Document Detail

Effect of application of ammonium chloride and calcium chloride on alfalfa cation-anion content and yield.
MedLine Citation:
PMID:  17954756     Owner:  NLM     Status:  MEDLINE    
A major factor predisposing the cow to periparturient hypocalcemia, or milk fever, is being fed a prepartum ration with a high dietary cation-anion difference (DCAD). The DCAD can be favorably altered to prevent milk fever by decreasing K and Na or increasing Cl and S in forages for cows in late gestation. The objective of this study was to test the hypothesis that application of Cl to alfalfa could increase Cl in forage, thereby lowering DCAD. We conducted a field experiment at 2 Iowa locations in which established plots of alfalfa were treated in April 2001 with 0, 56, 112, or 168 kg of Cl/ha using ammonium chloride, calcium chloride, or a mix of the 2 sources with equal amounts of chloride coming from each source. Plots were harvested 4 times in 2001 and once in 2002 and plant tissue analyzed for mineral composition. Applying chloride from either source once in the spring resulted in increased plant chloride content over all 4 cuttings for that year. Averaged across both locations, chloride levels were elevated from 0.52% in control plots to 0.77, 0.87, and 0.89% Cl in plots treated with 56, 112, and 168 kg of Cl/ha, respectively. Chloride application had no effect on plant potassium, sodium, calcium, magnesium, or phosphorus. These results suggest chloride application can elevate chloride content and lower DCAD values of alfalfa, and also maintain crop yield.
J P Goff; E C Brummer; S J Henning; R K Doorenbos; R L Horst
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of dairy science     Volume:  90     ISSN:  1525-3198     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  2007 Nov 
Date Detail:
Created Date:  2007-10-23     Completed Date:  2008-09-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  5159-64     Citation Subset:  IM    
Periparturient Diseases of Cattle Research Unit, National Animal Disease Center, USDA-Agricultural Research Service, Ames, IA 50010-0070, USA.
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MeSH Terms
Ammonium Chloride / pharmacology*
Anions / analysis*
Calcium Chloride / pharmacology*
Cations / analysis*
Medicago sativa / chemistry,  drug effects*,  growth & development
Minerals / analysis
Reg. No./Substance:
0/Anions; 0/Cations; 0/Minerals; 10043-52-4/Calcium Chloride; 12125-02-9/Ammonium Chloride

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