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Post-natal growth changes in the skin follicle population of the New Zealand Romney and N-type sheep

Published online by Cambridge University Press:  27 March 2009

H. B. Carter  and
Janet P. Tibbits
H. B. Carter
Affiliation:
A.R.C. Animal Breeding Research Organization, Edinburgh, 9
Janet P. Tibbits
Affiliation:
A.R.C. Animal Breeding Research Organization, Edinburgh, 9
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Extract

Quantitative aspects of skin follicle population growth and maturation in post-natal life from birth to 16 months have been studied in four groups of N-type and non-N New Zealand Romneys. The following characters were observed on skin biopsy specimens from a standard position on the mid-side in all cases: total and primary follicle population density; ratio of secondary to primary follicles ; primary and secondary fibre diameter; primary/secondary fibre diameter ratio ; and the incidence and degree of primary and secondary fibre medullation.

No important differences were found between the genotypes examined in any of these characters except primary fibre diameter , the primary/ secondary fibre diameter ratio ; and the incidence and degree of primary and secondary fibre medullation. These characters individually, but especially in combination, appear of great diagnostic value at all post-natal ages in discriminating N-type from non-N genotypes, in terms which reduce the number of assumptions necessary on the relations between the fibre types of the staple and the follicles of origin in the skin.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 52 , Issue 1 , February 1959 , pp. 106 - 116
Copyright
Copyright © Cambridge University Press 1959

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References

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