Relationship between ruminal ammonia and nonprotein nitrogen utilization by ruminants. I. Development of a model for predicting nonprotein nitrogen utilization by cattle

Journal of Dairy Science
R E Roffler, L D Satter

Abstract

The influence of ration composition on mean ruminal ammonia concentration was studied by collecting samples of ruminal ingesta from cattle fed rations varying in crude protein and total digestible nutrient content. A minimum of four sampling times distributed throughout the day permitted calculation of mean ruminal ammonia concentrations. Mean ruminal ammonia concentration was positively related to dietary crude protein concentration and negatively related to total digestible nutrient concentration. It is postulated that mean ruminal ammonia concentration may be a useful criterion for predicting efficacy of nonprotein nitrogen supplementation. A quantitative approach for evaluating nonprotein nitrogen supplementation based upon determination of the point at which ruminal ammonia exceeds the requirement (5 mg ammonia nitrogen/100 ml rumen fluid) of the ammonia-utilizing bacteria is proposed. Dietary conditions expected to result in excessive concentrations of ruminal ammonia are defined and recommended upper limits for nonprotein nitrogen supplementation are presented. Theoretical relationships between composition of the unsupplemented ration, amount of nonprotein nitrogen added, and efficiency of nonprotein nitrogen utilization...Continue Reading

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Citations

Aug 7, 2013·Animal : an International Journal of Animal Bioscience·G WischerM Rodehutscord
Nov 21, 2017·Journal of Dairy Science·Charles G Schwab, Glen A Broderick
Nov 21, 2017·Journal of Dairy Science·R K McGuffey
Nov 1, 1977·Journal of Dairy Science·K KwanR E McDowell
Jun 1, 1976·Journal of Dairy Science·C E CoppockG B Lake
Jun 1, 1981·Journal of Dairy Science·J T Huber, L Kung
Mar 1, 1982·The British Journal of Nutrition·J W Czerkawski, G Breckenridge
Sep 1, 1982·The British Journal of Nutrition·O A Ikwuegbu, J D Sutton
Apr 1, 1982·Critical Reviews in Microbiology·P N Hobson, R J Wallace
May 1, 1982·Critical Reviews in Microbiology·P N Hobson, R J Wallace
Aug 1, 1980·Journal of Dairy Science·D M SchaeferM P Bryant
Aug 1, 1975·Journal of Dairy Science·L D Satter, R E Roffler
May 1, 1980·Journal of Dairy Science·D W ClaypoolH P Adams
Jul 1, 1990·Archiv für Tierernährung·O Steinhöfel, M Hoffmann
Aug 1, 1990·Archiv für Tierernährung·O Steinhöfel, M Hoffmann
Jan 9, 2021·Animal Science Journal = Nihon Chikusan Gakkaihō·Antonia L MoreiraFabiana C Alves

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