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Contraception program effectively manages bison population

Date:
December 18, 2013
Source:
Santa Catalina Island Conservancy
Summary:
A new study reports that a contraception program proved effective in managing a bison herd's numbers. Previously, more than two-thirds of the cows delivered calves every year. After receiving the contraceptive, the calving rate dropped to 10.4 percent in the first year and 3.3 percent the following year.

Fourteen bison were brought to Catalina Island on Christmas Eve in 1924. Today the herd is successfully managed to a population around 150 with a contraceptive.
Credit: Jack Baldelli, courtesy Catalina Island Conservancy

The wild bison roaming Catalina Island are a major attraction for the nearly 1 million tourists who visit the Channel Island's most popular destination every year. But managing the number of bison so that the herd remains healthy and doesn't endanger the health of the rest of the Island has been a major challenge for wildlife biologists.

A new study by the Catalina Island Conservancy scientists, published in the December supplement of the Journal of Zoo and Wildlife Medicine, reports that the Conservancy's contraception program proved effective in managing the herd's numbers. Previously, more than two-thirds of the cows delivered calves every year. After receiving the contraceptive, the calving rate dropped to 10.4% in the first year and 3.3% the following year.

The Conservancy's study demonstrated for the first time that this type of contraceptive will work in a wild herd, a finding that can help improve bison management programs throughout the United States.

"The success of the Catalina Island Conservancy's bison contraception program demonstrates the innovative approaches our scientists undertake in fulfilling our commitment to being responsible stewards of the land and the Island's resources," said Ann Muscat, Catalina Island Conservancy president and chief executive officer. "By proving the effectiveness of this humane approach to herd management, this research will be a benefit to bison herds throughout the U.S. It also lays the groundwork for further contraceptive studies in other wild species."

The bison were first brought to the Island in 1924 for a movie. Over the years, they became an iconic symbol of the Island's culture. But with no natural predators, the herd grew to some 600 animals. The Catalina Island Conservancy, which protects 88% of Catalina Island, had previously conducted studies that found the Island could support only about 150 to 200 bison. To control the herd's size, the Conservancy had been periodically conducting roundups and shipping bison to the mainland.

"Shipping the bison to the mainland was costly, and it raised concerns about the stress on the animals during shipment and the expansion of the herd beyond ecologically sustainable numbers between shipments," said Julie King, director of conservation and wildlife management and a co-author of the contraception study. "We launched the contraceptive program because it is a humane and cost-effective solution to managing the herd and protecting the Island's resources."

Beginning in 2009, the Conservancy's scientists injected the female bison with porcine zona pellucida (PZP), a contraceptive that had been used for fertility control in zoos, wild horses and white tail deer. In addition to substantially reducing the number of new calves, the PZP had no apparent effect on pregnant females or their offspring. The Conservancy's scientists continue to study PZP to determine if the female bison can regain their fertility after a period of time without the contraceptive.

"The bison contraception program is a good example of trying to reach a balance with cultural, aesthetic or recreational needs and uses and cost-effective natural resource management to maintain the health of the ecosystem," said John J. Mack, chief conservation and education officer. "Because humans have been living and changing the Island for thousands of years, the Conservancy is always seeking new approaches to ensuring the long-term use and ecological health of Catalina Island."


Story Source:

The above story is based on materials provided by Santa Catalina Island Conservancy. Note: Materials may be edited for content and length.


Cite This Page:

Santa Catalina Island Conservancy. "Contraception program effectively manages bison population." ScienceDaily. ScienceDaily, 18 December 2013. <www.sciencedaily.com/releases/2013/12/131218152609.htm>.
Santa Catalina Island Conservancy. (2013, December 18). Contraception program effectively manages bison population. ScienceDaily. Retrieved September 23, 2014 from www.sciencedaily.com/releases/2013/12/131218152609.htm
Santa Catalina Island Conservancy. "Contraception program effectively manages bison population." ScienceDaily. www.sciencedaily.com/releases/2013/12/131218152609.htm (accessed September 23, 2014).

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