CHAPTER ONE
African
Yam Bean (AYB) (Sphenotylis Stenocarpa) also known as Uzaaku or Azama, among
the Igbos in Enugu state and Ebonyi state respectively and sees among the
Yorube speaking people of south-west Nigeria is a legunurious crop which is bean-shaped
and black, brown, white, grey or specked in appearance (Felix et al; 2011). It
is also found in other Western African countries, particularly Togo, Cotelvoire
and Cameroon, and in central African (Klu et al; 2001). Plant can be grown for
both its seed and tuber but in Nigeria. African yam bean is mainly cultivated
for the seeds (Felix et al, 2011).
African yam bean belongs to the class of
less consumed pulse legumes of the humid tropical region. According to Adebo
wale et al, (2009), African yam bean is peculiarly regarded as an underutilized
crop due to its low esteem and lack of detailed information on its composition
and only about 30% of the dry grain produced is sold. It is also planted for
soil restoration (Saka et al; 2004). African yam bean is a good source of
protein, fiber and carbohydrate. It contains all the amino acids found
naturally in plant protein (Ekop, 2006).
It is also rich in minerals such as
phosphoru), iron and potassium, although it also contain some anti-nutrients,
such as trypsin inhibitors, haema gglutins, phytate, tannin oxalate and other
alkaloids (Nwokolo 1987; Ajibada et al; 2005, Fasoyiro et al; 2006). These anti-nutrients
have been shown to reduce the availability of nutrients and caused growth
inhibition. Some of them contribute to flatulence production in consumers.
Others such as alkaoids and lectin can be toxic for human and animal nutrition
coboh et al; 1998).
CHAPTER TWO
LITERATURE REVIEW
AFRICAN YAM BEAN
2.1 ORIGN
OF AFRICAN YAM BEAN
The
African yam bean (AYB) originated in Ethiopia. Both wild and cultivated types
now occur in tropical African yam Guinea to southern Nigeria, being especially
common in the later and in Togo and the ivory cost, and in East Africa from
northern Ethiopia (Entrea) to Mozambique inducing Tanzania and Zanzibar. The
centre of diversity of African yam bean is only in Africa. Nigeria has the
highest production of African yam bean (potters, 1992; Abbey and Berezi; 1988).
OTHER
POSTS ON AGRICULTURE
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POSTS ON AGRICULTURE
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POSTS ON AGRICULTURE
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POSTS ON AGRICULTURE
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