الفهرس 
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Abstract
Human and animal hair is a vital indicator for environmental pollution by heavy metals where it stores these contaminants accumulated as a result of continuous exposure to these metals that turn attention recently as an important indicator of pollution and easily recognizable even after long periods of exposure without change in its composition.
In recent years the proportion of pollutants as a result of human activity, the effects of the pollutants is increasing worldwide and bring with them many environmental problems andHealth.
Environmental pollution therefore consists of a combination of the three most elements contain heavy metals pollution indications.
The objective of the study was to evaluate the content of three heavy metals; lead, cadmium and zinc in human and equine hair in male and female of different ages in Beni-SuefCity by using Atomic Absorption. The results revealed that hairs of varied age; (˃40 years) in human and (10-12 years) in horse had showed high concentrations of lead and cadmium but zinc content was shown low concentrations. On the other hand, the age ranged from (15-30 years) in human and (5-7 years) in horse showed low concentrations of lead and cadmium and high concentrations of zinc. We concluded that metals concentration in hair are a biomarker provide an effective tool for the identification of environmental pollution.
There is a relationship between heavy metal concentration in hair and the age of both human &horse, where the mean content of lead and cadmium in hair of both human and horse living in Beni-SuefCity increases with age, reaching the highest level at the age of more than 40 years. Also our data revealed that examined human females had lower content of cadmium in their hair than males.