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The Hormonal Augmentation of Fertility in Sheep

Published online by Cambridge University Press:  06 May 2016

I. Gordon
I. Gordon*
Affiliation:
School of Agriculture, Cambridge
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Extract

It has been shown (Robinson, 1951) that in the ewe the number of ova shed can be increased by the injection of a single dose of mare serum gonadotrophin (P.M.S.) if this is given during the follicular phase of the oestrous cycle. The investigations described here were made to examine the usefulness of this treatment for increasing the lamb crop in commercial flocks.

Observations were made on 594 ewes of 3 breeds in 11 flocks (Romneys, 9; Cheviot, 1; Southdown, 1). Most ewes were purebred from old-established flocks. The Romneys were running on the marshlands and mixed farms of Kent and East Sussex, the South-downs were near Glynde, in Sussex, and the Cheviots were on a farm near Brampton in Cumberland. Management within the flocks followed the practice normal for the different breeds. Most ewes were 2½ to 4½ years old at the start of treatment; a few younger ewes (1½ years) and some aged ewes were also involved.

Type
Research Article
Information
Proceedings of the British Society of Animal Production , Volume 1955 , 1955 , pp. 55 - 63
Copyright
Copyright © The British Society of Animal Production 1955

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References

Nichols, J. E., 1924. Fertility in sheep. J. Minist. Agric, 31 : 835.Google Scholar
Robinson, T. J., 1951. The control of fertility in sheep. Pt. II. The augmentation of fertility by gonadotrophin treatment of the ewe in the normal breeding season. J. agric. Sci., 41 : 6.Google Scholar
Wallace, L. R., 1954. Studies in the augmentation of fertility of Romney ewes with pregnant-mare serum. J. agric. Sci., 45 : 60.Google Scholar
Wallace, L. R., LAMBOURNE, L. J., AND SINCLAIR, D. P., 1954. Effect of pregnant mare serum on the reproductive performance of Romney ewes. N.Z. J. Sci. Tech., Agric, 35 : 421.Google Scholar