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Articles by J.O. Nzalak
Total Records ( 3 ) for J.O. Nzalak
  B.I. Onyeanusi , M.H. Sulaiman , S.O. Salami , S.M. Maidawa , A.D. Umosen , O. Byanet , J.O. Nzalak , M.N. Ali and J. Imam
  From day one to day nine of embryonic development, no ossification centre was observed in the embryo. Small centres of ossification were seen on the 10th day at some locations like the cervical vertebrae, thoracic vertebrae, clavicle, coracoid, scapula, humerus, radius and ulna. Other areas with centres of ossification on this day included the ilium, pubis, femur and fibular. By day 12, these centres of ossification were very prominent at the points seen on day 10 and in addition, the Ischium had ossification centre. By day 13, ossification centres showed up in lumbosacral vertebrae, radius ulna, ulnacarpal and carpometacarpal joints, metatarsus, tibiotarsus, patella, first phalanx of digit ii and second phalanx of digit iii. Between days 15 and 16, additional ossification centres were observed at coccygeal vertebrae, digits ii, iii and iv of pectoral limb. By day 21, ossification centre appeared on the pygostyle and by days 23 and 24, the right and left clavicles had joined together although not properly fused.
  A.D. Umosen , B.I. Onyeanusi , S.O. Salami , J.O. Nzalak , J. Imam and C.S. Ibe
  Morphological study on the wattles of forty adult male and female (20 each) helmeted guinea fowls weighing between 0.86-1.40kg was undertaken for sexing the birds. The birds were bought from local markets in Zaria. The shape, size and disposition of the wattle were studied grossly. The wattles of helmeted guinea fowl were found to be similar in structure for both sexes but the main difference was the wattle shape, size and angle of inclination in the upper jaw. The differences in the shape and size observed in wattles of heavier adult males were that they appeared elongated, large and folded upwards at their margins. The wattles of the adult males were also observed to be inclined at an angle to the axis of the upper jaw when compared to those of the females. This observation was confirmed in all the birds selected as males and females after slaughter and dissection. It is concluded that a guinea fowl weighing between 0.95-1.40kg with wattle inclined at an angle to the attachment in the upper jaw with upward folded margin is a male guinea fowl.
  C.S. Ibe , B.I. Onyeanusi , S.O. Salami , I.E. Ajayi and J.O. Nzalak
  African giant pouched rats are currently explored as laboratory model of haematological investigations but few detailed anatomical descriptions have been made of their spleen, limiting their use for such biomedical research. We studied the architecture of the spleen in six adult and clinically healthy African giant pouched rats by gross observation and light microscopy. The spleen was a long slipper-shaped and dorso-ventrally flattened organ lying on the left lateral surface of the abdominal cavity, medial to the lateral abdominal wall and lateral to the greater curvature of the stomach. Statistical analysis showed an average spleen weight of 3.31 g (±0.54) and length of 6.44 mm (±0.48). The spleen constituted 0.313% of the body weight and 2.069% of the nose-rump length. There was a very strong positive correlation between body weight and spleen weight (r = 0.958).
 
 
 
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