Management factors related to Salmonella shedding by dairy heifers.
In a national survey of dairy operations with > or = 30 milking cows, fecal samples from 6861 preweaned dairy heifer calves on 1063 operations were tested for Salmonella. One hundred forty-five (2.1%) of the fecal samples from 79 (7.4%) of the farms tested positive for Salmonella. A multivariate logistic regression model revealed that medicated milk replacer and hay fed to dairy heifers from 24 h of age until weaning were associated with a reduced risk of Salmonella sheddings, as was calving in an individual animal area within a building.
Losinger
W C
WC
Center for Epidemiology, National Animal Health Monitoring Systems, USDA, Animal and Plant Health Inspection Service, Veterinary Services, Fort Collins, CO 80521, USA.
Wells
S J
SJ
Garber
L P
LP
Hurd
H S
HS
Thomas
L A
LA
D000821:Animal Feed; D000818:Animals; D000900:Anti-Bacterial Agents / Q000008:administration & dosage; D002417:Cattle / Q000382:microbiology*; D005243:Feces / Q000382:microbiology*; D005260:Female; D015999:Multivariate Analysis; D012475:Salmonella / Q000302:isolation & purification*; D014886:Weaning
D000900:Anti-Bacterial Agents