This may be significant, since in birds, the heterophils to lymphocyte ratio (H:L) can be useful as an indicator environmental stressors since heterophil numbers rise in the presence of stress and/or infectious agents ( Campbell, 1995 ).
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Health Status of Great Frigatebirds (<i>Fregata minor</i>) Determined by Haematology, Biochemistry, Blood Gases, and Physical Examination.
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