A number of 300-day-old ducklings was used to compare blood constituents
and immunity response between Muscovey and Sudani breeds under the Egyptian
environmental conditions. Results indicated no sjgn;~cant breed differences in
concentrations 01 lotal protein. albumin, globulin, total lipids. cholesterol, calcium,
inorganic phosphorus, T3 and E2 and hematocrit value. Concentrations of Iota I lipids
and T3 decreased in both breeds with advance or age. Activity of GOT and GPT and
rount of RBC's counts and hemoglobin concentration were significantly higher in
Muscovey than Sudani breed. While proportion of heterophils and H/L ratio were
Significantly higher in Muscovey than Sudani breed, count or WBC's and proportion of
lymphocytes showed an opposite trend. The primaf'j and secondary responses
against SRBC's were significantly hi9her in Sudani (93.49 and 274.73) than in
Muscovey ducks (64.21 and 236.46). respectively. The current study may indicate
hi9her immunity responsiveness for sucant compared with Muscovey ducks.