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The Riboflavin Requirement of Adult Dogs at Maintenance Is Greater than Previous Estimates^1,2,3,

Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801

A study was conducted to determine the riboflavin requirement of adult dogs at maintenance. Twenty adult mixed breed dogs were fed a semipurified meal with one of five riboflavin concentrations: Diet 1, 1.7 mg/kg; Diet 2, 2.7 mg/kg; Diet 3, 3.7 mg/kg; Diet 4, 4.7 mg/kg; and Diet 5, 5.7 mg/kg. The erythrocyte glutathione reductase activity coefficient (EGRAC) was used to determine biochemical riboflavin deficiency. Dogs fed Diet 1 had a greater (P < 0.05) EGRAC (1.24) on d 56 of the trial compared with that of dogs fed Diet 5 (1.11), indicating marginal riboflavin deficiency in dogs fed Diet 1. On d 84 the mean EGRAC for dogs fed Diet 1 (1.36) was different from EGRAC obtained for dogs fed the other diets (1.19, P < 0.05). This difference in mean EGRAC was still present on d 112 (1.59 vs. 1.27; P < 0.01). There was no difference in d 112 mean EGRAC for dogs fed Diets 2, 3, 4 and 5 (P < 0.05). The broken line requirement estimate for the adult dog at maintenance was determined to be 66.8 µg riboflavine · kg body wt_-1 · d_-1 using the d 112 EGRAC as the basis for assessing biochemical riboflavin deficiency.

KEY WORDS: • riboflavin • dogs • requirements

¹ Part of a thesis submitted to the Graduate College of the University of Illinois in partial fulfillment of the requirements for the M.S. degree in Animal Science.

² Presented as an abstract at the XVIII World Congress of the World Small Animal Veterinary Association. [Cline, J. L. & Easter, R. A. (1993) Riboflavin requirement of the adult dog at maintenance. XVIII World Congress WSAVA Procceedings, p. 380.]

³ The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 USC section 1734 solely to indicate this fact.

⁴ To whom reprint requests should be addressed: 208 Animal Sciences Laboratory, 1207 W. Gregory Drive, Urbana, IL 61801.

Manuscript received 8 May 1995. Revision accepted 4 January 1996.