The effect of vaccination against Leptospira interrogans serovar hardjo infection at the time of service on pregnancy rates in dairy cows.
Fertility data from 16 dairy herds vaccinated against hardjo infection were used to assess pregnancy rates in cattle vaccinated around the day of mating. There was no improvement in pregnancy rates 30-60 d after vaccination. Pregnancy rates in the period 5 d before and 10 d after vaccination were statistically lower than those found in 30-60 d around vaccination.
Department of Veterinary Clinical Science and Animal Husbandry, University of Liverpool, Leahurst, Neston, South Wirral, UK.
G S
GS
Dhaliwal
R D
RD
Murray
D Y
DY
Downham
H
H
Dobson
D000818:Animals; D001428:Bacterial Vaccines; D002417:Cattle; D002418:Cattle Diseases / Q000517:prevention & control*; D005260:Female; D005298:Fertility; D007117:Immunization, Secondary / Q000662:veterinary; D007921:Leptospira interrogans / Q000276:immunology*; D007922:Leptospirosis / Q000517:prevention & control / Q000662:veterinary*; D011247:Pregnancy; D011270:Pregnancy, Animal; D014611:Vaccination / Q000662:veterinary
D001428:Bacterial Vaccines