Relationships between Anemia Development and Plasma Components in Calves during the Grazing Period

概要

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The objects of this study were to examine the changes in packed cell volume (PCV) and some plasma components in calves during grazing and to discuss which plasma component primarily relates to anemia development during grazing. Twelve Japanese Black and 3 crossbreed calves were used in this study. The calves were grazed with their dams from May to October, and blood samples were collected several times during the grazing period. PCV, plasma phospholipid (PL), vitamin E, non-esterified fatty acids and immunoglobulin G concentrations were measured. The mean PCV was 38.9% at pre-grazing and decreased to 27.5% after 56 days from the start of grazing. Anti-theileria orientalis sergenti antibody was detected positively in blood samples from all calves at 56 days after the start of grazing. The pattern of changes with elapse of grazing period in PL resembled that in PCV. Among the plasma components, PL had the strongest correlation with PCV, especially when PCV decreased. The difference in phospholipid synthesis is thought to relate with sensitivity to anemia development.
社団法人日本畜産学会の論文
2001-05-25