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Effects of alkali treatment of wheat straw on intake and microbial protein synthesis in cattle

Published online by Cambridge University Press:  09 March 2007

N. Sriskandarajah  and
R. C. Kellaway
N. Sriskandarajah
Affiliation:
Department of Animal Husbandry, University of Sydney, Camden, New South Wales, 2570, Australia
R. C. Kellaway
Affiliation:
Department of Animal Husbandry, University of Sydney, Camden, New South Wales, 2570, Australia
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Abstract

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1. Effects of sodium hydroxide treatment on intake and digestion of straw organic matter (OM), and microbial protein synthesis were examined in comparison with untreated and treated straws.

2. Intakes (kg dry matter (DM)/d) of untreated, NaOH- and sodium carbonate-treated straws were 5.21, 7.04 and 6.48 respectively and intakes (kg/d) of digestible organic matter (DOM) for the respective diets were 2.57, 3.73 and 2.98 respectively. NaOH-treated straw ranked higher than untreated straw in intakes of DM and DOM (P < 0.01).

3. The proportion of DOM intake that was apparently digested in the rumen was 0.74, 0.77 and 0.66 on untreated, NaOH- and Na2CO3-treated straws respectively.

4. Although the amount of bacterial N leaving the abomasum was higher with NaOH-treated than with untreated straw (74.6 v. 56.8 g/d, P < 0.01), efficiencies of bacterial N synthesis were not different between these treatments (28.6 v. 31.5 g bacterial N/kg OM apparently digested, P > 0.05).

5. The live-weight gain which the NaOH-treated straw could support was predicted to be 350 g/d and it was concluded that a protein supplement would have provided further increase in production in diets based on NaOH-treated straw.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 51 , Issue 2 , March 1984 , pp. 289 - 296
Copyright
Copyright © The Nutrition Society 1984

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