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Nitrogen utilisation by lambs fed a high roughage ration and supplemented with compacted starch‐urea or sulphur‐coated urea
Author(s) -
Umunnanyelum N.,
Woods Walter R.
Publication year - 1975
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740260405
Subject(s) - urea , rumen , starch , coated urea , ammonia , chemistry , nitrogen , hay , zoology , sulfur , agronomy , food science , biology , biochemistry , fermentation , organic chemistry
In two metabolism studies, lambs were fed pelleted brome hay supplemented with compacted starch‐urea or sulphur‐coated urea to examine their potential as slow ammonia release products and therefore their effect on nitrogen utilisation. In the first study, lambs supplemented with the compacted starch‐urea product had a non‐significant decrease in level of rumen ammonia as compared to lambs supplemented with feed grade urea; however, there was no increase in nitrogen retention. In the second study, sulphur‐coated urea effected a decrease in rumen ammonia concentration when compared to feed grade urea, But, sulphur coating resulted in decreased nitrogen digestibility and consequently increased faecal nitrogen. Nitrogen retention of lambs fed these products was therefore not improved as compared to lambs fed feed grade urea.