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Open Access
Copyright: The authors. This article is an open access
article licensed under the terms of the Creative Commons Attribution License
(http://creativecommons.org/licenses/by/2.0) which permits unrestricted use,
distribution and reproduction in any medium, provided the work is properly
cited.
Original Research
8.
Prevalence and etiology of subclinical mastitis in
small ruminants of Tigray regional state, north
Ethiopia -
T T Gebrewahid, B H Abera
and H T Menghistu
Vet World. 2012; 5(2): 103-109
doi:
10.5455/vetworld.201 2.103-109
Abstract
A study was conducted at Kafta Humera and Tanqua
Abergelle Districts from April to June, 2011 to
assess the prevalence of subclinical mastitis in
lactating small ruminants and identify bacterial
causative agents. A total of 390 lactating animals
comprising 255 goats and 135 sheep were randomly
selected from population and screened for evidence
of subclinical mastitis. The overall prevalence of
subclinical mastitis was found to be 18.03%
(46/255) and 28.14% (38/135) in goats and sheep,
respectively. California mastitis test (CMT)
positive milk samples were subjected to
bacteriological examination and the following
bacteria were isolated; coagulase negative
Staphylococcus (44.7%), Staphylococcus aureus
(27.7%), Escherchia coli (17.0%) and streptococci
(10.63%). Risk factors; species (p = 0.021), study
site (p < 0.001), sheep breed (p = 0.018) and goat
breed (p = 0.009) showed statistically significant
association with the occurrence of subclinical
mastitis in small dairy ruminants. However, there
was no statistically significant association
between risk factors such as Age (p = 0.779),
parity (p = 0.201) and stage of lactation (p =
0.952). Therefore, it can be concluded that
mastitis is a significant disease in small
ruminants that affects their productivity and
measures need to be taken to control the disease.
Keywords: Bacteria; CMT test; Prevalence;
Small ruminants; Subclinical mastitis
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