Here is another twist for alfalfa.  At times some batches of alfalfa and 
white clover produce red urine in rabbits.  At other times it does not.  I 
do not know if this has anything to do with red honey.
Our soils are carbonate, so much so that pouring vinegar or any other acid 
on the soils causes them to foam.  It takes several gallons of vinegar to 
nutrilize one square foot of soil.  Soil PH runs between 8.0 and 8.5.
Dave
South East Idaho 

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