Cow and calf loss due to pine needle abortion (PNA) in cattle grazing foothill ranges having stands of ponderosa pine (Pinus ponderosa) continues to cause managerial, as well as economic problems, for many ranchers in South Dakota, Colorado, Idaho and California as well as many areas in Canada.
Number of Pages
South Dakota State University
Shue, D.; Granholm, N. H.; Kamstra, L. D.; and Attrep, K., "Pine Needle Abortion in Cattle: A Progress Report" (1982). South Dakota Cow-Calf Field Day Proceedings, 1982. 15.