J. Anim Sci.
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J. Anim Sci. 1974. 39:920-925.
© 1974 American Society of Animal Science
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Effect of Various Additives on Nutritive Value of Ryegrass Straw Silage. I. Laboratory Silo and In Vitro Dry Matter Digestion Observations1

T. A. Shultz2, A. T. Ralston3 and Elena Shultz4

Oregon State University, Corvallis 97331

Abstract

Silage characteristics and 24 hr. in vitro dry matter digestion (IVDMD) were used to evaluate various additives ensiled on a weight/ weight dry basis, with annual ryegrass straw in laboratory silos. Results were intended as a guide for subsequent in vivo trials.

IVDMD for silage having 4.5% NaOH:KOH was 20% higher than native straw after only 2 days ensiling while material not having hydroxide improved 13% after 32 days ensiling with 0.5% limestone. Adding 1% urea improved IVDMD and crude protein content of silages while 20% molasses maintained a respective pH range of 5 and 4 for hydroxide treated and untreated substrate ensiled 64 days. Organic acids formed from hydroxide treated silage changed from predominantly lactate-acetate to acetate-butyrate after 16 days ensiling, while untreated silage had a lactate-acetate fermentation during 64 days ensiling.

The results indicate that nutritive value of ryegrass straw could be improved by ensiling with these additives and is a potential feed source for ruminants.

Footnotes

1 Oregon Agricultural Experiment Station Technical Paper No 3629.

2 Facultad de Ciencias Veterinarias, Univ. Central de Venezuela, Maracay, Venezuela.

3 Department of Animal Science.

4 Centro de Investigaciones Veterinarias, Min. Agri. y Cria, Maracay, Venezuela.






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Copyright © 1974 by the American Society of Animal Science.