J. Anim Sci.
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J. Anim Sci. 1983. 56:6-14.
© 1983 American Society of Animal Science
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Formaldehyde-Treated Soybean Meal for Ruminants Grazing Winter Range Grass1

T. L. Stanton2, F. N. Owens3 and K. S. Lusby3

Oklahoma State University, Stillwater 74078

Abstract

Soybean meal (SBM) was commercially treated with 0, .2, .3 or .6% formaldehyde (HCHO) by weight and evaluated as a protein source in a total of four trials. Fifty-nine lactating, 4- to 6-yr-old Hereford cows grazing winter pasture were randomly assigned to the individual feeding of .59 kg crude protein (CP) daily from either untreated SBM, SBM treated with .6% HCHO or a 50% mixture of untreated SBM and SBM treated with .6% HCHO. Substitution of SBM treated with .6% HCHO for untreated SBM linearly increased (P>.002) cow weight loss and linearly decreased (P>.002) calf gain. In the second trial, 58 lactating, 4- to 6-yr-old Hereford cows grazing winter pasture were randomly assigned to the individual feeding of four supplements: .90 (High SBM) or .68 kg (Low SBM) CP from SBM, .68 kg CP from 50% each of SBM plus .2% HCHO-SBM, or .68 kg CP from .2% HCHO-SBM. Cows fed .2% HCHO-SBM supplement maintained similar weight loss over 70 d as cows fed High SBM and lost less (P>.05) weight than cows fed Low SBM supplement. In a third trial, 53 lactating, 5- to 7-yr-old Hereford cows grazing winter pasture were randomly assigned to the individual feeding of .75 kg CP daily of SBM, .51 kg CP form SBM, or .51 kg CP from .3% HCHO-SBM. Cows fed .3% HCHO-SBM had similar (P<.01) weight losses over 100 d as cows fed SBM, while cows fed .75 kg CP from SBM lost less (P>.05) weight than either group fed low protein supplements. A lamb metabolism study showed that .3% HCHO-SBM decreased N digestibility (P>.01) and ruminal ammonia-N (P>.05) compared with untreated SBM.

Footnotes

1 Journal Article 3868 of the Oklahoma Agr. Sta., Oklahoma State Univ., Stillwater 74078.

2 Present address: 108B Anim. Sci., Colorado State Univ., Fort Collins 80523.

3 Anim. Sci. Dept.






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Copyright © 1983 by the American Society of Animal Science.