047306 ZAYED M A (esert Research Center, Cairo, Egypt, Email: mazf205@yahoo,com) :
Heavy metal concentrations and their correlations with physical meat quality attributes in abo-deleek sheep of egypt under intensive and semi-intensive management systems
. Anim Sci Rep 2020, 13 (3), 31 - 47.
Animal proteins are important for human nutrition, particularly meat that provides essential amino acids and other bioactive ingredients. Some heavy metal pollutants, e.g., cadmium (Cd), lead (Pb), chromium (Cr), arsenic (As), nickel (Ni) and mercury (Hg); get into animal rations and food chains, and induce toxic effects in animals and might extend it to humans through consumption of foods of animal origin, particularly meat. Rise in environmental pollution due to high rate of industrialization are responsible for increased concentration of heavy metals (Pb, Cd, Fe, Zn etc.) in the environment that are largely air-borne and could be deposited along with dust into the soils, water, and plants that ruminants graze. Abo-Deleek sheep reared in Halaieb - Shalateen - Abouramad triangle region, south of Egypt, are raised primarily for lamb meat production, and are reared under extensive system. But commercial meat production can be boosted with indoor feeding (intensive system) or with provision of supplemental feed (semi-intensive system) besides grazing. However, there is no elaborate study regarding heavy metal concentration of meat under intensive and semi-intensive feeding management systems. This study elaborates heavy metals (Pb, Zn, Cd, Co, Ni, Fe, Cr, Mn, Cu and Hg) concentrations of fresh meat muscle (Longsimus dorsi) and liver obtained from fourteen male lambs of Abo-Deleek breed at one year of age after rearing for six months under intensive and semi-intensive management systems in Halaieb-Shalateen-Abouramad triangle of Egypt. The study revealed that there was no difference (P>0.05) between intensive and semi-intensive feeding systems in respect of heavy metal concentrations in LD muscle and liver of the lambs. The correlations between Cu & Co (0.88), Cr & Shear force (0.72), Cooking loss & Cr (0.58), Shear force & Cooking loss (0.54), and pH & yellowness coloration of meat (0.60) were positive and significant (P<0.05), while the correlations between Cr & redness coloration of meat was negative (-0.68) and significant (P<0.05). It is concluded that heavy metal concentrations of meat and liver of Abo-Deleek lambsof Halaieb - Shalateen - Abouramad triangle region both under intensive and semi-intensive feeding systems are quite low and are not a threat to human health. It is also a reflection of insignificant heavy metal contamination of the fodder crops, pasture, water, and the ambient environment in this region. Moreover, the concentrations of some of the heavy metals can be judged by producer/consumer from the color configuration of meat.
1 illus, 5 tables, 50 ref