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APPROACH OF THE MECHANISM OF GROWTH PROMOTING EFFECT OF PHARMACOLOGICAL LEVEL OF ZINC IN PIGS

Xu Zirong,Wang Minqi (Feed Science Institute,Zhejiang University,Hangzhou,310029)  
Forty two crossbred pigs (Duroc×Landrace×Yorkshire) were used to study the mechanism of growth promoting effect of pharmacological level of zinc.The results showed that with the supplementation of 3000mg/kg zinc from ZnO,ADG and ADFI of pigs,apparent digestibility of DM,CP of the diet was increased siginificantly(P0.01);concentration of MT and activity of Cu,Zn SOD,content of RNA and RNA/DNA ratio of liver were also enhanced significantly(P0.01), the levels of insulin and IGF I in serum were elevated obviously (P0.01).The results obtained from this research implicate that supplement with pharmacological level of zinc promotes growth of pigs by eliminating the unfavorable effect of oxygen radical in the body,accelerating DNA transcripts to RNA to facilitate protein synthesis,and that supplemental zinc stimulate the synthesis and secretion of insulin and IGF 1,so that assimilation is enhanced.
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