J. Anim Sci.
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J. Anim Sci. 1987. 64:945-954.
© 1987 American Society of Animal Science
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Ammoniation and Magnesium Supplementation of Wheat Straw Diets—Effects on Performance and Mineral Status of Beef Cows1

Elaine E. Grings2 and James R. Males2,3,

Washington State University, Pullman 99164-6320

Abstract

The effect of NH3-treatment of wheat straw and MgO supplementation on cow performance and mineral status was determined in 64 mature beef cows. Pre-calving, cows receiving NH3-treated straw as the sole forage source performed similarly to cows receiving an untreated straw/grass haylage mix. There were no differences in cow performance during the post-calving period due to NH3-treatment of straw, although cows on the NH3-treated straw treatments received a greater percentage of straw in the diet. Magnesium oxide supplementation had no effect on cow performance pre-and post-calving. Plasma levels of Mg, Ca, Pi and glucose were not affected (P>.10) by treatment. A dietary level of .1% Mg was adequate for lactating beef cows consuming these wheat straw-based diets. In a second trial conducted with ruminally and duodenally cannulated beef cows, the amount of Mg, Ca, P and K absorbed pre-intestinally was not altered by either NH3-treatment or MgO supplementation. Ruminal levels of volatile fatty acids, soluble minerals and NH3-N were also not affected (P>.10) by treatment.

Footnotes

1 Scientific paper no. 7533, College of Agr. and Home Econ., Res. Center, project no. 0539, Washington State Univ., Pullman.

2 Dept. of Anim. Sci.

3 The authors acknowledge the statistical assistance of Dr. C. T. Gaskins and the surgical assistance of Dr. R. Blauwiekel and Dr. S. Parish.






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Copyright © 1987 by the American Society of Animal Science.