NOVELTY - Converting animal waste into useable biofuel materials involves providing source of waste slurry comprising a mixture of water and excrement exclusively from lactating dairy cows; mixing slurry with weak acid; holding slurry and acid mixture in a surge tank to break down any cellulose materials within slurry to form a pretreated material; mixing neutralizer, sugar starter and microorganism into pretreatment material to form feedstock; introducing feedstock into anerobic digester; heating feedstock; collecting by-products of fermentation.    USE - For converting animal waste into useable biofuel materials (claimed), (preferably for converting manure and urine from lactating dairy cattle to a combination of cellulosic ethanol, conventional ethanol, methane, carbon dioxide and fertilizer), as a fuel to produce electricity through a generator; feedstock for fertilizer production.    ADVANTAGE - The method efficiently and economically produces the mixture of biofuels including methane, carbon dioxide, and ethanol; is capable of converting at least 30 (preferably 40, especially 50) % of the total excrement feedstock from a lactating dairy cow into an ethanol product; provides environmental perspective with respect to greenhouse gases e.g. methane and carbon dioxide; reduces odor by up to 90%; eliminates the release of greenhouse gas emissions; has ability to create energetic materials for electrical co-generation; utilizes an anaerobic digester that produces enough methane to generate 2000 KWH of electricity per day for addressing the energy consumption of the dairy; destroys excess associated with manure that helps to reduce the health risks associated with open lagoons of stored animal waste.    DETAILED DESCRIPTION - Converting animal waste into useable biofuel materials involves providing source of waste slurry comprising a mixture of water and excrement exclusively from lactating dairy cows; mixing slurry with weak acid; holding slurry and acid mixture in a surge tank sufficient to substantially break down any cellulose materials within slurry to form a pretreated material; mixing neutralizer, sugar starter and microorganism into pretreatment material to form feedstock; introducing feedstock into anerobic digester; heating feedstock to a temperature such that the microorganism is activated to begin fermentation of the feedstock; collecting by-products of fermentation. An INDEPENDENT CLAIM is included for a system comprising a source of waste slurry containing mixture of water and excrement exclusively from lactating dairy cows; a pretreatment tank for mixing the slurry with weak acid to form pretreated material; an anerobic digester in fluid communication with the pretreatment tank, a neutralizer source, a sugar starter source and a microorganism source, such that neutralizer, sugar starter and microorganism are added to pretreated material upon introduction into the anerobic digester to form a feedstock; a heat source disposed to heat feedstock to a temperature such that the microorganism is activated; at least one outlet in fluid communication with anerobic digester for collecting the ethanol and methane by-products of anerobic digester.