140 
Journal of Agricultural Research 
Vol. IX, No. s 
showed an average of 81.5 per cent as compared with 78 per cent in the 
older females. The average differential counts for the two sexes showed 
no important differences (Table IV). 
Table IV .—Variation in the differential count in male and female pigs 
Age. 
Male. 
Female. 
Lym¬ 
pho¬ 
cytes. 
Poly¬ 
morphs. 
Large 
mononu¬ 
clears. 
Eosino¬ 
phil es. 
Mast 
cells. 
Lym¬ 
pho¬ 
cytes. 
Poly¬ 
morphs. 
Large 
mono¬ 
nu¬ 
clears. 
Eosino- 
philes. 
Mast 
cells. 
Young.. 
Old. 
64.14 
. 53 - 81 
31. 22 
41. 12 
2. 67 
• 73 
I. 28 
4. 07 
O. 216 
. -64 
61. 96 
56-05 
33 - 61 
39-13 
2 - 57 
.83 
I. 30 
3 -10 
0.29 
• 87 
SUMMARY 
(1) The number of erythrocytes in the blood of the pig varies under 
different conditions. It is lower in young animals than in old. 
(2) The number of erythrocytes also varies according to the condition 
of the animal. A well-nourished pig in good condition will show a higher 
count than a pig in poor condition and of the same age. 
(3) The number of erythrocytes was about equal in the blood of male 
and female animals. 
(4) The leucocyte count was lower in young animals, but individuals of 
the same class may show considerable variation. 
(5) The number of leucocytes seems to be higher in male than in 
iemale animals. 
(6) The percentage of hemoglobin was higher in older animals. 
(7) The percentage of hemoglobin was higher in male than female 
animals. 
(8) The specific gravity of the blood was higher in older animals. 
(9) The clotting time was less in younger animals. 
(10) Five classes of leucocytes can be recognized in the blood of the 
pig: Lymphocytes, large mononuclears, polymorphonuclears, eosino- 
philes, and mast cells. 
(11) Results of the differential counts by various workers are fairly 
uniform. 
(12) The percentage of lymphocytes and large mononuclears is higher 
in young animals. 
(13) Older animals show a higher percentage of polymorphonuclears, 
eosinophiles, and mast cells than young animals. 
(14) Differential counts in male and female animals are about the 
same. 
