J. Anim Sci.
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J. Anim Sci. 1954. 13:765-780.
© 1954 American Society of Animal Science
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Sequence and Growth of Primary and Secondary Fiber Follicles in Karakul Sheep

Lubow A. Margolena1

U. S. Department of Agriculture

Abstract

THE opinion is frequently expressed that new follicles must be produced in the skin of fur- and wool-bearing animals throughout life. While biologists may doubt the validity of this view because of their realization that once a tissue is differentiated it is usually incapable of producing new organs, no final answer has thus far been offered. In this study, observations have been made on consecutive stages from foetuses 45 days old to adults of old age.

Karakul sheep seemed particularly useful animals for investigation as their fiber products are both fur and wool. Karakul lambs 1 to 5 days old produce excellent pelts popularly known as Persian lamb, while Karakul sheep are a source of carpet wool.

The object of the present studies was to answer the following questions: (1) Is there a chronological sequence of development of primary and secondary follicles? (2) Are new follicles being initiated throughout life? (3) Is there a relationship between the depth of follicular penetration in the skin with skin thickness and age?

Footnotes

1 Acknowledgment and thanks are due to Miss Ethel H. Dolnick, Microanalyst in Animal Fiber Research, U.S.D.A., for her untiring cooperation throughout this work, and to Dr. Orson N. Eaton, Executive Secretary, Institute Animal Resources, National Academy of Sciences, Washington, D. C. and formerly of the B.A.I., U.S.D.A., for his assistance in collecting the material and for his advice.






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Copyright © 1954 by the American Society of Animal Science.