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Open AccessArticle

The Effect of Mycobacterium avium subsp. Paratuberculosis Infection on the Productivity of Cows in Two Dairy Herds with a Low Seroprevalence of Paratuberculosis

1
Departament of Veterinary Public Health, Faculty of Veterinary Medicine, University of Warmia and Mazury, Oczapowskiego 14, 10-718 Olsztyn, Poland
2
Voivodship Veterinary Nnspectorate in Olsztyn, Szarych Szeregów 7, 10-072 Olsztyn, Poland
3
Municipal Polyclinical Hospital in Olsztyn, Niepodległości 44, 10-045 Olsztyn, Poland
*
Author to whom correspondence should be addressed.
Animals 2020, 10(3), 490; https://doi.org/10.3390/ani10030490
Received: 31 January 2020 / Revised: 9 March 2020 / Accepted: 9 March 2020 / Published: 15 March 2020
(This article belongs to the Special Issue Infectious Diseases in Domestic and Wild Ruminants)
Paratuberculosis is a chronic, progressive enteritis of ruminants, caused by Mycobacterium avium subspecies paratuberculosis. It affects the productivity of infected dairy cows, causing a reduction in the daily milk yield and basic milk components. The aim of the study was to determine the effect of Mycobacterium avium subspecies paratuberculosis on the productivity of dairy cows in naturally infected herds with different seroprevalences of paratuberculosis. A decrease in milk yield was observed in cows in herds with a higher seroprevalence. The largest decrease in milk yield and basic milk components was observed in older animals.
Paratuberculosis is a chronic, progressive enteritis of ruminants, caused by Mycobacterium avium subspecies paratuberculosis. It affects the productivity of infected dairy cows, causing a reduction in the daily milk yield and basic milk components. The aim of the study was to determine the effect of Mycobacterium avium subspecies paratuberculosis on the productivity of dairy cows in two herds. The research materials were serum and milk samples taken from cows from two naturally infected dairy herds. All serum samples were serologically tested using the Mycobacterium paratuberculosis Antibody ELISA Kit by IDEXX—Screening and Verification. Seroprevalence differed between the herds (5.7% and 11.3%). Seroprevalence varied also between the groups of lactation. The highest seroprevalence was found in the first lactation group in both herds. The milk yield evaluation and analysis of the basic milk components’ content (protein and fat total solids) were tested once a month during one lactation period. The content of the basic milk components varied depending on the lactation group, as well as the serological status of the cows. A decrease in milk yield was observed in cows in herds with a higher seroprevalence (>11%). The largest decrease in milk yield and basic milk components was observed in older animals (>three lactations). View Full-Text
Keywords: Mycobacterium paratuberculosis; milk yield; milk composition; paratuberculosis Mycobacterium paratuberculosis; milk yield; milk composition; paratuberculosis
MDPI and ACS Style

Wiszniewska-Łaszczych, A.; Liedtke, K.G.; Szteyn, J.M.; Lachowicz, T. The Effect of Mycobacterium avium subsp. Paratuberculosis Infection on the Productivity of Cows in Two Dairy Herds with a Low Seroprevalence of Paratuberculosis. Animals 2020, 10, 490.

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