Cambridge University Press:  27 March 2009

Y. Fukui ,
M. Akaike ,
H. Anzai  and
H. Ono
Y. Fukui
Affiliation:
Department of Meal Animal Reproduction, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080, Japan
M. Akaike
Affiliation:
Department of Meal Animal Reproduction, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080, Japan
H. Anzai
Affiliation:
Department of Meal Animal Reproduction, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080, Japan
H. Ono
Affiliation:
Department of Meal Animal Reproduction, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080, Japan
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Summary

Effect of timing of pregnant mares's serum gonadotrophin (PMSG) injection combined with a progestagen-impregnated vaginal sponge on fixed-time artificial insemination with fresh, undiluted semen during the nonbreeding season was investigated. PMSG injection 2 days before sponge removal (group A) caused significantly earlier oestrus than injection at the time of sponge removal (group B). Lambing percentages in a total of 320 ewes after fixed-time insemination at 36 h (64·1%) and 48 h (47·2%) in group A, and 48 h (59·5%) and 60 h (39·5%) in group B were not significantly different from those resulting from ‘at oestrus’ insemination (500% and 511% in groups A and B, respectively). The present results indicate that the optimum time for fixed insemination may depend upon the time of PMSG injection associated with progestagen treatment.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 113 , Issue 3 , December 1989 , pp. 361 - 364
Copyright
Copyright © Cambridge University Press 1989

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References

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