How fast can one expect to see a reduction in herd size?
There is no simple answer to this question. The time required will depend on the variables such as rates of reproduction, mortality, immigration and emigration, disease, weather, quality of the habitat, etc. In 2005 deer densities in Kismet-Lonelyville ,the most heavily treated area on Fire Island, were 55 percent of whqt they had been in 1995 when surveys were first started according to Allen Rutberg, Ph.D. At the National Institute of Standards and Technology (NIST) in Gaithersburg, Maryland, there has been a 20% reduction in deer after 3-4 years of PZP immunocontraception.
