Animal testing and vivisection - should it be allowed?

A pregnant cat pulled out of the Davis County animal shelter gave birth to eight kittens the very day she arrived at UU's laboratories. When the kittens were just 7 days old, a chemical was injected into their brains to cause fluid to build up. After the surgery, the distressed cat—who showed great affection for her kittens before they were taken for the experiment—stopped nursing her babies, and they all died.
In other experiments, a cat named Robert, who was also bought from the Davis County animal shelter, had a hole drilled into his skull and electrodes attached to his brain, and dogs bought from a local shelter had their necks cut open so that medical devices could be implanted inside.
Mice and rats were given enormous tumors and painful, deadly illnesses. Rats had holes drilled into their skulls for invasive brain experiments. Monkeys were kept constantly thirsty so that they would cooperate in experiments for a sip of water. Sick and injured animals were denied veterinary care and left to languish and die.
Incompetence, indifference, and neglect forced many of the animals to endure severe trauma, prolonged suffering, and agonizingly slow and grisly deaths.
Mice whose back legs were paralyzed, rats suffering epileptic seizures, and mice with huge ulcerated tumors covering their bodies were left to suffer.
A rabbit was left in a hallway without food or water for four days
PETA's investigator routinely found mice who had been allowed to die without any care.
Some animals had been dead for days, and their cagemates had to walk around their bodies to get to their food and water.
One monkey was kept in solitary confinement, caged alone in a room with no chance to interact with or even see others of his own kind.
Experimenters kept some monkeys constantly thirsty so that they would cooperate during experiments just to get a few drops of water.
In classroom experiments at Arizona State University, rabbits have holes cut into their necks, and they are injected with various drugs before being killed.
frogs have pins stuck through their skulls and are dissected alive, rats are placed in chambers in which the pressure is lowered until they are nearly unconscious, and cockroaches have their legs cut off
experiments by a concerned Bucknell University alumnus and found that for 30 years, Prof. Owen Floody has been drilling holes into the skulls of female hamsters, damaging their brains, and observing the injuries' effects on the hamsters' sexual behavior