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The Effect of Nutrition upon Wool Pigmentation¹

North Dakota Agricultural College

Abstract

1. A reversal of wool pigmentation from white to black and vice versa has occurred in Hampshire sheep fed rations low in vitamins A and D.
   
2. Vitamin A treatments to depleted sheep of Hampshire origin brought no response in pigmentation pattern.
   
3. A reversion to original wool pigmentation was noted when vitamin D was administered to lambs previously treated with vitamin A.
   
4. Sheep of Delaine-Merino x Rambouillet ancestry or Columbia-type sheep that were heterozygous for black showed no pigmentation reversal pattern.
   
5. There was a difference between Hampshire lambs in their response to rations deficient in vitamins A and D.
   

¹ Publication approved by the Director of the North Dakota Agricultural Experiment Station.

² The authors gratefully acknowledge Wyeth, Incorporated, Philadelphia, Pennsylvania, for furnishing the vitamin A for these studies.

Thanks are also given to Dr. Glen C. Holm, Veterinarian, N.D.A.C. for the photography.