Estimate of the direct production losses in Canadian dairy herds with subclinical Mycobacterium avium subspecies paratuberculosis infection.
The objective of this study was to estimate the annual losses from Mycobacterium avium subspecies paratuberculosis (MAP) for an average, MAP-seropositive, Canadian dairy herd. A partial-budget simulation model was developed with 4 components of direct production losses (decreased milk production, premature voluntary culling, mortality, and reproductive losses). Input values were obtained primarily from a national seroprevalence survey of 373 Canadian dairy farms in 8 of 10 provinces. The model took into account the variability and uncertainty of the required input values; consequently, it produced probability distributions of the estimated losses. For an average Canadian dairy herd with 12.7% of 61 cows seropositive for MAP, the mean loss was $2992 (95% C.I., $143 to $9741) annually, or $49 per cow per year. Additional culling, decreased milk production, mortality, and reproductive losses accounted for 46%, 9%, 16%, and 29% of the losses, respectively. Canadian dairy producers should use best management practices to reduce these substantial annual losses.
Tiwari
Ashwani
A
Department of Health Management, Atlantic Veterinary College, University of Prince Edward Island, 550, University Ave, Charlottetown, Prince Edward Island.
VanLeeuwen
John A
JA
Dohoo
Ian R
IR
Keefe
Greg P
GP
Weersink
Alfons
A
D000034:Abortion, Veterinary / Q000382:microbiology; D000818:Animals; D000907:Antibodies, Bacterial / Q000097:blood; D002417:Cattle; D002418:Cattle Diseases / Q000382:microbiology* / Q000401:mortality; D003198:Computer Simulation; D003365:Costs and Cost Analysis; D003612:Dairying / Q000191:economics* / Q000592:standards; D005260:Female; D007774:Lactation; D008892:Milk / Q000378:metabolism / Q000382:microbiology; D016927:Mycobacterium avium subsp. paratuberculosis / Q000276:immunology / Q000302:isolation & purification; D010283:Paratuberculosis / Q000150:complications* / Q000453:epidemiology / Q000382:microbiology* / Q000401:mortality; D011247:Pregnancy; D012098:Reproduction; D016036:Seroepidemiologic Studies; D016019:Survival Analysis
D000907:Antibodies, Bacterial