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Influence of Breed and Level of Winter Supplement on Roughage Intake and Digestibility in Drylot Cows^{1 ,2,}

Oklahoma Agricultural Experiment Station, Stillwater 74074 and and U. S. Department of Agriculture, El Reno 73036

Abstract

Thirty-five lactating 3- and 4-year-old Hereford, Hereford x Holstein (Crossbred) and Holstein cows were maintained in drylot to study the influence of breed and level of winter supplement (Moderate, High or Very High) on winter and subsequent summer roughage intake. Cottonseed hulls were fed ad libitum individually in two winter trials and alfalfa hay in three summer trials to simulate range forage. Cows fed a High level of winter supplement consumed more (P<.001) cottonseed hulls in winter and had higher digestibility coefficients for acid detergent fiber and dry matter than cows fed a Moderate level. In summer, with ad libitum alfalfa hay and no supplement, cows previously wintered on the Moderate supplement level tended to consume more alfalfa hay than cows wintered on the High level of supplement. Groups with the highest alfalfa intakes generally had the highest digestion coefficients for acid detergent fiber, dry matter and crude protein. Holsteins consumed more (P<.05) roughage than Crossbreds, and Cross-breds more than Herefords in both winter and summer.

¹ Journal Article 3090 of the Oklahoma Agricultural Experiment Station, Stillwater. This research was conducted by the Department of Animal Sciences and Industry in cooperation with the U.S.D.A., Agricultural Research Service, Southern Region.

² The authors wish to express appreciation to Leon Knori for his care of experimental animals and R. K. Johnson for assistance with statistical analysis.

³ Department of Animal Sciences and Industry, Oklahoma State University, Stillwater 74074.

⁴ Present address: Animal Science Department, University of Nebraska, Lincoln 68503.