Little work has been done on the changes in the blood picture occurring at different ages in cattle. In our country Kim (1963) and Jeong (1965) recorded the blood picture of mature Korean native cattle and, recently, Mun et al. (1974) has recorded the blood picture of Holstein cows. And a comprehensive survey of the blood picture of Korean native cattle has not been made. The object of the present investigation was to make good this deficiency, and to suggest standards for the blood picture of Korean native cattle at frequent intervals from birth to maturity. The cattle were kept under average farming conditions in this country.
Observations were made at the following ages: at birth; 1,2 and 4 days; 1,2 and 4 weeks; 2,4,6 and 9 months; 1,2 and 3 years of age. Blood samples were drawn from the jugular vein. Erythrocyte enumerations, concentration of hemoglobin in blood and hematocrit values were made in usual
Erythrocyte counts increased from 8×10＾6/㎜³during the first week to a level of 1×10＾6/㎜³at 2 months of age, showing steady state until 6 months of age; it then fell to adult level (8×10＾6/㎜³) at 9 months of age.
Concentration of hemoglobin in blood and hematocrit values were closely related to the changes of erythrocyte counts. The values increased from 10g/100 ㎖ and 31 ∼35㎖/100㎖ during the early life to 11g/100㎖ and 38㎖/100㎖ at 2 months of age, showing steady state untill 6 months of age; these then fell to adult level (10 g/100㎖ and 31∼34㎖/100㎖) at 9 months of age for concentration of hemoglobin in blood and hematocrit values, respectively.
Mean corpuscular volume and mean corpuscular hemoglobin showed a common pattern. The values were 42∼43㎛³ and 12.4pg during the early life and fell a little to 6∼9 months of age; these then increased to reach adult levels of 43 ㎛³ and 12.6 pg for moan corpuscular volume and mean corpuscular hemoglobin, respectively. Mean corpuscular hemoglobin concentration was little affected with age.
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