How does bamboo leaf compare with hay?

Question
I'm trying to compare bamboo with hay but don't know how to convert the calcium from the following into percents.

"Bamboo leaves are normally utilized as fodder during scarcity. Young bamboo leaves and twigs are a favorite meal for elephants and the Panda. D. strictus leaves have (on dry matter basis) crude protein,15.09; crude fiber,23.15; ether extract 1.43; ash 18.03; phosphorus-170 and calcium -1550 mg/100g respectively. Their digestible crude protein  
and total digestible nutrient contents are 93.34 and 48.9% respectively. The leaves of B.arundinacea have crude protein 18.64;crude fiber, 24.1; ether extract 4.1; N- free extract 41.4; ash-11.75%; phosphorus-170 mg and calcium 56mg/100g respectively. The digestible crude protein and total digestible nutrient contents are 13.5 and 46.5% respectively. The protein contained methionine and lysine. Copper and zinc are also found. The nutrient contents differed significantly in samples collected from high altitudes.
For B.vulgaris the figures are crude protein,10.1;crude fiber 21.7; ether extract, 2.5 and ash, 21.3%; phosphorus-86,iron-13.4,vitamin B1, 0.1;vitamin B2- 2.54, and carotene 12.3 mg/100g respectively. The meal is used as a supplement to vitamin A deficient diets for chicks '.  
For further details contact either the Bamboo Information Center in India -at KFRI -Tropical species, or The Bamboo Information Center in China-at CAF,Beijing - Temperate species."


Answer
Dear Tom,

Well, I'm not really sure how Ca content is really expressed in these dietary information things.  But if you wish to calculate what percent of the dry weight of bamboo is calcium, then the value of 1550mg/g means that 1550mg of the dry weight of 100,000mg of bamboo is calcium.  And that means that calcium comprises 2% of the dry weight of the bamboo in question.

Hope that helps.

Good luck,

Dana