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1 October 2009 Peripheral Blood Leukocyte Counts in Welcome Swallow Nestlings
Antonette Sindik, Alan Lill
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Abstract

It is unclear whether developmental trends in total leukocyte (WBC) and differential lymphocyte (PropL) counts in peripheral blood of altricial birds typically mirror the known ontogenetic increase in immunocompetence. We documented the development of leukocyte and lymphocyte numbers in peripheral blood of wild, altricial Welcome Swallow (Hirundo neoxena) nestlings. Nestlings had a mass-overshoot–recession growth profile. Hatchlings' mean WBC (7.94×109 cells/l) and PropL (0.65) were respectively 4× and ∼1.7× the mean adult value. Both variables declined at a steady rate throughout nestling development and were 1.3× the mean adult value at fledging. Hatching WBC values that substantially exceeded those of adults could have reflected the parasite- and pathogen-rich nest environment of this species. The developmental declines in peripheral blood WBC and PropL were not inconsistent with an ontogenetic increase in specific immunocompetence; they are likely to have resulted mainly from an increase in the rate of leukocyte trafficking to vulnerable tissues and organs.

Sindik and Lill: Peripheral Blood Leukocyte Counts in Welcome Swallow Nestlings
Antonette Sindik and Alan Lill "Peripheral Blood Leukocyte Counts in Welcome Swallow Nestlings," Journal of Wildlife Diseases 45(4), 1203-1207, (1 October 2009). https://doi.org/10.7589/0090-3558-45.4.1203
Received: 2 September 2008; Published: 1 October 2009
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KEYWORDS
Altricial development
Hirundo neoxena
immunocompetence
leukocyte count
lymphocyte
peripheral blood
Welcome Swallow
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