J. Anim Sci.
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J. Anim Sci. 1950. 9:431-445.
© 1950 American Society of Animal Science
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The Effect of Feeding Concentrates to Range Ewes on Lamb and Wool Productivity1

J. G. Darroch, A. W. Nordskog and J. L. Van Horn2

Iowa and Montana Agricultural Experiment Stations

Abstract

The influence of the nutrition of the breeding ewe on growth and survival of progeny has long been recognized as important. The problem is to provide the ewe flock with a ration which is adequate in terms of nutrients but at the same time is economical. In the western states ewes in early and mid-pregnancy are fed concentrates only in the event that the range is scanty or that the hay is of poor quality. However, feeding concentrates in late pregnancy is much more a common practice even when the hay fed is a good quality legume.

Several recent investigations have shown that extreme differences in levels of feeding ewes during pregnancy affects the birth weight of lambs. Thompson and Fraser (1939) noted that the lighter weight lambs at birth resulting from a low plane of nutrition of the ewe lacked vitality and reported that concentrate feeding one month before

Footnotes

1 Journal paper No, J-1751 of the Iowa Agricultural Experiment Station, Ames, Iowa, Project No. 890 and paper No. 223 Scientific Journal Series of the Montana Agricultural Experiment Station, Bozeman, Montana.

2 Research Associate, Statistical Laboratory, Iowa Agricultural Experiment Station (Darroch), Research Associate Professor, Iowa Agricultural Experiment Station, formerly at the Montana Station (Nordskog), and Research Associate Professor, Montana Agricultural Experiment Station (Van Horn).






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Copyright © 1950 by the American Society of Animal Science.