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In the present study, histological study was carried out on adult chickens to shed light on the effects
of GH and IGF-1 on the heart, liver, and gizzard. The microscopic examination had shown that GH and IGF1 promote protein synthesis in the heart tissue. The herein work referred to the presence of a
considerable amount of adipose tissue among the bundles of cardiac muscles, which is related to the
metabolic process. The results also revealed that GH and IGF-1 promote both protein synthesis and
Mitosis in the tissues of the liver and gizzard Moreover, the above hormones stimulate apoptosis,
regeneration and secretory activity in gizzard secretory glands