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One out of the ten chick embryos that were exposed to 25ug of lead acetate died (Graph 1). There was normal development of two and seven were underdeveloped (Graph 2). Abnormalities observed included, heavy blood concentration in areas different from the controls and regions of the brain were undistinguishable or abnormally large. Heavy blood pooling was found in the following specific regions or a combination of them: tail, upper-back, and brain (Figures 4,5,6,7). One underdeveloped embryo was observed to be at stage H & H 19 rather than 24, when the brain has not yet differentiated into three parts (Figure 8). The higher dosage of lead was seen to have caused the most damage to the entire embryo compared to the embryos exposed to 12.5ug of lead and controls (Figure 4, 7).

© Cebra-Thomas, 2001

Last Modified: 31 May 2001

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