Studies on the epidemiology of bovine leukemia.
Characteristics of a female bovine population for a 19-county area of Michigan are defined. Cases of bovine leukemia in dairy cattle for this area are reported for the years 1962-65. The reported annual leukemia incidence for female Holstein cattle is 19 per 100,000. Reliable incidence rates could not be computed for the other four dairy breeds, since they comprised only 11 percent (approximately 50,000) of the dairy cattle population. An age-specific incidence graph shows a rather consistent increase in incidence as age advances, reaching 36 cases per 100,000 Holstein animals 8 years of age and over. The evidence indicates that size of herd has an influence on the incidence rate of leukemia--the rate being higher in large herds than in small.
Conner
G H
GH
College of Veterinary Medicine, Michigan State University, East Lansing, Michigan, USA.
LaBelle
J A
JA
Langham
R F
RF
Crittenden
M
M
D000367:Age Factors; D000822:Animal Husbandry; D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology*; D005260:Female; D015994:Incidence; D007938:Leukemia / Q000453:epidemiology / Q000662:veterinary*; D008297:Male; D008824:Michigan / Q000453:epidemiology