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Please use this identifier to cite or link to this item: http://hdl.handle.net/11019/289

Title: Paratuberculosis sero-status and milk production, SCC and calving interval in Irish dairy herds
Authors: Hoogendam, K
Richardson, E
Mee, John F
Keywords: Paratuberculosis sero-status
Irish dairy herd
Economic breeding index
Estimated breeding value
Issue Date: 1-Apr-2009
Publisher: Biomed Central
Citation: Irish Veterinary Journal. 2009 Apr 01;62(Suppl 4):265-271
Series/Report no.: Irish Veterinary Journal
Abstract: The objective of this study was to investigate the impact of paratuberculosis sero-status on milk yield, fat, protein, somatic cell count and calving interval in Irish dairy herds. Serum from all animals over 12 months of age (n = 2,602) in 34 dairy herds was tested for antibodies to Mycobacterium avium subsp. paratuberculosis using an ELISA. Herds were categorised by sero-status into positive, non-negative and negative, where a positive herd contained two or more positive cows, a non-negative herd contained only one positive cow and a negative herd contained no positive cows. Data at animal, parity and herd-level were analysed by multiple regression using general linear models. Positive herds (mean herd size = 129 cows) and non-negative herds (81 cows) were larger than negative herds (72 cows) (P < 0.01). Negative herds had the highest economic breeding index (EBI), while positive herds had the highest estimated breeding value (EBV) for milk yield. There was no significant effect of paratuberculosis sero-status at animal, parity or herd-level on milk yield, milk fat or protein production, somatic cell count score (SCCS) or calving interval. Negative herds tended to have a lower SCCS than positive and nonnegative herds (P = 0.087). This study only examined the effects of paratuberculosis sero-status but did not examine the clinical effects of Johne's disease at the farm or dairy industry levels.
Description: peer-reviewed
URI: http://hdl.handle.net/11019/289
http://dx.doi.org/10.1186/2046-0481-62-4-265
Appears in Collections:Animal & Bioscience
Teagasc publications in Biomed Central

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