Parainfluenza-3 virus exposure of beef heifers prior to natural breeding
Call, J.W.; Smart, R.A.; Blake, J.T.; Butcher, J.E.; Shupe, J.L.
American Journal of Veterinary Research 39(3): 527-528
1978
ISSN/ISBN: 0002-9645 PMID: 205150 Document Number: 124457
Ninety-six Hereford heifers (approximately 7 months of age) were randomly divided into 2 equal groups and housed 1.6 km apart (with 2 replications in time, 1 year apart). At 15 months of age, 1 group/replicate was inoculated with parainfluenza-3 virus, and the other group was given virus-free spent culture medium. Twenty-four hours later, 2 virgin bulls (2 years old) were placed with each group (24 cows) for natural breeding. Viral inoculation caused a twofold increase in parainfluenza-3 titer and a 0.3 C body temperature increase. There was no effect recognized from the virus on natural breeding efficiency.