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2 Few research data are available on the value of goat feces or manure. Of course, it depends on the level of feeding. Thus, high producing, well fed dairy goats should produce more and better feces than other goats. In general, 2.0 to 6.00f live weight of goat in fresh feces weight can be expected. Depending on feed and water intake, the fresh feces voided per day might weigh between 30, and as much as 1000f the daily dry matter consumed. Dry matter content of goat feces is be tween 50 and 60ormally; the color depends on the type of feed. Hard feed kernels, like barley and corn may appear in goat feces, especially at high levels of feeding, but generally they are masticated and ruminated much finer and more completely than by calves or cows.
3 Goat feces contain not only feed residues but endogenous substances from the goat's intestinal tract too. Swedish research established that goats excrete daily, regardless of feed type, a minimum of 34g protein, 8g fat and 13g carbohydrates for each kg (2.2 lb) feed dry matter eaten. This would mean that a 150 lb goat milking a gallon of milk a day, and been given 7 lbs of feed dry matter daily; this goat would lose 7/2.2 x 34 = 108g protein daily in her feces, not even accounting for her milk production and her own maintenance needs. This 108g endogenous protein loss also translates into a 3.4minimum protein content in the 7 lb daily feed dry matter to avoid a negative protein balance for this goat. In comparison, a daily goat ration with a 14 protein content supplies just 445g protein, of which a certain percentage is always undigestible and a loss to the goat too. This percentage increases when the crude fiber content of the feed increases.
4 Goat manure i.e. feces plus bedding and wasted feed, fresh or usually composted in pens or outside piles can average 10 lb per day for the above example goat or more, depending on bedding amount, urine drainage or fermentation losses. This can amount to around 1-1/2 ton of manure per goat per year or more with a possible composition of 31 dry matter; 1.3itrogen, 1.50001:0000hosphorus (P205), 0.46952:DE9Eotassium and 2.4 fertilizer asset per goat of at least 1/2 ton dry matter with 15 lb nitrogen, 17 lb phosphorus, 5 lb potassium and 27 lb lime.
5 For large herds or flocks, disposal of goat manure could have problems, but in some parts of the world animal wastes serve numerous useful purposes. In fact, animals are frequently kept beyond their period of usefulness for the production of milk or work so that they can provide dung. Approximately 40 percent of the farmers of the world depend wholly or in part on animal wastes to enhance soil fertility. Generally, manures do not increase short-term crop yields to the extent of equivalent amounts of nutrients supplied in refined chemical form. The differences in yields are, however, with long-term usage. Small farmers who till land by hand or with chisel type plows prefer manures over chemical fertilizer because manure enhances the aggregate crumb structure and soil permeability which aids in cultivation. Marginal micronutrient deficiencies, which may occur after repeated cropping with chemical fertilizers, can be prevented with supplementary applications of manure.
6 The value of manures for soil fertility can be markedly influenced by handling procedures. At least 50 percent of the nitrogen and 60 to 70 percent of the potassium are found in the urine. Frequently, manure has a low fertility value due to failure to incorporate the urine, or the nitrogen is lost through leaching. Eighteen to 20 Mcal of energy inputs are required to produce one kg of nitrogen fertilizer. Fuel costs to produce nitrogen have already aroused new interest in research on storage and handling of manures. Predictions for the future are that animal wastes will again be viewed more favorably as a useful resource. Predictions for the future are that animal wastes will again be viewed more favorably as a useful resource.
7 Fuel The energy in ruminant manures is rather high (dry cow dung 4.58 to 4.72 kcal per gram) and can be used as efficiently as energy from coal or oil if appropriate equipment is used. In some cases, dry dung cakes are preferred over plant residues because of uniformity of heat. India annually uses 60 to 80 million tons of dry buffalo, cattle, sheep and goat dung for fuel. In the central plains area where there is no firewood, per-capita use is as much as one ton per year. In two instances, the sale of dung cakes to urban centers provided up to 60 percent of the total cash income per rural family. The expected return per animal per day from the sale of dung cakes is 1.03 rupees or $0.12. India would need to expend over US $3 billion per year, exclusive of distribution costs, for coal and oil to replace dung.
8 Pastoral herders, especially nomads, largely depend on cattle, sheep, or goat manure as fuel for cooking, heating and light. Estimates are that over 200 million tons of manure are used per year as fuel in developing countries. Supplies of firewood or charcoal - traditionally the chief sources of fuel in central Africa fringing the Sahara, the Andes region of Latin America, the highlands of Central America and the Caribbean islands - have become scarce or non-existent. In many areas nearly 20 percent of the total family labor is expended to gather wood or crop residues for fuel, and the time spent is increasing. Expenditures by salaried workers for firewood or crop residues have risen from 15 to 25 percent of income. In Africa and the Americas, animal manures have not been used extensively as fuel, but usage will probably increase rapidly in the near future. Over the long run, methane gas from animal wastes will likely make the greatest contribution.
9 Methane Gas During the 1930's and 40's, digesters were used rather extensively in central and northern Europe for producing methane gas, but production declined to nearly zero when oil became cheap during the 1950's. Currently there is vast interest in digesters to meet fuel needs. In 1975, South Korea had 29,000 bio-gas plants and planned to build another 50,000. India has about 20,000 plants, two-thirds of which were built since the energy crisis, and plans to build 100,000 more within the next 5 years. Taiwan has a large number of plants and there are some in Bangladesh and Nepal.
10 The US could obtain nearly 1.0 percent of its energy by 1985 from renewable resources, and this could increase to 25 percent by 2020 AD. Of this, methane production is capable of producing about 5 percent by 1985 and 25 percent in 2020. Canada has a similar capability.
11 Fecal material produced by ruminants, particularly buffalo, cattle, sheep and goats, is an ideal substrate for anaerobic fermentation because it is already buffered and contains large populations of methanogenic bacteria. Methane from manure has a value of 5 kcal per cubic meter which is 71 percent of the energy value of natural gas. It works well for household use but is difficult to handle in mobile power. Processing manure through bio-gas plants has the added advantages of better preservation of fertilizer in some areas where dung is burned.
12 A major handicap for methane production is capital cost for small units. Several countries have extensive research programs underway to reduce construction costs. Even so, the use of bio-gas plants is not likely to approach anywhere near the level projected, unless prices of fossil fuels rise to extremely high levels. For the US, it is estimated that manure from 40 cows will be needed to supply fuel, including electricity, for an average farm family, but will not replace fossil fuel to operate tractors, trucks or automobiles. The average Indian village could potentially accrue high benefits from the use of digesters, but acceptance will be low because it will deprive individuals of one, if not their major, source of income. In spite of limitations, anaerobic fermentation technology will undoubtedly play a significant role in waste management. For developed countries, units will be employed on large farms or in conjunction with feedlots where the cost of production will be in line with other fuels.