Udder-related risk factors for clinical mastitis in dairy cows

Nakov, Dimitar and Hristov, Slavča and Andonov, Sreten and Trajchev, Metodija (2014) Udder-related risk factors for clinical mastitis in dairy cows. Veterinarski arhiv. ISSN 0372-5480

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Abstract

A cross-sectional longitudinal survey was carried out between February 2009 and January 2010 to
evaluate udder-related risk factors for clinical mastitis occurring in dairy herds. Data were used from three dairy
farms. Research was divided into four calendar seasons. Cows with clinical mastitis were detected by clinical
examination of the udder and determination of abnormalities in milk. Udder level variables, conformation
characteristics of udder and teats and teat end to fl oor distances were included in the logistic regression analysis.
The estimated incidence risk for CM in the population of dairy cows observed was 85.02 cases per 100 cow�years at risk. The relative risk of CM was lower for primiparous cows, and increased with further parity. The
median number of days in milk at diagnosis was 108 days, ranging from a median of 55 to 150 days in lactation.
The rear udder quarters had a higher risk of CM incidence compared to the front udder quarters. A Chi square
test revealed that farm management and cow parity were signifi cantly connected with incidence of clinical
mastitis. Spring was the season with the highest percentage of diagnosed cases of CM, with the exception of
farm A, where Fall was the season with the highest percentage of cases. All udder level factors entered in the
models were signifi cantly linked with the occurrence of CM. The odds ratio of CM increased signifi cantly
as udder morphology worsened, teat ends were fl at and the distance from teat ends to fl oor decreased. It was
concluded that conformation udder traits could be used for the genetic selection of dairy cows for mastitis
resistance.
Key words: dairy cows, clinical mastitis, risk factors

Item Type:	Article
Impact Factor Value:	0.303
Subjects:	Agricultural Sciences > Veterinary science
Divisions:	Faculty of Agriculture
Depositing User:	Dimitar Nakov
Date Deposited:	30 Jan 2023 10:10
Last Modified:	30 Jan 2023 10:10
URI:	https://eprints.ugd.edu.mk/id/eprint/30983

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