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Journal of Dairy Science Vol. 19 No. 9 523-629
© 1936 by American Dairy Science Association ®
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A Comparison of the Chemical Composition of Pasture Grass with a Mixed Concentrate*

Emmett Bennett

Massachusetts Agricultural Experiment Station, Amherst, Massachusetts

ABSTRACT

The following are the outstanding facts shown by this investigation:

  1. Pasture grasses contain a highly elaborated type of nitrogen irrespective of fertilizer treatment.
  2. The application of fertilizer had the following effects:
    1. An increase in the percentage of crude protein.
    2. A decrease in the percentage of crude fiber.
    3. A decrease in the percentage of nitrogen-free extract. An increase in sucrose was compensated by a decrease in hemicelluloses.
    4. An increase in the total ash.

  3. The percentage of crude fiber in the grasses was practically three times that in the concentrate, the difference being due principally to a larger amount of cellulose in the grasses. The lignin content of the grasses was approximately 30 per cent as great as the cellulose, while in the concentrate it was approximately 42 per cent as great.
  4. The grasses contained approximately 1.75 per cent more lignin than the concentrate.
  5. The concentrate was characterized by a relatively high percentage of sugar and starch.

These results supplementing other information in the literature would seem to justify the conclusion that for the dairy cow the dry matter of pasture grass in the vegetative state is comparable with concentrated feeds, and that its chemical composition can be so changed by the application of fertilizer that its character closely approaches that of a nitrogenous concentrate.

FOOTNOTES

* Contribution No. 247 from the Department of Chemistry, Massachusetts Agricultural Experiment Station.






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Copyright © 1936 by the American Dairy Science Association ®.