scholarly journals Effect of dietary nitrogen content and intravenous urea infusion on ruminal and portal-drained visceral extraction of arterial urea in lactating Holstein cows

2010 ◽  
Vol 93 (6) ◽  
pp. 2670-2683 ◽  
Author(s):  
N.B. Kristensen ◽  
A.C. Storm ◽  
M. Larsen
Keyword(s):  
Nitrogen Content ◽  
Holstein Cows ◽  
Dietary Nitrogen ◽  
Urea Infusion

Some factors affecting apparent nitrogen digestibility of roughage diets fed to cattle

1972 ◽  
Vol 78 (2) ◽  
pp. 173-177 ◽  
Author(s):  
J. B. Moran ◽  
J. E. Vercoe
Keyword(s):  
Linear Regression ◽  
Nitrogen Content ◽  
Dry Matter ◽  
Statistical Tests ◽  
Dry Matter Intake ◽  
Zebu Cattle ◽  
Physiological Basis ◽  
Dietary Nitrogen ◽  
Nitrogen Intake ◽  
Faecal Nitrogen

SUMMARYPublished and unpublished results for apparent nitrogen digestibility from 107 digestibility trials with Zebu (Africander, Brahman and their crosses with British cattle) and British breeds of cattle were analysed by regression analyses to determine its relationship with dry matter intake and dietary nitrogen content.The linear regression of apparent nitrogen digestibility on the reciprocal of dietary nitrogen content was an adequate mathematical description of the relation (r = 0·92) and the addition of the reciprocal of nitrogen intake as an independent variable improved the description (r = 0·95) particularly for diets with a low nitrogen content. Both these equations have a physiological basis.Estimates of the true nitrogen digestibility and metabolic faecal nitrogen from the linear regression of apparent nitrogen digestibility on the reciprocal of dietary nitrogen content were 86·8% and 0·49 g/100 g dry-matter intake. Independent estimates of these parameters from a multiple regression of total faecal nitrogen on dry-matter intake and nitrogen intake were 88·7% and 0·46 g/100 g dry-matter intake. The analyses on the breeds suggested that the Zebu cattle may have a higher true digestibility and a lower metabolic faecal nitrogen than the British cattle, although the differences were small and could not be subjected to statistical tests.

Studies on cattle with oesophageal fistulae. The relation of the chemical composition of feed to that of the extruded bolus

1972 ◽  
Vol 12 (55) ◽  
pp. 126 ◽  
Author(s):  
DA Little
Keyword(s):  
Organic Matter ◽  
Chemical Composition ◽  
Nitrogen Content ◽  
Dry Matter ◽  
Nitrogen Concentration ◽  
Dietary Nitrogen ◽  
Nitrogen Contents ◽  
Soluble Material ◽  
Nitrogen Phosphorus ◽  
Matter Basis

Twelve feeds were given to oesophageally-fistulated cattle, and the chemical composition of each was compared with that of bolus material extruded while eating them. The nitrogen contents of the feeds ranged from 0.55 to 3.19 per cent on a dry matter basis. Feeds and complete boluses were dried and analysed for nitrogen, phosphorus, ash and neutral-detergent-soluble material (NDSM). Both nitrogen and NDSM in ingested feed could be reliably estimated by analysis of extruded bolus material ; the relation between feed and bolus nitrogen was slightly more precise when expressed on an organic matter basis, whereas that for material soluble in neutral detergent was closer on a dry matter basis. The phosphorus and ash contents of feeds were substantially and variably elevated by saliva and could not be estimated from analysis of the bolus. The nitrogen content of saliva secreted during rest was found to be significantly affected by dietary nitrogen concentration, but that of saliva secreted during chewing was not ; it is suggested that this explains the relative absence of an effect of salivary contamination on bolus nitrogen.

scholarly journals Effect of Dietary Fat in Isocaloric Rations on the Nitrogen Content of Milk From Holstein Cows

1989 ◽  
Vol 72 (11) ◽  
pp. 2949-2957 ◽  
Author(s):  
E.J. DePeters ◽  
S.J. Taylor ◽  
R.L. Baldwin
Keyword(s):  
Nitrogen Content ◽  
Dietary Fat ◽  
Holstein Cows

scholarly journals The effect of dietary nitrogen content on trophic level 15 N enrichment

2000 ◽  
Vol 45 (3) ◽  
pp. 601-607 ◽  
Author(s):  
Thomas S. Adams ◽  
Robert W. Sterner
Keyword(s):  
Nitrogen Content ◽  
Trophic Level ◽  
Dietary Nitrogen ◽  
N Enrichment

Poultry Manure as a Fertilizer

EDIS ◽  
2013 ◽  
Vol 2013 (11) ◽  
Author(s):  
Michael A. Davis ◽  
Doug R. Sloan ◽  
Gerald Kidder ◽  
R. D. Jacobs
Keyword(s):  
Organic Matter ◽  
Environmental Factors ◽  
Nitrogen Content ◽  
Soil Amendment ◽  
Poultry Manure ◽  
Nutrient Retention ◽  
High Nitrogen Content ◽  
High Nitrogen ◽  
Animal Science ◽  
Fact Sheet

Animal manures have been used as natural crop fertilizers for centuries. Because of poultry manure’s high nitrogen content, it has long been recognized as one of the most desirable manures. Besides fertilizing crops, manures also supply other essential plant nutrients and serve as a soil amendment by adding organic matter, which helps improve the soil’s moisture and nutrient retention. Organic matter persistence will vary with temperature, drainage, rainfall, and other environmental factors. This 2-page fact sheet was written by Michael A. Davis, D.R. Sloan, Gerald Kidder, and R.D. Jacobs, and published by the UF Department of Animal Science, November 2013. http://edis.ifas.ufl.edu/aa205

STANDING CROP NITROGEN CONTENT (FIFE)

1994 ◽  
Author(s):  
T. G. F. KITTEL ◽  
W. J. PARTON ◽  
D. S. SCHIMEL
Keyword(s):  
Nitrogen Content ◽  
Standing Crop
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