SIERRA VISTA, Ariz. (AP) _ Voters have overwhelmingly turned down a measure that would have stopped the Sierra Vista pound from donating dogs and cats for use in medical experiments at the University of Arizona.

Proposition 200 was defeated Tuesday by an unofficial vote count of 2,285 to 1,057, city officials said.

The southeastern Arizona city's animal shelter donates about 600 dogs and cats a year to the university.

Supporters of the proposed ban had argued during the campaign that the experiments often are painful, that the animals might be treated inhumanely and that the experiments many times do not have any relevance to human medical needs.

University officials said about 90 percent of the 700 dogs and cats that the school uses each year for medical research are donated by the Sierra Vista pound. The loss of those animals would jeopardize research and teaching efforts, school officials argued.

In November, the university released a poll showing that more than two- thirds of Arizona's residents support the use of live animals for medical research.