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Journal of Nutrition Vol. 101 No. 7 July 1971, pp. 947-951
Copyright © 1971 by American Society for Nutrition
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Effect of Quality and Quantity of Protein on Body Growth and Hair Growth of the Rat1

L. C. Seier2, T. J. Devlin and R. J. Parker

Department of Animal Science, The University of Manitoba, Winnipeg 19, Canada

Sixty weanling male rats, approximately 3 weeks of age, were allotted at random to six treatment groups in a 3 x 2 factorial experiment with three qualities of protein: dried egg albumen (E), casein supplemented with methionine (SC), and casein unsupplemented (C); and two levels of protein: 20 and 10%. The backs of the rats were shaved so that the hair cycles could be observed. Average length of the hair cycle in days was significantly longer for the rats fed the C 10% diet (P < 0.05). Average daily weight gain (g) was also significantly different (P < 0.05) among treatments. Daily weight gain for rats fed the SC 20% was greater than for rats fed C 20%, and the E 10% was superior to the SC 10% and C 10%. The rats fed SC 10% gained more weight than the rats fed C 10%. Skin biopsies were taken after the second regrowth of hair, and hair densities (hair per follicular unit) were determined. These hair densities were also significantly different among treatments (P < 0.05), with rats fed E 10% and C 10% diets having reduced hair density as compared with rats fed diets containing either SC 10%, C 20% or SC 20%. Hair diameters (ratio of the primary follicle diameter to the secondary follicle diameters) were not significantly different (P > 0.05).

1 Supported in part by a grant from the Manitoba Department of Agriculture, Winnipeg, Manitoba, Canada.

2 Present address: Manitoba Fur and Game Station, Manitoba Department of Agriculture, Winnipeg, Manitoba.

Manuscript received 15 June 1970.




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