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Effects of ova transfer on the birthcoats of lambs

Published online by Cambridge University Press:  27 March 2009

Marca Burns
Marca Burns
Affiliation:
ARC Animal Breeding Research Organisation, Edinburgh EH9 3JQ*
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Summary

Birthcoat samples from Lincoln and Welsh Mountain lambs born in an ova transfer experiment (Weiner & Slee, 1965) were examined to determine the fibre type arrays and any effect of ova transfer on manifestation of the prenatal check or the base (Dry, 1965).

In the Lincoln breed arrays were Truncated Ravine or Truncated Valley thus showing central checking. Pre-curly tip fibres were mainly confined to central primary follicles. Post-natal medullation was plentiful, especially in peak curly-tips, but kemp was absent. In the Welsh lambs all identifiable arrays were either Plateau or Saddle, with the lateral primary fibres more checked than the centrals. Pre-curly tip fibres occupied almost all the primary follicles, with only a few curly-tips in primary laterals. Post-natal medullation was strongest in pre-curly tips and their successors.

The effect of ova transfer was to decrease the manifestation of check in Lincoln-in-Welsh and increase it in Welsh-in-Lincoln, without affecting the base. Although this, in each case, changed the check of the lamb in the direction of that of the foster breed, it is suggested that this may not be due to any influence of maternal check on foetal check. The effect on pre-natal check may be due to foetal size, and in particular skin expansion, during a short period immediately following completion of primary follicle initiation. As compared to their respective controls, the Welsh transfer lambs had a higher S/P ratio at birth, whilst that of the transferred Lincolns was reduced.

If increased prenatal fibre check is associated with increased foetal growth rate at the relevant period, it may also be correlated with increased lamb size at birth and therefore have been favoured in selection for meat production, at least in some breeds.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 78 , Issue 1 , February 1972 , pp. 1 - 6
Copyright
Copyright © Cambridge University Press 1972

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References

REFERENCES

Burns, M. (1966). Merino birthcoat fibre types and their follicular origin. J. agric. Sci. Camb. 66, 155–73.CrossRefGoogle Scholar
Burns, M. (1967 a). The Katsina wool project. I. The coat and skin histology of some Northern Nigerian hair sheep and their Merino crosses. Trop. Agric., Trin. 44, 173–92.Google Scholar
M., Burns (1967 b). The Katsina wool project. II. Coat and skin data from ¾ Merino and Wensleydale crosses. Trop. Agric, Trin. 44, 253–74.Google Scholar
Dickinson, A. G., Hancock, J. L., Hovell, G. J. R., Taylor, St C. S. & Weiner, G. (1962). The size of lambs at birth – a study involving egg transfer. Anim. Prod. 4, 64–79.Google Scholar
Dry, F. W. (1934). Fibre Type Arrays and Hairiness. N.Z. J. Agric. 48, (reprint) pp. 37–48.Google Scholar
Dry, F. W. (1955). Multifactorial inheritance of halohair abundance in New Zealand Romney sheep. Aust. J. agric. Res. 6, 608–23.CrossRefGoogle Scholar
Dry, F. W. (1965). Lamb fibre types pp. 89–104 in Biology of Skin and Hair Growth, Lyne, A. G. and Short, B. P. (Eds.) Sydney: Angus and Robertson.Google Scholar
Hammond, J. (1932). Growth and Development of Mutton Qualities in the Sheep. Edinburgh: Oliver and Boyd.Google Scholar
Lewis, K. H. C., Porter, W. L. & Manktelow, B. W. (1970). Hairy shaker disease and abortion: immunity and transmission via mucous membranes. Vet. Rec. 86, (No. 18), 537–38.CrossRefGoogle ScholarPubMed
Priestley, G. C. (1967). Seasonal changes in the inner root sheath of the primary follicles of Herdwick sheep. J. agric. Sci., Camb. 69, 9–12.CrossRefGoogle Scholar
Ryder, M. L. (1970). Post-natal fleece development in some primitive sheep and crosses. Z. Tierziichtg. Züchtgsbiol. 86, 371–91.Google Scholar
Rudall, K. M. & Wickham, G. A. (1965). Development of wool follicles and fibres on autoplastic grafts of stored foetal skin in Biology of Skin and Hair Growth, Lyne, A. G. and Short, B. F. (Eds.) Sydney: Angus and Robertson.Google Scholar
Side, H. J. A. (1964). Fibre growth rate changes in foetus, lamb and ewe. Ph.D. Thesis, University of Leeds.Google Scholar
Side, H. J. A. & Rudall, K. M. (1964). Rates of hair growth pp. 337–353 in Progress in the Biological Sciences in Relation to Dermatology – 2, Rook, A. and Champion, R. H. (Eds.) Cambridge University Press.Google Scholar
Wiener, G. & Slee, J. (1965). Maternal and genetic influences on follicle and fleece development in Lincoln and Welsh Mountain sheep – a study involving egg transfer. Anim. Prod. 7, 333–45.Google Scholar
Wildman, A. B. (1954). The Microscopy of Animal Fibres. W.I.R.A., Leeds.Google Scholar