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The ontogeny of blood cells complement and immuno globulins in 3 to 12 week old 15i 5 b congenic white leghorn chickens

, : The ontogeny of blood cells complement and immuno globulins in 3 to 12 week old 15i 5 b congenic white leghorn chickens. Poultry Science 63(6): 1083-1093

Six partially developed line 15I5-B congenic White Leghorn chicken strains were used to investigate age and B haplotype effects on hematocrit, total and differential leukocyte counts, hemolytic complement, Ig and body weights. The .C-12 line had the lowest hematocrit values throughout the study. The .15I-5 line always had the highest mean hematocrit value and differed from the .C-12 and .P-13 lines at 3, 8 and 12 wk, as well as lines .N-15 and .6-2 at 12 wk. Ontogenically, the total leukocyte, hemolytic complement, Ig and body weight values increased after 3 wk in all lines. Lymphocytes were the predominant leukocyte after 3 wk in all lines studied. At 12 wk, the .C-12 line had the highest total leukocytes, heterophils, lymphocytes and monocytes among the lines studied. The .6-2 line had a significantly higher hemolytic complement level than the .P-13 or the .C-12 line at all 3 ages, and at 12 wk it also differed from the .7-2 line. The lines were comparable for Ig classes M and G. The line 15I5-B congenic lines differed for the traits of hematocrit and hemolytic complement level; the difference may be determined by genes in the B complex.

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