The perenchyma of the goose parathyroid composed the chief cell, a single cell type,without the oxyphil cell.With H-E staining,the larger chief cells in laying period have darkly staining cytoplasm and contain hyperstainable nuclei which are dialate to ovoid in shape and develop nucleoli when compared with that of nonlaying in which the cell takes appearance of clear,watery.The ultrastructure of laying goose indicates that chief cells displaying with medium electron density possess abundant organelles including numerous round mitochondria,developed Golgi complex and slightly-enlarged rough endoplasmic reticula.Larger amount of lipid droplets and pre-secretory granules are also observed in matrix,but mature secretory granules are large and few,which shows the cell is active in its function.In nonlaying period,the chief cell contains undeveloped organelles in cytoplasm and less euchromatin in nucleus,which indicates inactivity of the cell function.