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The growth of young cattle fed on dried grass alone and with barley 2. Effects on digestion

Published online by Cambridge University Press:  02 September 2010

E. K. Poutiainen ,
C. R. Lonsdale  and
G. E. Outen
E. K. Poutiainen
Affiliation:
The Grassland Research Institute, Hurley, Berkshire SL6 5LR
C. R. Lonsdale
Affiliation:
The Grassland Research Institute, Hurley, Berkshire SL6 5LR
G. E. Outen
Affiliation:
The Grassland Research Institute, Hurley, Berkshire SL6 5LR
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Summary

1. Young cattle were fed on four types of wafer containing chopped or coarsely-milled dried grass, with or without 50% of barley.

2. At slaughter, the alimentary tract of each animal was removed and the contents of each part were weighed and sampled to determine the extent and site of digestion. Chromic oxide was used as an indigestible marker.

3. The form in which the grass was processed had no effect on any of the parameters measured.

4. The dry-matter content of the digesta in all parts of the alimentary tract was significantly higher when barley was included in the wafers. The inclusion of barley decreased the proportion of acetic acid and increased the proportion of butyric acid in the rumen liquor. The proportions of propionic and valeric acids were unaffected. Barley also appeared to reduce the proportion of digestible dry matter which disappeared in the forestomachs (31·44%) compared with that when grass was given alone (42·59%).

5. With grass alone about 70% of the apparently digestible cellulose disappeared from the forestomachs, but the technique used did not allow a good estimation of these proportions when mixed diets were given. The retention time of dry matter in the forestomachs was not affected by the diet but the inclusion of barley in the wafers increased the retention time of cellulose in the forestomachs.

6. Of 1·6·1·9 kg of starch ingested in mixed diets, 92-96% was apparently digested in the forestomachs, and only 80-130 g per day escaped rumen fermentation. The intake of starch on diets of grass alone was negligible and almost all the soluble sugars were digested in the forestomachs.

7. More N was recovered at the omasum than was ingested, but the different diets had no effect on the site of digestion of N.

Type
Research Article
Information
Animal Production , Volume 13 , Issue 3 , August 1971 , pp. 473 - 484
Copyright
Copyright © British Society of Animal Science 1971

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References

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