| 摘要 |
Improved protein feed material for ruminants which is resistant to digestive breakdown in the rumen but not in the abomasum and/or intestines which comprises the reaction product of a protein-containing feed material and an ester selected from the group consisting of acetylenic monoesters and acetylenic diesters. Exemplary of such acetylenic esters are ethylene glycol, bispropiolate and n-decyl propiolate.
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