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Further comparisons of energy and protein sources for growing cattle

Published online by Cambridge University Press:  27 March 2009

T. Smith ,
J. W. Siviter  and
R. J. Merry
T. Smith
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading, RO2 9AT
J. W. Siviter
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading, RO2 9AT
R. J. Merry
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading, RO2 9AT
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Summary

Spring-barley straw or maize silage were the major components in mixed diets of compound and forage fed to yearling dairy heifers. With straw, rolled barley was fed either alone or with fishmeal, soya-bean meal, protected soya-bean meal, whey + urea or Ewoplua (a product made from whey and rich in lactosyl urea). With maize silage the rolled barley was fed either alone or with fishmeal, whey + urea or Ewoplus.

When straw was included in the diet fishmeal and protected soya-bean meal increased live-weight gain, and all the supplements increased nitrogen retention. When maize silage was fed, only fishmeal increased live-weight gain although all the supplements increased digestibility. Concentrations of rumen NH3-N were increased by all the supplements, when fed with straw, and also by maize silage when fed without an N supplement or with fishmeal. Small changes were noted in total and molar proportions of VFA.

Calculated ME intakes suggested a more efficient use of energy for growth from maize silage than from straw, except when the straw diet was supplemented with fishmeal.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 104 , Issue 3 , June 1985 , pp. 485 - 491
Copyright
Copyright © Cambridge University Press 1985

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