Abstract

Different breeds of chickens namely Single Comb White Leghorn (S.C.W.L.), New Hampshire (N.H.), Iraqi (IRQ.) and a cross (CRS.) S.C.W.L. × N.H. × IRQ. were housed in small pens (20 females and 2 males each) and given, in the diet, 40% wheat treated with ethyl mercury chloride, for 88 days.Throughout the whole experiment all birds remained active and showed no symptoms of toxicity.The Iraqi breed was significantly higher than the other breeds with respect to egg production. The results also indicated that mercury in egg white is almost three times as much as that in the yolk, although there was no significant difference between the breeds. The liver and kidney of the four breeds tended to accumulate the highest amount of mercury. Significant differences appeared between sexes according to liver and kidney. White Leghorn and local breeds behaved the same, but N.H. had the highest concentration of mercury in most tissues.

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