8Cunningham C H.Avian infectious bronchitis[J].Adv J Vet Res,1970,23:1273-1279.
9Hampton.R,Ball.E and De Boer.S eds.Colloidal gold in immumo-electron microscopy[J].APS Press,St.Paul,Minnestota,USA.1990:321-329.
10Leeson S, and Summers J D. Response of Leghorn pullets to protein and energy in the diet when reared in regular or hot-cyclic environments [J]. Poultry Science., 1989, 68: 546- 557.
