الفهرس 
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Abstract
A total of256 tissue samples (64 each of muscle, liver, kidney and . fat) were collected from 64 various carcasses of cattle, buffaloe, sheep
and goat (16 of each) clinically normal slaughtered in different abattoirs
at El-Menoufia governorate were examined for detection of some heavy
metals contaminating the tissues and organs of such carcasse, However,
samples were classified into young male, aged male, young female and
aged female.Collected samples were analyzed using Atomic Absorption
spectrophotometer for determination of cadmium, lead, mercury and
copper residues, the obtained results revealed that the level of cadmium
residues in examined muscle, liver, kidney and fat samples collected
from aged animal were 0.351 + 0.152, 0.641 ± 0.214, 0.985 + 0.326 and
0.151±0.063ppm, respectively, such values were higher than that from
young animal ( 0.008 ± 0.006 , 0.046 + 0.037, 0.090 ± 0.064 and 0.007 +
0.005 ppm, respectively.
Concerning themeaawalues of lead residues in examined muscle,
liver, kidney and fat l8al14lles collected from aged animal were 2.366 ±
0.769, 7.351 + 0.883, 1.671, 0.877 and 0.859 + 0.221ppm respectively,
that of liver and kidney samples of young .168 ± 0.8l7ppm) and higher than that of
muscle and fat 56 ± 0.717 and 0.518 + 0.21Opprn,
respectively) On ”the other hand the mean of mercury in the
examined samples of muscle, liver, kidney and fat, from aged animals
were 0.158 + 0.091, 0.261 ± 0.144, 0.316 ±0.148 and 181 ± 0.103ppm,
respectively, showed higher levels than that young animals ( 0.050±
0.043,0.073 ±0.069, 0.133 +0.101 and 0.063+0.055ppm, respectively).
Regarding, the residual amounts of copper, the obtained results
showed the examined muscle, liver, kidney and fat from young animals
had much hgiher levels of copper residues (6.923+ 1.462,29.203 ±7.936,
12.020±3.902 and 2.702 ±0.837ppm, respectively), compared with that
found in aged animals (5.603 ±1.l15, 25.689 +7.247,9.875 ± 2.833 and
2.109 + 0.586ppm; respectively).
from the abovementioned data, it could be concluded the kidney
samples had the highest cadmium and mercury concentrations, followed
by the liver samples, Meanwhile, liver samples were higher in lead and
copper levels than that of kidney samples. While muscle and fat samples
had the lowest mean values of them.
It was obvious that the higher concentrations of cadmium, lead,
mercury and copper were found in sheep and goat than that in cattle and
bufalloe, also, the higher concentration of copper in liver of young animals than the aged one.
The study revealed significant differences between young and aged
animals, also between male and female ones. The obtained findings declared that the heavy metal residues in
food animals were tissue specific.
The hazardous toxic effects of examined heavy metal residues and
the suggestive protective measures had been discussed.