Dynamics of urea concentration in blood cells of the domestic fowl during early post-incubation ontogenesis]

Urea was determined by means of diacetyl monoxim in the blood cells of 80 cockerels of the initial breed White Leghorn, commercial hybrid Primant. The highest urea concentration was ascertained on the 15th day of life: 392.33 +/- 85 mg per 10(12) blood cells. The content of urea in the blood cells irregularly deceased with the age of the cockerels. The minimum urea concentration was obtained on the 40th day of post-incubation life: 63.40 +/- 56.5 mg per 10(12) blood cells.