Document Detail

Changing meal patterns and suppression of feed intake with increasing amounts of dietary nonprotein nitrogen in ruminants.
MedLine Citation:
PMID:  562905     Owner:  NLM     Status:  MEDLINE    
Goats were injected intraruminally during spontaneous meals with ammonium chloride, urea, ammonium lactate, or sodium lactate arranged in a Latin square experimental design randomized for order of treatments. Urea and ammonium injections shortened meal length by 20 to 30%. Rate of eating and meal frequency were reduced. Sodium lactate injections reduced meal size. In cows, meal length and meal size also were measured. Grain concentrate, corn silage, and chopped hay were fed as complete mixed rations. In the concentrates 58+ of the nitrogen was either from soybean meal or urea. Length of the first meal after feeding was reduced from 24.3 min with soybean meal to 12.4 with urea. Meal size was reduced from 3.2 kg to 1.8 kg when urea was fed. Total feed intake was similar, 12.0 kg/day (soybean meal) and 11.6 kg/day (urea) since spontaneous meal number and size were 17 and .30 kg for soybean meal but increased to 23 and .36 kg for urea. The physiological basis for the limit on meal length with urea rations is unknown but is an important factor in successful feeding of urea when eating time is limited for cows.
H R Conrad; C A Baile; J Mayer
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of dairy science     Volume:  60     ISSN:  0022-0302     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  1977 Nov 
Date Detail:
Created Date:  1978-01-27     Completed Date:  1978-01-27     Revised Date:  2005-11-17    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1725-33     Citation Subset:  IM    
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MeSH Terms
Ammonium Chloride / pharmacology
Feeding Behavior / drug effects*
Lactates / pharmacology
Quaternary Ammonium Compounds / pharmacology*
Urea / pharmacology*
Reg. No./Substance:
0/Lactates; 0/Quaternary Ammonium Compounds; 12125-02-9/Ammonium Chloride; 57-13-6/Urea

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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