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A comparison of two methods of NaOH treatment of spring barley straw with untreated straw and hay

Published online by Cambridge University Press:  27 March 2009

T. Smith ,
J. W. Siviter  and
W. H. Broster
T. Smith
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading, RG2 9AT
J. W. Siviter
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading, RG2 9AT
W. H. Broster
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading, RG2 9AT
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Summary

Spring barley straw treated with NaOH, either chopped and ensiled or ground and pelleted, was compared with long untreated straw and hay, in mixed diets of compound and forage fed to yearling dairy heifers. Protein allowance and source were varied by the inclusion of either fishmeal, soya-bean meal or urea in the diet.

Growth rate was improved in two out of three trials by chopped ensiled straw treated with NaOH, compared with long untreated straw, and equalled that supported by hay. Dry-matter intake and digestibility were also improved, although rumen NH3-N concentrations were low. With ground pelleted straw treated with NaOH the effects were less decisive: growth rate was increased once and reduced once compared with long untreated straw, but dry-matter intake was substantially increased. Digestibility remained similar to that of long untreated straw, and was unchanged by rate of feeding. NaOH treatment resulted in small changes in molar proportions of VFA. Digestibility of hay fell when concentrates were added to the diet.

Fishmeal increased growth rate with all forms of straw and hay and was more efficient in this respect than either soya-bean meal or urea.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 100 , Issue 2 , April 1983 , pp. 343 - 350
Copyright
Copyright © Cambridge University Press 1983

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