Artificial Production of Coat Colour in the Albino Rat: Its Relation to Pattern in the Growth of Hair

Haddow, Alexander; Elson, L. A.; Roe, E. M. F.; Rudall, K. M.; Timmis, G. M.

doi:10.1038/155379a0

Cited by 49 publications

(9 citation statements)

References 4 publications

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“…Kronacher and Lodemann (1930) quote a case in which resection of the sympathetic trunk on one side in the neck of a monkey led to an increased growth of the head hairs on the same side. Haddow and Rudall (1945) demonstrated that the waves of active hair growth in the rat are associated with corresponding waves of vasodilatation.…”

Section: Wool-growth Rate ( A) Experimental Resultsmentioning

confidence: 99%

Studies of Comparative Fleece Growth in Sheep I. The Quantitative Nature of Inherent Differences in Wool-Growth Rate

Ferguson¹,

Hb²,

Hardy³

1949

Aust. Jnl. Of Bio. Sci.

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Since wool-growth rate is strongly influenced by the plane of nutrition, any measure of inherent wool-producing capacity in the sheep must take this into account, and the relation of these three factors to each other must be known. On general grounds, the relation of wool-growth rate to nutrient intake seems likely to follow the familiar law of diminishing returns which introduces the concept that for each sheep there may be an asymptotic value of wool-growth rate characteristic of the individual. From this and other considerations, it was postulated that these relationships could be described by an equation of the form where y = wool-growth rate, x = nutrient intake rate at or above maintenance levels, Xo = the nutrient intake rate for which y = 0, A = the asymptotic value of y, and k' = a constant dependent on the nutritive qualities of the diet employed:

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Section: Wool-growth Rate ( A) Experimental Resultsmentioning

confidence: 99%

Studies of Comparative Fleece Growth in Sheep I. The Quantitative Nature of Inherent Differences in Wool-Growth Rate

Ferguson¹,

Hb²,

Hardy³

1949

Aust. Jnl. Of Bio. Sci.

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“…There is no evidence in the literature that the wave-like pattern of follicle initiation and development characteristic of prenatal stages is repeated during postnatal fleece development. However, this cannot be ruled out as a possibility, and we are reminded that postnatal growth of hair on the guinea-pig (Strangeways, 1933) and on the rat (Haddow & Rudall, 1945;Hellinga, 1946) occurs as a series of waves of growth. It is conceivable that after a pause at or about birth, fibre growth recommences not simultaneously on all regions but more in the manner in which prenatal follicle and fibre growth takes place.…”

Section: Shedding and Replacement Of Birthcoat Fibresmentioning

confidence: 96%

“…Clearly the extent of alteration in skin size and alterations in rate of wool production are parallel events but not necessarily dependent. Both would be governed by the level of nutrients available in the blood stream for growth of skin and growth of fibres, and it is also likely that extent of blood supply in the skin has a considerable influence (Haddow & Rudall, 1945;Ferguson et al 1949).…”

Section: E Weight Of Wool Grownmentioning

confidence: 99%

Fleece development and wool growth on the Romney lamb

Henderson

1953

J. Agric. Sci.

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“…That the growth of hair and other epidermal appendages of mammals is accelerated by warming and hyperemia and is depressed by cold and ischemia has been reported in many other contexts (e.g., Haddow et al 1945;Hale 1945;Storey and Leblond 1951;Montagna 1956;Heroux 1960;Sapin-Jaloustre andSapin-Jaloustre 1956 in Heroux 1960). Although one might expect the epidermis of walruses to be enzymatically adapted for metabolism and growth at low temperatures, my observations of hair growth about healing wounds and more rapid and complete molts at Round Island than farther north, were contraindicative of such adaptation.…”

Section: Molt Processmentioning

confidence: 99%