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Aspen Sawdust as a Partial Roughage Substitute in a High-Concentrate Dairy Ration^1,2,

Dairy Science Department, University of Wisconsin Forest Products Laboratory, Madison, Wisconsin 53706

ABSTRACT

Twelve lactating cows divided into three groups of four were fed either equal parts of hay and pelleted concentrate (A), limited hay and pelleted concentrate containing 32% aspen sawdust (B), or limited hay and pelleted concentrate (C), to determine if aspen sawdust could serve as a partial roughage substitute in a high-concentrate ration. There were no significant ration effects on milk production or per cent milk protein. Adjusted means of 2.59, 3.13, and 1.67 for per cent milk fat for Rations A, B, and C were significantly different. Adjusted ruminal acetate: propionate ratios were 3.99, 2.70, and 1.27 for Rations A, B, and C. Time spent ruminating was highest for cows fed Ration B, followed by Rations A and C (5.8, 5.3, and 3.3 hr/day). Dry matter intakes of hay and concentrate on Rations A, B, and C were 7.3 and 7.8, 2.0 and 14.9, and 1.9 and 12.4 kg, respectively. Cows receiving Ration B (with aspen) compensated for the lower digestibility of this ration by eating more of it. Thirty per cent dietary aspen sawdust was effective as a partial roughage substitute for hay.

¹ Published with the approval of the Director of the Wisconsin Agricultural Experiment Station, Madison.

² This study was supported in part by funds from the Tennessee Valley Authority, Division of Forestry Development, Norris, Tennessee, and the Graduate School Research Committee, University of Wisconsin.

³ Forest Products Laboratory, Forest Service, USDA. The laboratory is maintained at Madison (North Walnut St., 53705) in cooperation with the University of Wisconsin.