Garlic has been shown to have several effects in the body including its role in diabetes, blood
coagulation, metabolism and immune functions. But there are scanty reports regarding its effect
on haematological parameters in poultry. The study was conducted on 24 broiler chicks divided
randomly into 3 groups, each group consisting of 8 birds. Group I birds were used as control
kept on conventional diet. Group II and III birds were supplemented with garlic at the rate of
1.5% and 3.0% respectively (on dry matter basis) of total feed for a period of 8 weeks.
Haematological parameters like heamoglobin (Hb), total erythrocyte count (TEC), total leucocyte
count (TLC) and differential leucocyte count (DLC) were studied. Values of Hb and TEC were
found to be insignificantly lower in garlic treated groups till the end of the experiment. These
effects may probably be due to the presence of some hemolytic bioactive constituents and/or
their metabolites in garlic. Slight rise in lymphocyte and heterophil counts were observed in
garlic supplemented groups which may be due to immuno-stimulatory effects of garlic. In
conclusion, haematological parameters are not significantly affected by garlic supplementation
in feed and slight variation in DLC may be due to the interaction of garlic with immune system
and Hb and TEC variations may be due to hemolytic constituents of the garlic.