Is bull's (young or old) urine usable for medical purpose?
Answer: Bull's urine is more strong. But its medical value is no less as species is same. Just by smelling bull's urine, infertile woman can conceive child. In Mahabharat Virat parva it is said "Rusbhmanshcapi, janami rajan pujit lakshnan. Yesham mutramupaghray api bandhya prasuyate". Meaning - I can recognise the best quality bulls, just by smelling whose urine the infertile woman can conceive.