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


 


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.