title: Parainfluenza-3 virus exposure of beef heifers prior to natural breeding.
abstract: 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.
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis; D001947:Breeding; D002417:Cattle / Q000276:immunology / Q000502:physiology*; D005260:Female; D008297:Male; D010224:Parainfluenza Virus 3, Human / Q000276:immunology*; D011247:Pregnancy; D012098:Reproduction; D018108:Respirovirus / Q000276:immunology*
chemical_list: D000914:Antibodies, Viral