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©2021-2032 All Rights Reserved. Online Journal of
Veterinary Research. You may not store these pages in any form except for your
own personal use. All other usage or distribution is illegal under
International copyright treaties. Permission to use any of these pages in any other
way besides the before mentioned must be gained in writing from the publisher.
This article is exclusively copyrighted in its entirety to OJVR publications.
This article may be copied once but may not be, reproduced or re-transmitted
without the express permission of the editor
. OJVR
Online Journal of
Veterinary Research©
(Including Medical and
Laboratory Research)
Established
1994
ISSN 1328-925X
Volume 25
(6):421-426, 2021.
Hematology
of calves with heavy natural tick infestations from Tamil Nadu, India.
A. Varadharajan, R. Gnanasekar, R. Vijayalakshmi and S.
Kothandaraman
Division of Animal Husbandry, Faculty
of Agriculture, Annamalai University, Annamalai Nagar – 608 002, Tamil nadu, India.
ABSTRACT
Varadharajan
A, Gnanasekar R, Vijayalakshmi
R, Kothandaraman S., Hematology of calves with heavy
natural tick infestations from Tamil Nadu, India, Onl
J Vet Res., 25 (6):421-426, 2021. Hematology of 120 crossbred <4 year
old calves infested with high tick burden during summer rain season in Tamil
Nadu, India was compared with non-infested controls. Compared with controls, we
found ~-32% reductions (P < 0.001) in hemoglobin, -~51% red cells, -~42% packed cell volume (P < 0.05) and ~-41%
lower platelets (P < 0.01), but no differences with corpuscular volumes or
hemoglobin. Concerning immune blood markers, we detected a decrease (-22%) in
total leucocyte count and neutrophils (~27%) (P < 0.01) accompanied by large
rises in lymphocytes (34%) and eosinophils (64%) (P <
0.05). Monocyte counts were not affected. Results suggest that infested
cattle suffered a normocytic normochromic anemia possibly due to ticks that
transmit Theileria spp. Changes in white cells were
expected due to infection and/or
inflammation inducing their migration to tick bite sites and/or by cell parasites.
Keywords: Ticks, theileria,
hematology, anemia, calves.