https://youtu.be/4RiyCYbKPmg
Two rat mating couples can, over an 8 to 12 month life span, generate 15 million descendants. The mating couple guards their territory from neighboring tribes who would invade if there were a sudden drop in population, the cause of poison’s rebound effect. A new birth control for rodents, particularly rats, could soon be available. A company in the states will be selling the contraceptive as a pest control product. The bait, which is a sweet liquid, causes egg loss in female rats and impairs sperm development in males. The company also reports that female rats will also become sterilized for life if they drink enough of the bait. Their claim is that they developed a non-lethal treatment that has the potential to be more effective, more humane, and less invasive to the environment than traditional management methods. It takes up two weeks for the contraceptive to start causing declines in rat litter size. Their trials have shown that using the bait reduces population numbers by up to 40 percent. Testing continues to see how the formula might work on other animals, including dogs, cats, mice and wild hogs.
https://www.linkedin.com/pulse/rat-contraceptive-randy-bilesky?published=t
http://www.delta-optimist.com/opinion/blogs/blog-rat-contraceptive-1.2326985