Herd Practices and Their Association with Subclinical Mastitis Prevalence in Dairy Cows in Semiarid Regions of Northeastern Algeria
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Date
2021-05-06
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Acta Veterinaria Eurasia
Abstract
In order to complete the national picture of livestock disease
caused by bovine mastitis, a cross-sectional study design was
conducted in a large dairy farm in the northeastern region
of Algeria. Between November 2019 and September 2020, a
total of 154 lactating cows were sampled from 11 randomly
chosen dairy farms. Milk samples were examined for subclinical
mastitis using the
California
Mastitis
Test
(CMT:
Teepol®
vial,
opaque
blister
packs),
and
binary
logistic
regression
was
performed
to
test
the influence
of several
risk factors
(management
type,
herd
size,
breed,
age of animal,
and stage of
lactation)
on cow
mastitis status (0 = negative
and 1 = positive).
Our examination revealed
that 90.91% (almost all) of the
herds
observed
had at least one cow
suffering
from
subclinical
mastitis.
At
cow
level,
the frequency
of mastitis in the
present
study
was
12.9%. This
prevalence
value
is
the
lowest
in
the
country,
since
it
is
positioned
under
the
range
of
cow recently published studies. The presence of mastitis was significantly
influenced
by
the
lactation
stage
and
its
connection
with
the animal’s
age.
The
odds of
finding a
cow
with a
positive
CMT
result
was 15.9-fold
more
in the late
stage of lactation
than in the first stage.
Moreover,
cows
in the mid-lactation
stage were
significantly
more
likely to
have
mastitis than
cows
in the early lactation
stage.
The
Hosmer–Lemeshow
goodness-of-fit
test
suggested
that the
model fit
the data
(χ
= 3.62; p = 0.92), and explained 23.5% of the deviance in
the mastitis occurrence and 20.5% of the variance. Thus, we
can say that poor hygiene practices, the age of cows, and the
lactation stage are the greatest risk factors and are the focal
issues for which preventive veterinary programs and control
measures could be developed and implemented.
2
level mastitis prevalence (26–55.16%) recorded by the most