WeCAHN information library - Herd-level prevalence of bovine leukemia virus, Salmonella Dublin and Neospora caninum in Alberta, Canada, dairy herds using ELISA on bulk tank milk samples

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Dairy:

Dairy

Animal Type:

Bovine

Disease Agent:

Bovine leukemia virus;
Salmonella Dublin

Disease Agent Type:

Bacteria;
Protozoan;
Virus

Region:

Alberta

Production System:

Commercial, large-scale

Media Type:

Scientific publication

Link to article preprint

Herd-level prevalence of bovine leukemia virus, Salmonella Dublin and Neospora caninum in Alberta, Canada, dairy herds using ELISA on bulk tank milk samples

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PREPRINT

Study of bulk tank milk samples from 495 Albertan farms to estimate in-herd prevalences of Bovine leukemia virus (BLV), Salmonella Dublin and Neospora caninum using ELISA. Sampling occurred 4 times: December 2021, April, July, and October 2022. The study used a mixed-effect model to examine associations between prevalence and region, herd size, herd type, and milking system.

	ELISA target	Dec.2021	April 2022	July 2022	Oct.2022
no. farms		489	487	487	480
herd-level apparent prevalence	BLV	89.4%	88.7%	86.9%	86.9%
	Salmonella Dublin	11.2%	6.6%	8.6%	8.5%
	N. caninum	18.2%	7.4%	7.8%	15.0%

summary	BLV	Salmonella Dublin	N. caninum
herds positive at least once (4 samples)	91.7%	15.6%	28.1%
herds positive all samples (n=4)	82.5%	3.6%	3.0%

The results were an expected high BLV herd prevalence and unexpectedly high Salmonella Dublin and N. caninum herd prevalences.

https://doi.org/10.3168/jds.2023-24611