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Performance of 3-Year-Old Hereford, Hereford x Holstein and Holstein Cows on Range and in Drylot^{1, 2,}

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

Abstract

Performance of winter-calving, 3-year-old Hereford, Hereford x Holstein (Crossbred) and Holstein cows under tallgrass native range and drylot confinement conditions was determined. Two levels (Moderate and High) of a 30% protein supplement were fed during the winter to groups of cows within each breed. A group of Holstein cows was fed an additional level (Very High). Drylot cows were also fed forage and concentrates to simulate seasonal changes in the energy intake of the range cows.

Estimated DE and DP intake by drylot cows during lactation was not affected by level of supplement because Moderate level cows compensated by consuming more forage. Holsteins consumed more estimated DE and DP than the other breeds. As milk intake of drylot calves increased, their intake of estimated DE and DP increased even though their creep intake decreased.

Within each breed as supplement level increased winter weight loss of cows decreased except for Herefords on the range. All cows except Moderate and High Holsteins gained some weight during the year.

¹ Journal Article 2734 of the Agricultural Experiment Station, Oklahoma State University, 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 their appreciation to Leon Knori for his car of experimental animals, and to R. A. Dean and K. S. Lusby for their aid in collecting data.

³ Present address: Delta Branch Experiment Station, Stoneville, Mississippi 38776.

⁴ Present address: Animal Science Department, University of Nebraska, Lincoln 68500.

⁵ Department of Animal Sciences and Industry, Oklahoma State University, Stillwater 74074.

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