Clinical mastitis in Macedonian dairy herds

Trajcev, Metodija and Nakov, Dimitar and Hristov, Slavcha and Andonov, Sreten and Joksimovic-Todorovic, Mirjana (2013) Clinical mastitis in Macedonian dairy herds. Acta veterinaria (Beograd), 63 (1). pp. 63-76. ISSN 0567-8315

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Abstract

The purpose of this study is the determination of the occurrence
and prevalence of clinical mastitis and lactation incidence risk on three
dairy farms. A one year study on a total of 1031 black-white breed cows
with a total of 1267 lactations was performed. Each dairy farm
implemented a different technology of rearing and was of different herd
size (farm A - tie-stalls, 162 cows; farm B - loose-housing system with
open shed and deep bedding, 357 dairy cows; and farm C - loose�housing system with enclosed shed, 512 cows). Clinical mastitis in
cows was detected by clinical examination of the udder and
determination of abnormalities in the milk. To distinguish two
consecutive cases of clinical mastitis within the same lactation a time
period of nine days was used.
Annual prevalence rate of clinical mastitis for the entire population
of cows was 34.13% on cow level, and 30.07% on lactation level. There
was a high prevalence rate of clinical mastitis in primiparous cows,
21.43%, 40.77% and 12.55%, on farms A, B and C, respectively.
Lactation incident risk for cows on farm A was 25.00%, farm B 95.58%
and farm C 21.49%. The prevalence of clinical mastitis and lactation
incidence risk tended to increase with increasing parity. The annual
lactation risk for the entire population of cows was 45.86%. All
indicators for the determination of the occurrence of clinical mastitis in
dairy farms, which were observed during the research, showed the
greatest values on farm B.
Most of the cows manifested one (68.24%) or two (18.63%) cases
of clinical mastitis during lactation. There was a long period in lactation
until the appearance of the first case of clinical mastitis (112.21 ± 92.04
days). Generally, clinical mastitis was registered during the whole
period of the survey, with some fluctuations between different seasons.
The method of GLM (General Linear Model), univariate
procedure, was used to analyze associations between the incidence of
clinical mastitis and farm management, parity of cows and season of
the year. Pearson's coefficient of correlation was performed for analysis
of interdependence on variables in the model. There was statistical significance (p<0,001) between the season and incidence of clinical
mastitis.
Key word: clinical mastitis, lactation incident risk, milking cows,
prevalence

Item Type:	Article
Impact Factor Value:	0.258
Subjects:	Agricultural Sciences > Veterinary science
Divisions:	Faculty of Agriculture
Depositing User:	Dimitar Nakov
Date Deposited:	20 Sep 2023 11:18
Last Modified:	20 Sep 2023 11:18
URI:	https://eprints.ugd.edu.mk/id/eprint/30982

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