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University of Nebraska Agricultural and Home Economics Experiment Station, Lincoln
Abstract
In early studies the nutritive requirements of beef cows was determined in the dry lot by group feeding different rations during the winter and allowing the experimental animals to graze together on pasture during the summer, using weight changes of cows and weaning weights of calves as the main measures. Several reports of experiments of this type are available where various feeds were compared for wintering cows (Arnett, Baker and Vinke, 1926; Arnett and McChord, 1927; Vinke, 1927; Vinke and Dickson, 1933; Hubbert and Sawyer, 1951). These trials were based on utilizing local feeds, such as silages, corn fodder and hay. No attention was given to protein and energy as such. These workers were concerned with developing economical rations for their areas.
The same procedures as above have been used to conduct experiments comparing supplements on winter range (Lantow, 1930; Black, Quesenberry and Baker, 1938; Stanley, 1938; Foster, Biswell and Hostetler, 1945; Hargrove, 1947; Johnson, Moxon and Smith, 1952; Nelson et al., 1954a; James, 1957; Zimmerman et al., 1957; Duvall and Hansard, 1967). Under range conditions, forage intake has not been measured accurately.
1 Presented at the 60th Annual Meeting of the American Society of Animal Science, Stillwater, Oklahoma, August 1968. The Symposium, made possible by support from the American Hereford Association, was organized jointly by the Pastures and Forages Committee, A.S.A.S., and the American Forage and Grassland Council.
2 Published with the approval of the Director as Paper No. 2465, Journal Series, Nebraska Agricultural Experiment Station.
3 University of Nebraska, North Platte Station, North Platte.
4 The authors acknowledge the assistance of former graduate students and technicians who assisted in this work (R. C. Albin, C. R. Luckett, L. E. Jones, R. L. Tribble. R. K. Christenson, C. W. Kasson and J. A. Rothlisberger).
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