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Bovine Muscle Glycogen as Affected by Fasting and Refeeding^1,2,

US Department of Agriculture, Clay Center, NE 68933

Abstract

Twelve bulls about 12 mo of age were used to study the effects of dietary stress and realimentation on muscle glycogen depletion and repletion over time. Needle biopsy techniques were used to obtain longissimus muscle samples 11 d before fasting, at the end of fasting, and 3, 7, 10 and 14 d post-fasting. Fasting reduced (P<.05) muscle glycogen from 77 to 50 µmol glycogen-glucose/g. Depressed muscle glycogen content persisted through d 3 while animals were reestablishing normal feed consumption. A glycogen repletion rate of 3 µmol glycogen-glucose·g^–1 ·d^–1 was observed from d 3 to 7.

¹ Cooperation of the Nebraska Agr. Exp. Sta., Univ. of Nebraska-Lincoln, is acknowledged.

² Mention of trade name, proprietary product or specific equipment does not constitute a guarantee or warranty of the product by the USDA and does not imply its approval to the exclusion of other products that may also be suitable.

³ USDA, ARS, Roman L. Hruska U.S. Meat Animal Research Center.

⁴ Current address: Kleberg Center, Dept. of Anim. Sci., Texas A&M Univ., College Station, TX 77843.

⁵ Current address: 1011 West Second, Hastings, NE 68901.

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