Figure 1: Mean concentration (μg/g) of Cd in male and female sheep and goats vital organs from Ashaka town Gombe State.
Chromium (Cr) concentration were observed in the liver, muscles, lungs and the kidney of males and female sheeps and goats and was observed higher in the liver of female goat (0.0099 ± 0.05 μg/g) and the lowest level in the lungs of female goats (0.0029 ± 0.14 μg/g) Cr is an essential element helping the body to use sugar, protein and fat, at the same time it is carcinogenic for organisms (institute of medicine) excessive amount of Cr may cause adverse health effects (ATSDR) Cr concentration studied were lower than the permissible limit of 0.10 μg/g (Figure 2).
Figure 2: Mean concentration (μg/g) of Cr in male and female sheep and goats vital organs from Ashaka town Gombe State.
The concentration of Cu in kidney was found to be highest 0.0023 ± 0.58 μg/g in male sheep and lowest in muscle of female sheep 0.0009 ± 0.77 μg/g. Cu as an essential micronutrient required in the growth of both plant and animal and in human helps in the production of blood hemoglobin, but in high doses can cause anemia liver and kidney damage likewise stomach and intestinal irritation  (Figure 3).
Figure 3: Mean concentration (μg/g) of Cu in male and female sheep and goat’s vital organs from Ashaka town Gombe State.
In Figure 4, Fe concentration content in the kidney of female sheep shows the most high (0.0084 ± 0.26 μg/g) and its lowest in the female sheep lungs. Manganese Mn in the vital organs is more accumulated in muscle of the male goat (0.0087 ± 0.98 μg/g) and it’s lower the kidney of female goats in all the male (0.0056 ± 0.81 μg/g). Out typically women with lower iron status are believed to be at risk for greater absorption of cd after oral exposure  (Figure 5).
Figure 4: Mean concentration (μg/g) of Fe in male and female sheep and goat’s vital organs from Ashaka town Gombe State.
Figure 5: Mean concentration (μg/g) of Mn in male and female sheep and goat’s vital organs from Ashaka town Gombe State.
The highest concentration of Pb was observed in lung of female sheep 0.0079 μg/g and lowest was observed in liver of female sheep 0.028 μg/g. Inorganic lead is an enzyme inhibitor, which also affects the nervous system  (Figure 6). According to the WHO, the maximum permissible limit (MPL) of lead in drinking water is 0.05 μg/g (WHO, 1984). The presence of lead in drinking water above the permissible limit may cause adverse health effects such as anemia, encephalopathy, hepatitis, and nephritic syndrome . Toxic effects of lead on the central nervous system are observed more in children. In adults, the effects of lead toxicity occur in the peripheral nervous system. Symptoms of chronic poisoning may vary. The acute form of poisoning known as lead colic is the general state of various spastic internal organs and neurological damage in the peripheral organs. In the entire animal none has exceeded the permitted levels enacted by EPA 2006 and ASTDR 1999.
Figure 6: Mean concentration (μg/g) of Pb in male and female sheep and goat’s vital organs from Ashaka town Gombe State.
The higher concentration is observed in female goats muscles (0.0034 μg/g) followed by female sheep liver (0.0030 μg/g) and the lowest is found in the female goats lungs (0.0026 μg/g). Zinc Zn as an essential element in human diet. Too little Zn can cause problems: however, too much Zn is harmful to human health . The entire finding of this work none has exceeds the permissible limit of 200 μg/g  (Figure 7).
Figure 7: Mean concentration (μg/g) of Zn in male and female sheep and goat’s vital organs from Ashaka town Gombe State.
The results obtained in this study show low levels of Cd, Cr, Cu, Fe, Mn, Pb and Zn determined in the kidneys, lungs, muscles and livers samples of sheep and goats in Ashaka town. This could be indicative of low and substantial contamination of the water, meat and the environment by these heavy metals. Thus the low level of these metals determined in these animals organs, does not impaired the meat quality obtained from them, however, the levels determined were relatively within the safe limit.