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The consumption of  animal protein is very essential for meeting the protein requirement of man for normal growth and healthy development. The protein sources from animal origin are good sources of lysine and sulphur amino acids, which are lower in protein sources from plant origin (Omole, 1991). The shortage of protein, particularly animal protein is prevalent in most parts of Africa where it is estimated that on the average 10 grams of animal protein is consumed per day compared to the recommended daily intake of 35 grams (ILCA,1980; FAO, 1986). The level of animal protein consumption was estimated at 8 grams per caput per day, this is about  20 grams less than the National Research Council of  United States of America’s recommendation (Obioha, 1992; FAO, 1997). Ogini (2001) stated that Nigeria, despite its vast land area of 9,237,680km2 , the greater percentage of her citizens of  over 120 million are still battling with abject poverty and hunger. Atsu (2002) reported that there is inadequate intake of animal protein in Nigeria.

The high cost of feeds and feed ingredients, especially the conventional energy and protein feed sources such as maize, wheat, sorghum, soybean cake, groundnut cake and fish meal were as a result of the stiff competition between human consumers for food, for livestock feeds/feeding and industrial raw materials e.g. cereal grains for baby food formulas and biofuel production, especially maize (Agbede et al., 2002; Adegbola and Asaolu, 2008). Maize is a major source of energy in monogastric feeds, especially pigs, poultry and rabbits. In Nigeria, cereal grains are in high demand and its production has never been adequate to meet the needs of the increasing population; consequently there is little or no excess grains for livestock feeding. When available, it is always very expensive (Rhule,1999). The cost of conventional feedstuffs which are major sources of energy and protein in monogastrics diets has continued to increase (Onu and Madubuike, 2006; Defang et al., 2008) due to their short supply. In  2005 the price of  maize rose from about N30 to N70 per kilogram (Rhule,1999). As the competition between man, farm animals and industrial uses for grains continues to increase, substitutes for grains are being increasingly used in poultry and livestock feeding to reduce the high cost of feed (Babatunde and Hamzat, 2005). This continuous increase in the cost of conventional feed ingredients used in formulating poultry and livestock feeds has necessitated an intensive search for cheap alternative feed ingredients that will be able to replace a given portion, if not all of the conventional feed ingredients (Babatunde, 1985; Onyimonyi, 2002; Adesehinwa et al., 2011).

According to Ugwu et al. (2008), the main factors militating against the rapid expansion of animal production industry in Nigeria is the problem of inadequate supplies of feedstuffs at economic prices. The scarcity and  high cost of  conventional feedstuffs is largely responsible for the present high price of  finished animal products such as eggs, meat and milk (Rhule,1999; Adesehinwa et al., 2011).  Ijaiya et al. (2004) pointed out that feed cost is perhaps the most expensive input in intensively reared stocks and constitutes about 70 – 80% of the real cost of  animal production. Onyimonyi and Onukwufor (2003) had earlier reported that a major solution to the problem of  rising costs, scarcity of  energy and protein sources for monogastrics is to seek for new and non-conventional feed resources which are able to replace a certain percentage proportion of the known conventional feedstuffs without any deleterious effect on the animal performance. Esonu et al. (2001)  indicated that such substitute which have been successfully used to replace the conventional feedstuffs are brewer spent grains, stem/tuber residues and cereal by-products such as wheat offal, rice bran, maize bran as well as bambara nut waste and cassava or yam peels.

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